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#!/usr/bin/env python3
#
# Copyright (c) 2017 Aaron LI <aly@aaronly.me>
# MIT License
#
"""
Convert among various (R.A., Dec.) coordinate formats.
"""
import argparse
from astropy import units as au
from astropy.coordinates import Angle
def parse_coord(c):
if len(c) == 6:
# h m s d m s
ra = Angle((float(c[0]), float(c[1]), float(c[2])), unit=au.hourangle)
dec = Angle((float(c[3]), float(c[4]), float(c[5])), unit=au.deg)
elif len(c) == 2:
ra = Angle(float(c[0]), unit=au.deg)
dec = Angle(float(c[1]), unit=au.deg)
else:
raise ValueError("invalid coordinate: {0}".format(c))
return (ra, dec)
def main():
parser = argparse.ArgumentParser(
description="Convert among multiple coordinate formats")
parser.add_argument("coord", nargs="+")
args = parser.parse_args()
ra, dec = parse_coord(args.coord)
info = (
"%-14s %-14s\n" % ("R.A.", "Dec.") +
"%s--%s\n" % ("-"*14, "-"*14) +
"%-14.3f %-+14.3f\n" % (ra.deg, dec.deg) +
"%-14s %-14s\n" % (
ra.to_string(unit=au.hourangle, precision=4),
dec.to_string(unit=au.deg, alwayssign=True, precision=3)) +
"%-14s %-14s\n" % (
ra.to_string(unit=au.hourangle, sep=":", precision=4),
dec.to_string(unit=au.deg, alwayssign=True,
sep=":", precision=3)) +
"%-14s %-14s\n" % (
ra.to_string(unit=au.hourangle, sep=" ", precision=4),
dec.to_string(unit=au.deg, alwayssign=True,
sep=" ", precision=3))
)
print(info)
if __name__ == "__main__":
main()
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