Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 6 27.  Predictions up to the next  14.0 days:

     Date     Time(NPP) NPP Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 06/28/2018   03:46:44   ( -68.34, -58.04) 06/28/2018   03:47:48  ( -68.35, -58.10)    2.50                64
 06/28/2018   04:37:29   (  68.26, 109.38) 06/28/2018   04:37:15  (  68.24, 109.41)    2.44                14
 06/28/2018   05:28:03   ( -67.76, -82.68) 06/28/2018   05:26:51  ( -67.80, -83.47)   33.54                72
 06/30/2018   20:03:38   ( -68.30,  57.79) 06/30/2018   20:04:18  ( -68.32,  57.74)    2.78                40
 06/30/2018   20:54:23   (  68.22,-134.80) 06/30/2018   20:53:45  (  68.20,-134.75)    2.51                38
 07/03/2018   11:30:01   (  68.93,   5.41) 07/03/2018   11:31:11  (  68.78,   6.54)   48.46                70
 07/03/2018   12:20:32   ( -68.26, 173.61) 07/03/2018   12:20:48  ( -68.29, 173.58)    3.02                16
 07/03/2018   13:11:17   (  68.18, -18.98) 07/03/2018   13:10:15  (  68.17, -18.92)    3.01                62
 07/06/2018   03:46:45   (  68.36, 121.95) 07/06/2018   03:47:48  (  68.34, 121.89)    2.79                63
 07/06/2018   04:37:26   ( -68.23, -70.56) 07/06/2018   04:37:18  ( -68.25, -70.59)    2.82                 8
 07/06/2018   05:28:02   (  67.72,  97.38) 07/06/2018   05:26:51  (  67.73,  96.45)   39.11                71
 07/08/2018   20:03:38   (  68.32,-122.23) 07/08/2018   20:04:16  (  68.35,-122.22)    3.31                38
 07/08/2018   20:54:19   ( -68.19,  45.26) 07/08/2018   20:53:47  ( -68.21,  45.24)    2.08                32