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Ruby script to convert celestial coordinates.
#! /usr/local/bin/ruby
# coding: utf-8
#---------------------------------------------------------------------------------
#= 赤道・黄道座標変換
#
# date name version
# 2016.08.29 mk-mode.com 1.00 新規作成
#
# Copyright(C) 2016 mk-mode.com All Rights Reserved.
#---------------------------------------------------------------------------------
#++
require "mk_coord"
class CoordConversion
# 黄道傾斜角(単位: rad)
# (Math::PI は MkCoord::Const::PI と置き換えてもよい)
EPS = 23.43929 * Math::PI / 180.0
# 元の赤道直交座標
POS = [
0.99443659220700997281,
-0.03816291768957833647,
-0.01655177670960058384
] # <= ある日の地球重心から見た太陽重心の位置(単位: AU)
def exec
puts "元の赤道直交座標:\n #{POS}"
rect_ec = MkCoord.rect_eq2ec(POS, EPS)
puts "黄道直交座標に変換:\n #{rect_ec}"
rect_eq = MkCoord.rect_ec2eq(rect_ec, EPS)
puts "赤道直交座標に戻す:\n #{rect_eq}"
*pol_eq, r = MkCoord.rect2pol(rect_eq)
puts "赤道極座標に変換:\n #{pol_eq[0, 2]} (R = #{r})"
pol_ec = MkCoord.pol_eq2ec(pol_eq[0, 2], EPS)
puts "黄道極座標に変換:\n #{pol_ec[0, 2]}"
pol_eq = MkCoord.pol_ec2eq(pol_ec, EPS)
puts "赤道極座標に戻す:\n #{pol_eq[0, 2]}"
rect_eq = MkCoord.pol2rect(pol_eq[0, 2], r)
puts "赤道直交座標に戻す:\n #{rect_eq}"
rescue => e
puts "[#{e.class}] #{e.message}"
e.backtrace.each { |tr| $stderr.puts "\t#{tr}" }
exit 1
end
end
CoordConversion.new.exec if __FILE__ == $0
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