Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 4 10.  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   (  68.48, -97.07) 04/11/2021   18:22:18  (  68.49, -97.10)    1.85                34
 04/11/2021   19:12:25   ( -68.35,  70.41) 04/11/2021   19:11:48  ( -68.38,  70.40)    3.06                37
 04/14/2021   09:48:02   ( -69.04,-149.35) 04/14/2021   09:49:13  ( -68.91,-148.35)   42.51                71
 04/14/2021   10:38:38   (  68.48,  18.71) 04/14/2021   10:38:46  (  68.46,  18.74)    2.44                 8
 04/14/2021   11:29:19   ( -68.35,-173.81) 04/14/2021   11:28:16  ( -68.35,-173.75)    2.35                63
 04/17/2021   02:04:46   ( -68.55, -32.93) 04/17/2021   02:05:46  ( -68.54, -32.92)    1.29                60
 04/17/2021   02:55:30   (  68.43, 134.55) 04/17/2021   02:55:13  (  68.43, 134.58)    1.29                17
 04/17/2021   03:46:02   ( -67.81, -57.35) 04/17/2021   03:44:51  ( -67.88, -58.44)   46.07                71
 04/19/2021   18:21:39   ( -68.50,  82.92) 04/19/2021   18:22:14  ( -68.51,  82.91)    0.74                35
 04/19/2021   19:12:23   (  68.38,-109.61) 04/19/2021   19:11:41  (  68.39,-109.59)    1.37                42
 04/22/2021   09:47:57   (  68.91,  30.83) 04/22/2021   09:49:08  (  68.79,  31.50)   30.43                71
 04/22/2021   10:38:32   ( -68.45,-161.24) 04/22/2021   10:38:42  ( -68.47,-161.26)    1.99                10
 04/22/2021   11:29:16   (  68.33,   6.23) 04/22/2021   11:28:09  (  68.34,   6.23)    1.39                67