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solarDistanceComputation.py
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solarDistanceComputation.py
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#!/usr/bin/env python3
#
# -*- coding: utf-8 -*-
#
# Copyright (C) 2019 CS Systèmes d'Information (CS SI)
#
# This file is part of the "Calceph Earth-Sun distance" project
#
# https://github.com/CS-SI/calceph_earth-sun_distance
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import math
import argparse
from calcephpy import CalcephBin, Constants
def to_julian_date(year, month, day, hour, minute, second):
a = (14 - month) / 12
y = year + 4800 - a
m = month + 12 * a - 3
julian_date = day + (153 * m + 2) / 5 + 365 * y + y / 4 - y / 100 + y / 400 - 32045
# float division
julian_date += (hour - 12) / 24. + minute / 1440. + second / 86400.
return julian_date
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description='''solarDistanceComputation script help section. ''')
parser.add_argument('ephemeris_files', type=str, nargs='+', help='Paths to the ephemeris files to use. They must '
'be compatible with the calceph library. (see '
'https://www.imcce.fr/content/medias/recherche/'
'equipes/asd/calceph/html/python/calceph.multiple.'
'html#menu-calceph-open)')
parser.add_argument('year', type=int, help='Year at the moment of the acquisition.')
parser.add_argument('month', type=int, help='Month at the moment of the acquisition.')
parser.add_argument('day', type=int, help='Day at the moment of the acquisition.')
parser.add_argument('hour', type=int, help='Hour at the moment of the acquisition.')
parser.add_argument('minute', type=int, help='Minute at the moment of the acquisition.')
parser.add_argument('second', type=int, help='Second at the moment of the acquisition.')
args = parser.parse_args()
if (args.month < 1) or (args.month > 12):
raise Exception('month must be between 1 and 12.')
if (args.day < 1) or (args.day > 31):
raise Exception('day must be between 1 and 31.')
if (args.hour < 0) or (args.hour > 23):
raise Exception('hour must be between 0 and 23.')
if (args.minute < 0) or (args.minute > 59):
raise Exception('minute must be between 0 and 59.')
if (args.second < 0) or (args.second > 59):
raise Exception('second must be between 0 and 59.')
print('Computing Earth/Sun distance the {y}/{m}/{d} at {h} h {mn} mn {s} s.'
.format(y=args.year, m=args.month, d=args.day, h=args.hour, mn=args.minute, s=args.second))
# compute julian date
cur_julian_date = to_julian_date(args.year, args.month, args.day, args.hour, args.minute, args.second)
julian_date_ent = int(cur_julian_date)
julian_date_dec = cur_julian_date - julian_date_ent
print('Corresponding julian date is {}.'.format(cur_julian_date))
# open ephemeris file
try:
peph = CalcephBin.open(args.ephemeris_files)
except RuntimeError:
raise Exception('Cannot open ephemeris files')
# compute the cartesian position of the sun (target 11) in the geocentric (center 3) referential
try:
out = peph.compute_unit(julian_date_ent, julian_date_dec, 11, 3, Constants.UNIT_AU + Constants.UNIT_SEC)
except RuntimeError:
raise Exception('Cannot compute earth/sun distance')
# compute the distance (norm)
norm = math.sqrt(pow(out[0], 2.) + pow(out[1], 2.) + pow(out[2], 2.))
print('Earth/Sun distance is {var}.'.format(var=norm))
# close ephemeris file
peph.close()