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package Astro::Coords::Fixed; |
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=head1 NAME |
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Astro::Coords::Fixed - Manipulate coordinates that are fixed on the sky |
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=head1 SYNOPSIS |
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$c = new Astro::Coords::Fixed( az => 180, |
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el => 45, |
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units => 'degrees'); |
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$c = new Astro::Coords::Fixed( ha => '02:30:00.0', |
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dec => '45:30:03', |
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units => 'sexagesimal', |
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tel => $telescope, |
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); |
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=head1 DESCRIPTION |
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This subclass of C<Astro::Coords> allows for the manipulation |
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of coordinates that are fixed on the sky. Sometimes a telescope |
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should be commanded to go to a fixed location (eg for a calibration) |
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and this class puts those coordinates (Azimuth and elevation for telescopes |
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such as JCMT and Gemini and Hour Angle and Declination for equatorial |
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telescopes such as UKIRT) on the same footing as astronomical coordinates. |
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Note that Azimuth and elevation do not require the telescope latitude |
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whereas Hour Angle and declination does. |
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=cut |
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6688985
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use 5.006; |
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use strict; |
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use warnings; |
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use Carp; |
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our $VERSION = '0.21'; |
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1718
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use Astro::PAL (); |
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use Astro::Coords::Angle; |
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use base qw/ Astro::Coords /; |
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3711
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use overload '""' => "stringify"; |
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=head1 METHODS |
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=head2 Constructor |
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=over 4 |
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53
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=item B<new> |
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55
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Constructor. Recognizes hash keys "ha", "dec" and "az", "el". |
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57
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$c = new Astro::Coords::Fixed( az => 35, el => 30 ); |
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59
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$c = new Astro::Coords::Fixed( ha => $ha, dec => $dec, tel => $tel); |
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61
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Usually called via C<Astro::Coords> rather than directly. |
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63
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Note that the declination is equivalent to "Apparent Dec" used |
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elsewhere in these classes. |
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66
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Azimuth and Elevation is the internal format. Currently there is no |
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caching (so there is always overhead converting to apparent |
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RA and Dec) since there is no cache flushing when the telescope |
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is changed. |
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71
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A telescope is required (in the form of an C<Astro::Telescope> object) |
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if the position is specified as HA/Dec. |
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74
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A reference to a 2-element array can be given to specify different units |
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for the two coordinates, e.g. C<['hours', 'degrees']>. |
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77
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A name can be associated with this position. |
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=cut |
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81
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sub new { |
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13
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1
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29
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my $proto = shift; |
83
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my $class = ref($proto) || $proto; |
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85
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13
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40
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my %args = @_; |
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87
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# We will always calculate ha, dec, az and el |
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my ($az, $el); |
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90
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# Create a new object |
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30
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my $c = bless { }, $class; |
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93
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# Store the telescope if we have one |
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100
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45
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$c->telescope( $args{tel} ) if exists $args{tel}; |
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96
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100
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my ($unit_c1, $unit_c2) = (ref $args{'units'}) ? @{$args{'units'}} : ($args{'units'}) x 2; |
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97
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98
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13
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100
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66
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if (exists $args{ha} && exists $args{dec} and exists $args{tel} |
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33
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33
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33
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99
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and UNIVERSAL::isa($args{tel}, "Astro::Telescope")) { |
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# HA and Dec |
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102
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# Convert input args to radians |
103
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3
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14
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my $ha = Astro::Coords::Angle::Hour->to_radians($args{ha}, $unit_c1); |
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3
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11
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my $dec = Astro::Coords::Angle->to_radians($args{dec}, $unit_c2); |
105
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106
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# Convert to "native" format |
107
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3
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11
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my $lat = $args{tel}->lat; |
108
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3
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40
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($az, $el) = Astro::PAL::palDe2h( $ha, $dec, $lat ); |
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110
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3
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10
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$az = new Astro::Coords::Angle( $az, units => 'rad', range => '2PI'); |
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3
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8
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$el = new Astro::Coords::Angle( $el, units => 'rad'); |
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113
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# native form |
114
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3
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8
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$c->native( 'hadec' ); |
115
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116
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} elsif (exists $args{az} and exists $args{el}) { |
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# Az and El |
118
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119
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# Convert input args to radians |
120
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10
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49
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$az = new Astro::Coords::Angle( $args{az}, units => $unit_c1, |
121
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range => '2PI' ); |
122
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10
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51
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$el = new Astro::Coords::Angle( $args{el}, units => $unit_c2); |
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124
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# native form |
125
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10
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78
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$c->native( 'azel' ); |
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127
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} else { |
128
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0
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0
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return undef; |
129
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} |
130
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131
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# Store the name |
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13
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50
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42
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$c->name( $args{name} ) if exists $args{name}; |
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134
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# Store it in the object |
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13
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60
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$c->azel( $az, $el ); |
136
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137
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13
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57
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return $c; |
138
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} |
139
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140
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141
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=back |
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143
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=head2 Accessor Methods |
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145
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=over 4 |
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147
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=item B<azel> |
148
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149
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Return azimuth and elevation (as two C<Astro::Coords::Angle> objects); |
150
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151
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($az, $el) = $c->azel; |
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153
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Can also be used to store the azimuth and elevation |
154
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(as C<Astro::Coords::Angle> objects) |
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156
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$c->_azel( $az, $el); |
157
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158
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=cut |
159
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160
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sub azel { |
161
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37
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37
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1
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70
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my $self = shift; |
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37
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100
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74
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if (@_) { |
163
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32
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my ($az, $el) = @_; |
164
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13
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50
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59
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croak "Azimuth not an Astro::Coords::Angle object" |
165
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unless UNIVERSAL::isa( $az, "Astro::Coords::Angle"); |
166
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13
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50
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37
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croak "Elevation not an Astro::Coords::Angle object" |
167
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unless UNIVERSAL::isa( $el, "Astro::Coords::Angle"); |
168
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13
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27
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$self->{Az} = $az; |
169
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13
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26
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$self->{El} = $el; |
170
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} |
171
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37
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78
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return ($self->{Az}, $self->{El}); |
172
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} |
173
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174
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=back |
175
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176
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=head2 General Methods |
177
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178
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=over 4 |
179
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180
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=item B<type> |
181
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182
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Returns the generic type associated with the coordinate system. |
183
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For this class the answer is always "FIXED". |
184
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185
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This is used to aid construction of summary tables when using |
186
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mixed coordinates. |
187
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188
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=cut |
189
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190
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sub type { |
191
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2
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2
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1
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15
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return "FIXED"; |
192
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} |
193
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194
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=item B<stringify> |
195
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196
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Returns a string representation of the object. Returns |
197
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Azimth and Elevation in degrees. |
198
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199
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=cut |
200
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201
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sub stringify { |
202
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1
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1
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1
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18
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my $self = shift; |
203
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1
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9
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my $az = $self->az( format => "degrees" ); |
204
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1
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8
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my $el = $self->el( format => "degrees" ); |
205
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1
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46
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return "$az $el"; |
206
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} |
207
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208
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=item B<summary> |
209
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210
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Return a one line summary of the coordinates. |
211
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In the future will accept arguments to control output. |
212
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213
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$summary = $c->summary(); |
214
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215
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=cut |
216
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217
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|
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sub summary { |
218
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0
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|
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0
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1
|
0
|
my $self = shift; |
219
|
0
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|
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|
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0
|
my $name = $self->name; |
220
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0
|
0
|
|
|
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0
|
$name = '' unless defined $name; |
221
|
0
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|
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|
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0
|
return sprintf("%-16s %-12s %-13s AZEL",$name, |
222
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|
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|
$self->az(format=>"s"), |
223
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|
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$self->el(format =>"s")); |
224
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|
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|
} |
225
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226
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|
=item B<array> |
227
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228
|
|
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|
Array summarizing the object. Retuns |
229
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|
Return back 11 element array with first 3 elements being the |
230
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|
coordinate type (FIXED) and the az/el coordinates |
231
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(radians). |
232
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233
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This method returns a standardised set of elements across all |
234
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|
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|
types of coordinates. |
235
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|
236
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|
=cut |
237
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238
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|
sub array { |
239
|
1
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|
|
1
|
1
|
11
|
my $self = shift; |
240
|
1
|
|
|
|
|
5
|
my ($az, $el) = $self->azel(); |
241
|
1
|
|
|
|
|
4
|
return ( $self->type, $az->radians, $el->radians, |
242
|
|
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|
undef, undef, undef, undef, undef, undef, undef, undef); |
243
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|
} |
244
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|
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245
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|
=item B<ha> |
246
|
|
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|
|
|
|
|
247
|
|
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|
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|
|
Get the hour angle for the currently stored LST. By default |
248
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|
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|
returns format as for other angular methods. |
249
|
|
|
|
|
|
|
|
250
|
|
|
|
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|
|
$ha = $c->ha; |
251
|
|
|
|
|
|
|
$ha = $c->ha( format => "deg" ); |
252
|
|
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|
253
|
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|
=cut |
254
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|
255
|
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|
|
sub ha { |
256
|
3
|
|
|
3
|
1
|
1864
|
my $self = shift; |
257
|
3
|
|
|
|
|
10
|
my %opt = @_; |
258
|
3
|
|
|
|
|
10
|
my $ha = ($self->hadec)[0]; |
259
|
3
|
|
|
|
|
14
|
return $ha->in_format( $opt{format} ); |
260
|
|
|
|
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|
|
} |
261
|
|
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|
|
262
|
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|
|
=item B<apparent> |
263
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264
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|
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|
|
Return the apparent RA and Dec (as two C<Astro::Coords::Angle> objects) |
265
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|
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|
|
for the current time [note that the apparent declination |
266
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|
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|
|
|
|
is fixed and the apparent RA changes]. |
267
|
|
|
|
|
|
|
|
268
|
|
|
|
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|
|
If no telescope is present the equator is used. |
269
|
|
|
|
|
|
|
|
270
|
|
|
|
|
|
|
=cut |
271
|
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|
|
|
272
|
|
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|
|
|
|
sub apparent { |
273
|
4
|
|
|
4
|
1
|
8
|
my $self = shift; |
274
|
|
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|
|
|
|
|
275
|
4
|
|
|
|
|
14
|
my ($ra_app, $dec_app) = $self->_cache_read( "RA_APP", "DEC_APP" ); |
276
|
|
|
|
|
|
|
|
277
|
4
|
50
|
33
|
|
|
18
|
if (!defined $ra_app || !defined $dec_app) { |
278
|
|
|
|
|
|
|
|
279
|
4
|
|
|
|
|
14
|
(my $ha, $dec_app) = $self->hadec; |
280
|
4
|
|
|
|
|
21
|
$ra_app = $self->_lst - $ha->radians; |
281
|
4
|
|
|
|
|
18
|
$ra_app = new Astro::Coords::Angle::Hour( $ra_app, units => 'rad', range => '2PI' ); |
282
|
|
|
|
|
|
|
|
283
|
|
|
|
|
|
|
# should not cache the DEC_APP since we did not calculate it |
284
|
4
|
|
|
|
|
16
|
$self->_cache_write( "RA_APP" => $ra_app ); |
285
|
|
|
|
|
|
|
} |
286
|
|
|
|
|
|
|
|
287
|
4
|
|
|
|
|
12
|
return( $ra_app, $dec_app); |
288
|
|
|
|
|
|
|
} |
289
|
|
|
|
|
|
|
|
290
|
|
|
|
|
|
|
=item B<hadec> |
291
|
|
|
|
|
|
|
|
292
|
|
|
|
|
|
|
Return the Hour angle and apparent declination (as two C<Astro::Coords::Angle> objects). |
293
|
|
|
|
|
|
|
If no telescope is present the equator is used. |
294
|
|
|
|
|
|
|
|
295
|
|
|
|
|
|
|
($ha, $dec) = $c->hadec; |
296
|
|
|
|
|
|
|
|
297
|
|
|
|
|
|
|
=cut |
298
|
|
|
|
|
|
|
|
299
|
|
|
|
|
|
|
sub hadec { |
300
|
10
|
|
|
10
|
1
|
34
|
my $self = shift; |
301
|
|
|
|
|
|
|
|
302
|
10
|
|
|
|
|
32
|
my ($ha, $dec_app) = $self->_cache_read( "HA", "DEC_APP" ); |
303
|
|
|
|
|
|
|
|
304
|
10
|
100
|
66
|
|
|
39
|
if (!defined $ha || !defined $dec_app) { |
305
|
|
|
|
|
|
|
|
306
|
7
|
|
|
|
|
17
|
my ($az, $el) = $self->azel; |
307
|
7
|
|
|
|
|
21
|
my $tel = $self->telescope; |
308
|
7
|
50
|
|
|
|
33
|
my $lat = ( defined $tel ? $tel->lat : 0.0); |
309
|
|
|
|
|
|
|
|
310
|
|
|
|
|
|
|
# First need to get the hour angle and declination from the Az and El |
311
|
7
|
|
|
|
|
64
|
($ha, $dec_app) = Astro::PAL::palDh2e($az->radians, $el->radians, $lat ); |
312
|
|
|
|
|
|
|
|
313
|
7
|
|
|
|
|
28
|
$ha = new Astro::Coords::Angle::Hour( $ha, units => 'rad', range => 'PI'); |
314
|
7
|
|
|
|
|
33
|
$dec_app = new Astro::Coords::Angle( $dec_app, units => 'rad'); |
315
|
|
|
|
|
|
|
|
316
|
7
|
|
|
|
|
39
|
$self->_cache_write( "HA" => $ha, "DEC_APP" => $dec_app ); |
317
|
|
|
|
|
|
|
} |
318
|
|
|
|
|
|
|
|
319
|
10
|
|
|
|
|
35
|
return ($ha, $dec_app); |
320
|
|
|
|
|
|
|
} |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
=item B<ha_set> |
323
|
|
|
|
|
|
|
|
324
|
|
|
|
|
|
|
For a fixed source, the setting Hour Angle has no meaning. |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
=cut |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
sub ha_set { |
329
|
0
|
|
|
0
|
1
|
0
|
return (); |
330
|
|
|
|
|
|
|
} |
331
|
|
|
|
|
|
|
|
332
|
|
|
|
|
|
|
=item B<meridian_time> |
333
|
|
|
|
|
|
|
|
334
|
|
|
|
|
|
|
Meridian time is not defined for a fixed source. |
335
|
|
|
|
|
|
|
|
336
|
|
|
|
|
|
|
=cut |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
sub meridian_time { |
339
|
0
|
|
|
0
|
1
|
0
|
return (); |
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
=item B<transit_el> |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
Transit elevation is not defined for a fixed source. Always returns undef. |
345
|
|
|
|
|
|
|
|
346
|
|
|
|
|
|
|
=cut |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
sub transit_el { |
349
|
0
|
|
|
0
|
1
|
0
|
return (); |
350
|
|
|
|
|
|
|
} |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
=item B<apply_offset> |
353
|
|
|
|
|
|
|
|
354
|
|
|
|
|
|
|
Overrided method to prevent C<Astro::Coords::apply_offset> being |
355
|
|
|
|
|
|
|
called on this subclass. |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
=cut |
358
|
|
|
|
|
|
|
|
359
|
|
|
|
|
|
|
sub apply_offset { |
360
|
1
|
|
|
1
|
1
|
218
|
croak 'apply_offset: attempting to apply an offset to fixed coordinates'; |
361
|
|
|
|
|
|
|
} |
362
|
|
|
|
|
|
|
|
363
|
|
|
|
|
|
|
=back |
364
|
|
|
|
|
|
|
|
365
|
|
|
|
|
|
|
=head1 NOTES |
366
|
|
|
|
|
|
|
|
367
|
|
|
|
|
|
|
Usually called via C<Astro::Coords>. |
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
=head1 REQUIREMENTS |
370
|
|
|
|
|
|
|
|
371
|
|
|
|
|
|
|
C<Astro::PAL> is used for all internal astrometric calculations. |
372
|
|
|
|
|
|
|
|
373
|
|
|
|
|
|
|
=head1 AUTHOR |
374
|
|
|
|
|
|
|
|
375
|
|
|
|
|
|
|
Tim Jenness E<lt>tjenness@cpan.orgE<gt> |
376
|
|
|
|
|
|
|
|
377
|
|
|
|
|
|
|
=head1 COPYRIGHT |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
Copyright (C) 2001-2005 Particle Physics and Astronomy Research Council. |
380
|
|
|
|
|
|
|
All Rights Reserved. |
381
|
|
|
|
|
|
|
|
382
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify it under |
383
|
|
|
|
|
|
|
the terms of the GNU General Public License as published by the Free Software |
384
|
|
|
|
|
|
|
Foundation; either version 3 of the License, or (at your option) any later |
385
|
|
|
|
|
|
|
version. |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
This program is distributed in the hope that it will be useful,but WITHOUT ANY |
388
|
|
|
|
|
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A |
389
|
|
|
|
|
|
|
PARTICULAR PURPOSE. See the GNU General Public License for more details. |
390
|
|
|
|
|
|
|
|
391
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License along with |
392
|
|
|
|
|
|
|
this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
393
|
|
|
|
|
|
|
Place,Suite 330, Boston, MA 02111-1307, USA |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
=cut |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
1; |