1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
from skyfield.api import Topos, load
class Predictions(object):
ISS = "ISS (ZARYA)"
def __init__(self, lat, lng, altitude=30.0, tz="UTC", satellite=ISS):
self.lat = lat
self.lng = lng
self.altitude = altitude
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(self, days=10):
ts = load.timescale()
t0 = ts.now()
t1 = ts.ut1_jd(t0.ut1 + days)
return t0, t1
def get_location(self):
return Topos(latitude_degrees=self.lat, longitude_degrees=self.lng)
def get_satellite(self):
satellites = self.init_stations()
by_name = {sat.name: sat for sat in satellites}
return by_name[self.satellite]
def get_predictions(self):
satellite = self.get_satellite()
t0, t1 = self.get_next_days(days=10)
location = self.get_location()
t, events = satellite.find_events(
location, t0, t1, altitude_degrees=self.altitude
)
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)
|
