fix typo in test_astrometry.py

tests/test_astrometry.py

@@ -26,7 +26,8 @@ class TestAstrometry(unittest.TestCase):
         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(