これは日々の作業を通して学んだことや毎日の生活で気づいたことをを記録しておく備忘録である。
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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で夜かどうか判定す るには以下のようにすればよいようでござる。太陽が地平線よりも上にあるの か、下にあるのかを調べてくれるようでござる。
#!/usr/pkg/bin/python3.9 # # Time-stamp: <2022/07/03 10:15:15 (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 = "daytime or nighttime at given location" 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') # is night? result_is_night = observer.is_night (datetime) # printing results if (result_is_night): print ("%s (UT) ==> %s" % (datetime, 'night-time') ) else: print ("%s (UT) ==> %s" % (datetime, 'day-time') )
実行してみると、以下のようになるでござる。
% ./astroplan_sample_01.py -h usage: astroplan_sample_01.py [-h] [-l LONGITUDE] [-b LATITUDE] [-a ALTITUDE] [-t DATETIME] daytime or nighttime at given location 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_01.py -t 2022-07-03T10:30:00 # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T10:30:00 # 2022-07-03T10:30:00.000 (UT) ==> day-time % ./astroplan_sample_01.py -t 2022-07-03T10:45:00 # # input parameters # # Location: # longitude = +121d11m12s # latitude = +24d58m12s # altitude = 151.6 m # Date/Time: # date/time (UT) = 2022-07-03T10:45:00 # 2022-07-03T10:45:00.000 (UT) ==> night-time