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from skyfield.api import Topos, load
TEL_AVIV = Topos('32.0853 N', '34.7817 E')
ISS = "ISS (ZARYA)"
class Predictions(object):
def __init__(self, lat, lng, tz="UTC", satellite=ISS):
self.lat = lat
self.lng = lng
self.tz = tz
self.satellite = satellite
def init_stations(self):
stations_url = 'http://celestrak.com/NORAD/elements/stations.txt'
return load.tle_file(stations_url)
def get_next_days_timescale(self, days=10):
ts = load.timescale()
t0 = ts.now()
t1 = ts.ut1_jd(t0.ut1 + days)
return t0, t1
def get_predictions(self, location=TEL_AVIV, satellite_name=ISS):
satellites = self.init_stations()
by_name = {sat.name: sat for sat in satellites}
satellite = by_name[satellite_name]
t0, t1 = self.get_next_days_timescale()
t, events = satellite.find_events(location, t0, t1, altitude_degrees=30.0)
print(t)
print(events)
for ti, event in zip(t, events):
name = ('rise above 30°', 'culminate', 'set below 30°')[event]
print(ti.utc_strftime('%Y %b %d %H:%M:%S'), name)
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