Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 2 17.  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)
 02/20/2021   02:05:08   (  68.71, 146.80) 02/20/2021   02:06:19  (  68.66, 147.28)   20.24                71
 02/20/2021   02:55:45   ( -68.36, -45.42) 02/20/2021   02:55:52  ( -68.39, -45.43)    3.05                 7
 02/20/2021   03:46:29   (  68.24, 122.05) 02/20/2021   03:45:20  (  68.21, 122.02)    2.62                69
 02/22/2021   18:21:57   (  68.45, -97.09) 02/22/2021   18:22:48  (  68.47, -97.07)    2.62                51
 02/22/2021   19:12:38   ( -68.31,  70.42) 02/22/2021   19:12:19  ( -68.31,  70.37)    2.02                19
 02/22/2021   20:03:07   (  67.38,-121.12) 02/22/2021   20:01:59  (  67.47,-122.96)   79.18                68
 02/25/2021   09:48:26   ( -69.54,-150.11) 02/25/2021   09:49:32  ( -69.46,-147.58)   98.89                66
 02/25/2021   10:38:51   (  68.41,  18.75) 02/25/2021   10:39:16  (  68.39,  18.72)    1.73                25
 02/25/2021   11:29:33   ( -68.32,-173.82) 02/25/2021   11:28:46  ( -68.29,-173.77)    3.15                47
 02/28/2021   02:05:03   ( -68.59, -33.03) 02/28/2021   02:06:15  ( -68.55, -32.86)    8.05                72
 02/28/2021   02:55:45   (  68.36, 134.57) 02/28/2021   02:55:43  (  68.37, 134.57)    0.59                 2
 02/28/2021   03:46:26   ( -68.22, -57.92) 02/28/2021   03:45:14  ( -68.21, -57.98)    2.62                72
 03/02/2021   18:21:55   ( -68.44,  82.94) 03/02/2021   18:22:43  ( -68.46,  82.92)    2.91                48
 03/02/2021   19:12:39   (  68.32,-109.60) 03/02/2021   19:12:10  (  68.33,-109.59)    1.64                29
 03/02/2021   20:03:03   ( -67.26,  59.02) 03/02/2021   20:01:56  ( -67.35,  56.91)   91.34                67