Using Pyephem to calculate ISS passes -


i'm trying calculate passes of number of space objects celestrak tle elements starting iss because can test against values spot station. have start setting observer:

self.home = ephem.observer() self.home.lat = '51.45' self.home.lon = '-2.58' self.elevation = 134.69

and i'm using function calculate passes etc 

    def nextpass(self,tle):       spob = ephem.readtle(tle[0],tle[1],tle[2])       spob.compute(self.home)       print('\n\n%s: altitude %4.1f deg, azimuth %5.1f deg' % (spob.name, self.deg2rad(spob.alt), self.deg2rad(spob.az) ) )       self.home.date = datetime.utcnow()       info = self.home.next_pass(spob)       print("%s = rise time: %s azimuth: %s" % (self.home.date,info[0], info[1]))

and deg2rad says on tin!

    def deg2rad(self,radians):       return radians * (180.0 / math.pi)

the tle retrieved today (28th jan) http://www.celestrak.com/norad/elements/ is

isstle = ['iss (zarya)             ',   '1 25544u 98067a   16028.60081312  .00014289  00000-0  21385-3 0  9994',   '2 25544  51.6413  39.1283 0006529  51.2720 308.9374 15.54305299983116', ]

currently output 

iss (zarya): altitude -68.0 deg, azimuth 241.6 deg 2016/1/28 20:14:11 = rise time: 2016/1/28 20:46:11 azimuth: 203:45:42.0

my question if run @ 2016/1/28 20:14:11 why not getting same spot station give next possible sighting:

tue feb 2, 7:38 pm  < 1 min 12° 10° above ssw   12° above ssw

i note altitude negative , expect positive if visible next reported rise time in february?

the altitude printing not altitude of moment of next pass, because calling spob.compute(self.home) whatever date , time happens current value of self.home.date. if want altitude print altitude of next pass, instead of arbitrary , likely-negative number, try using either altitude value returned among 6 return values of next_pass, or else careful set self.home.date time , date when satellite above horizon before calling compute() method satellite.


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