Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2020 12 18.  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)
 12/18/2020   03:46:25   (  68.28, 122.06) 12/18/2020   03:45:51  (  68.27, 122.10)    1.88                34
 12/20/2020   18:22:05   (  69.03, -97.80) 12/20/2020   18:23:15  (  68.92, -96.50)   53.27                70
 12/20/2020   19:12:36   ( -68.36,  70.42) 12/20/2020   19:12:53  ( -68.37,  70.45)    1.45                17
 12/20/2020   20:03:19   (  68.18,-122.04) 12/20/2020   20:02:21  (  68.20,-122.10)    3.58                58
 12/23/2020   10:38:50   (  68.45,  18.75) 12/23/2020   10:39:52  (  68.45,  18.80)    2.16                62
 12/23/2020   11:29:31   ( -68.31,-173.76) 12/23/2020   11:29:23  ( -68.29,-173.76)    2.49                 8
 12/23/2020   12:20:07   (  67.76,  -5.75) 12/23/2020   12:18:56  (  67.84,  -6.65)   38.90                71
 12/26/2020   02:55:43   (  68.36, 134.63) 12/26/2020   02:56:21  (  68.37, 134.57)    2.76                38
 12/26/2020   03:46:25   ( -68.27, -57.93) 12/26/2020   03:45:51  ( -68.27, -57.92)    0.84                34
 12/28/2020   18:22:05   ( -69.02,  82.20) 12/28/2020   18:23:15  ( -68.89,  83.46)   52.08                70
 12/28/2020   19:12:38   (  68.32,-109.55) 12/28/2020   19:12:50  (  68.33,-109.59)    2.08                12
 12/28/2020   20:03:20   ( -68.23,  57.89) 12/28/2020   20:02:20  ( -68.23,  57.92)    1.46                60
 12/31/2020   10:38:50   ( -68.45,-161.26) 12/31/2020   10:39:51  ( -68.46,-161.20)    2.78                61
 12/31/2020   11:29:33   (  68.29,   6.26) 12/31/2020   11:29:19  (  68.28,   6.23)    1.21                14
 12/31/2020   12:20:07   ( -67.76, 174.24) 12/31/2020   12:18:56  ( -67.80, 173.29)   39.99                71