1# -*- coding: utf-8 -*- 2 3import pkg_resources 4import numpy as np 5import skyfield 6from skyfield.api import load 7from skyfield.functions import load_bundled_npy 8 9def main(): 10 print('Skyfield version: {0}'.format(skyfield.__version__)) 11 print('jplephem version: {0}'.format(version_of('jplephem'))) 12 print('sgp4 version: {0}'.format(version_of('sgp4'))) 13 14 ts = load.timescale() 15 fmt = '%Y-%m-%d' 16 17 final_leap = (ts._leap_tai[-1] - 1) / (24 * 60 * 60) 18 print('Built-in leap seconds table ends with leap second at: {0}' 19 .format(ts.tai_jd(final_leap).utc_strftime())) 20 21 arrays = load_bundled_npy('iers.npz') 22 daily_tt = arrays['tt_jd_minus_arange'] 23 daily_tt += np.arange(len(daily_tt)) 24 start = ts.tt_jd(daily_tt[0]) 25 end = ts.tt_jd(daily_tt[-1]) 26 print('Built-in ∆T table from finals2000A.all covers: {0} to {1}' 27 .format(start.utc_strftime(fmt), end.utc_strftime(fmt))) 28 29def version_of(distribution): 30 try: 31 d = pkg_resources.get_distribution(distribution) 32 except pkg_resources.DistributionNotFound: 33 return 'Unknown' 34 else: 35 return d.version 36 37main() 38