Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 4 15.  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)
 04/17/2021   02:04:46   ( -68.51, -32.88) 04/17/2021   02:05:47  ( -68.53, -32.94)    3.13                61
 04/17/2021   02:55:30   (  68.43, 134.54) 04/17/2021   02:55:13  (  68.42, 134.57)    2.23                17
 04/17/2021   03:46:02   ( -67.82, -57.37) 04/17/2021   03:44:51  ( -67.86, -58.45)   45.59                71
 04/19/2021   18:21:39   ( -68.52,  82.90) 04/19/2021   18:22:14  ( -68.49,  82.89)    2.90                35
 04/19/2021   19:12:23   (  68.39,-109.63) 04/19/2021   19:11:41  (  68.38,-109.60)    1.52                42
 04/22/2021   09:47:57   (  68.93,  30.81) 04/22/2021   09:49:07  (  68.83,  31.56)   31.87                70
 04/22/2021   10:38:32   ( -68.47,-161.26) 04/22/2021   10:38:42  ( -68.45,-161.28)    2.51                10
 04/22/2021   11:29:16   (  68.35,   6.21) 04/22/2021   11:28:09  (  68.33,   6.22)    1.59                67
 04/25/2021   02:04:44   (  68.57, 147.07) 04/25/2021   02:05:39  (  68.56, 147.09)    1.41                55
 04/25/2021   02:55:25   ( -68.43, -45.43) 04/25/2021   02:55:10  ( -68.40, -45.46)    3.20                15
 04/25/2021   03:45:57   (  67.66, 122.85) 04/25/2021   03:44:48  (  67.66, 121.32)   64.46                69
 04/27/2021   18:21:36   (  68.53, -97.10) 04/27/2021   18:22:06  (  68.50, -97.10)    3.26                30
 04/27/2021   19:12:17   ( -68.39,  70.40) 04/27/2021   19:11:36  ( -68.40,  70.42)    1.94                41