Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2020 12 19.  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)
 12/20/2020   18:22:06   (  69.07, -97.86) 12/20/2020   18:23:15  (  68.93, -96.48)   56.92                69
 12/20/2020   19:12:36   ( -68.35,  70.43) 12/20/2020   19:12:53  ( -68.38,  70.46)    3.21                17
 12/20/2020   20:03:20   (  68.22,-122.10) 12/20/2020   20:02:21  (  68.21,-122.09)    0.86                59
 12/23/2020   10:38:49   (  68.44,  18.76) 12/23/2020   10:39:52  (  68.42,  18.75)    2.76                63
 12/23/2020   11:29:30   ( -68.30,-173.74) 12/23/2020   11:29:22  ( -68.31,-173.74)    0.60                 8
 12/23/2020   12:20:07   (  67.80,  -5.80) 12/23/2020   12:18:55  (  67.86,  -6.62)   35.28                72
 12/26/2020   02:55:44   (  68.40, 134.58) 12/26/2020   02:56:21  (  68.39, 134.60)    1.13                37
 12/26/2020   03:46:25   ( -68.26, -57.92) 12/26/2020   03:45:52  ( -68.23, -57.95)    3.01                33
 12/28/2020   18:22:05   ( -69.01,  82.22) 12/28/2020   18:23:15  ( -68.93,  83.50)   51.92                70
 12/28/2020   19:12:39   (  68.36,-109.60) 12/28/2020   19:12:50  (  68.37,-109.55)    2.22                11
 12/28/2020   20:03:20   ( -68.22,  57.90) 12/28/2020   20:02:21  ( -68.21,  57.89)    0.74                59
 12/31/2020   10:38:50   ( -68.44,-161.25) 12/31/2020   10:39:52  ( -68.45,-161.21)    2.12                62
 12/31/2020   11:29:33   (  68.27,   6.28) 12/31/2020   11:29:20  (  68.28,   6.22)    2.38                13
 12/31/2020   12:20:08   ( -67.80, 174.19) 12/31/2020   12:18:56  ( -67.85, 173.35)   35.63                72