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astroplan を使って、与えられた場所での与えられた時間に最も近い時間の日 の入りと日の出の時間を調べるには以下のようにすればよいようでござる。
#!/usr/pkg/bin/python3.9 # # Time-stamp: <2022/07/03 10:49:00 (CST) daisuke> # # importing argparse module import argparse # importing astropy module import astropy.units import astropy.time import astropy.coordinates # importing astroplan module import astroplan # units unit_m = astropy.units.m # constructing parser object desc = "finding sunset/sunrise time at given location nearest to given time" parser = argparse.ArgumentParser (description=desc) # adding arguments parser.add_argument ('-l', '--longitude', default='+121d11m12s', \ help='longitude of observing site in format "+121d11m12s"') parser.add_argument ('-b', '--latitude', default='+24d58m12s', \ help='latitude of observing site in format "+24d58m12s"') parser.add_argument ('-a', '--altitude', type=float, default=151.6, \ help='altitude above sea-level in metre') parser.add_argument ('-t', '--datetime', default='2000-01-01T12:00:00.000', \ help='date/time in UT in "YYYY-MM-DDThh:mm:ss.sss" format') # command-line argument analysis args = parser.parse_args () # input parameters site_lon = args.longitude site_lat = args.latitude site_alt = args.altitude * unit_m datetime_str = args.datetime # printing input parameters print ("#") print ("# input parameters") print ("#") print ("# Location:") print ("# longitude =", site_lon) print ("# latitude =", site_lat) print ("# altitude =", site_alt) print ("# Date/Time:") print ("# date/time (UT) =", datetime_str) print ("#") # location object location = astropy.coordinates.EarthLocation.from_geodetic \ (site_lon, site_lat, site_alt) # observer object observer = astroplan.Observer (location=location, name="observer", \ timezone="UTC") # time object datetime = astropy.time.Time (datetime_str, scale='utc') # sunset sunset = observer.sun_set_time (datetime, which="nearest") # sunrise sunrise = observer.sun_rise_time (datetime, which="nearest") # printing results print ("sunset time (UT) nearest to %s (UT)" % datetime) print (" JD = %s" % sunset) print (" = %s" % sunset.isot) print ("sunrise time (UT) nearest to %s (UT)" % datetime) print (" JD = %s" % sunrise) print (" = %s" % sunrise.isot)
実行してみると、以下のようになるでござる。
% ./astroplan_sample_04.py -h usage: astroplan_sample_04.py [-h] [-l LONGITUDE] [-b LATITUDE] [-a ALTITUDE] [-t DATETIME] finding sunset/sunrise time at given location nearest to given time optional arguments: -h, --help show this help message and exit -l LONGITUDE, --longitude LONGITUDE longitude of observing site in format "+121d11m12s" -b LATITUDE, --latitude LATITUDE latitude of observing site in format "+24d58m12s" -a ALTITUDE, --altitude ALTITUDE altitude above sea-level in metre -t DATETIME, --datetime DATETIME date/time in UT in "YYYY-MM-DDThh:mm:ss.sss" format % ./astroplan_sample_04.py -t 2022-07-03T16:00:00 # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T16:00:00 # sunset time (UT) nearest to 2022-07-03T16:00:00.000 (UT) JD = 2459763.947916772 = 2022-07-03T10:45:00.009 sunrise time (UT) nearest to 2022-07-03T16:00:00.000 (UT) JD = 2459764.3848835514 = 2022-07-03T21:14:13.939