Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 6 20.  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)
 06/22/2018   20:03:41   (  68.30,-122.23) 06/22/2018   20:04:15  (  68.32,-122.25)    2.46                34
 06/22/2018   20:54:22   ( -68.18,  45.24) 06/22/2018   20:53:46  ( -68.17,  45.20)    2.37                36
 06/25/2018   11:30:01   ( -68.93,-174.60) 06/25/2018   11:31:11  ( -68.81,-173.42)   49.32                70
 06/25/2018   12:20:35   (  68.26,  -6.41) 06/25/2018   12:20:46  (  68.24,  -6.47)    3.22                11
 06/25/2018   13:11:16   ( -68.14, 161.07) 06/25/2018   13:10:16  ( -68.14, 161.05)    1.30                60
 06/28/2018   03:46:45   ( -68.36, -58.06) 06/28/2018   03:47:49  ( -68.34, -58.13)    3.56                64
 06/28/2018   04:37:29   (  68.22, 109.42) 06/28/2018   04:37:16  (  68.21, 109.38)    2.05                13
 06/28/2018   05:28:03   ( -67.72, -82.63) 06/28/2018   05:26:52  ( -67.78, -83.50)   37.11                71
 06/30/2018   20:03:38   ( -68.32,  57.77) 06/30/2018   20:04:18  ( -68.31,  57.71)    2.52                40
 06/30/2018   20:54:22   (  68.19,-134.76) 06/30/2018   20:53:45  (  68.18,-134.79)    1.32                37
 07/03/2018   11:30:00   (  68.90,   5.45) 07/03/2018   11:31:10  (  68.81,   6.58)   46.13                70
 07/03/2018   12:20:32   ( -68.28, 173.59) 07/03/2018   12:20:48  ( -68.27, 173.55)    1.99                16
 07/03/2018   13:11:16   (  68.15, -18.94) 07/03/2018   13:10:15  (  68.14, -18.95)    1.07                61