fix typo in test_astrometry.py

        sat_vx = 0.13581745522969868

        sat_vy = 7.233066646238058

        sat_vz = -2.5770060087052116

        dt = datetime.utcfromtimestamp(Time(jdt, format='jd').unix)

        dt = datetime.utcfromtimestamp(

            Time(2461865.75468577, format='jd').unix)

        date_str = dt.date().isoformat()

        time_str = dt.time().isoformat()

        ra_arr, dec_arr = on_orbit_obs_position(