Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 4 9.  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)
 04/11/2021   18:21:44   (  68.50, -97.11) 04/11/2021   18:22:17  (  68.52, -97.06)    2.45                33
 04/11/2021   19:12:25   ( -68.38,  70.38) 04/11/2021   19:11:48  ( -68.35,  70.37)    2.68                37
 04/14/2021   09:48:02   ( -69.06,-149.39) 04/14/2021   09:49:12  ( -68.94,-148.31)   45.08                70
 04/14/2021   10:38:37   (  68.45,  18.74) 04/14/2021   10:38:46  (  68.43,  18.71)    2.17                 9
 04/14/2021   11:29:18   ( -68.32,-173.77) 04/14/2021   11:28:16  ( -68.33,-173.78)    0.90                62
 04/17/2021   02:04:46   ( -68.53, -32.89) 04/17/2021   02:05:47  ( -68.52, -32.95)    2.76                61
 04/17/2021   02:55:30   (  68.40, 134.58) 04/17/2021   02:55:14  (  68.40, 134.55)    1.33                16
 04/17/2021   03:46:03   ( -67.84, -57.39) 04/17/2021   03:44:52  ( -67.85, -58.46)   45.29                71
 04/19/2021   18:21:40   ( -68.53,  82.88) 04/19/2021   18:22:14  ( -68.54,  82.95)    2.89                34
 04/19/2021   19:12:23   (  68.35,-109.58) 04/19/2021   19:11:42  (  68.36,-109.62)    1.96                41
 04/22/2021   09:47:56   (  68.89,  30.86) 04/22/2021   09:49:07  (  68.82,  31.54)   28.52                71
 04/22/2021   10:38:32   ( -68.48,-161.28) 04/22/2021   10:38:41  ( -68.50,-161.22)    3.10                 9
 04/22/2021   11:29:15   (  68.31,   6.26) 04/22/2021   11:28:09  (  68.32,   6.21)    2.44                66