Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 1 20.  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)
 01/21/2021   18:22:00   (  68.54, -97.19) 01/21/2021   18:23:11  (  68.51, -97.03)    7.28                71
 01/21/2021   19:12:40   ( -68.34,  70.39) 01/21/2021   19:12:42  ( -68.35,  70.40)    0.55                 2
 01/21/2021   20:03:23   (  68.17,-122.08) 01/21/2021   20:02:10  (  68.18,-122.15)    3.00                73
 01/24/2021   10:38:53   (  68.42,  18.74) 01/24/2021   10:39:40  (  68.43,  18.75)    1.65                47
 01/24/2021   11:29:34   ( -68.27,-173.75) 01/24/2021   11:29:11  ( -68.27,-173.81)    2.53                23
 01/24/2021   12:20:01   (  67.23,  -5.17) 01/24/2021   12:18:54  (  67.26,  -7.32)   92.51                67
 01/27/2021   02:05:20   ( -69.37, -34.09) 01/27/2021   02:06:27  ( -69.30, -31.92)   85.40                67
 01/27/2021   02:55:47   (  68.35, 134.60) 01/27/2021   02:56:09  (  68.35, 134.53)    2.75                22
 01/27/2021   03:46:29   ( -68.25, -57.96) 01/27/2021   03:45:39  ( -68.25, -57.96)    0.64                50
 01/29/2021   18:21:58   ( -68.45,  82.93) 01/29/2021   18:23:10  ( -68.44,  82.87)    2.62                72
 01/29/2021   19:12:42   (  68.34,-109.62) 01/29/2021   19:12:37  (  68.32,-109.63)    2.34                 5
 01/29/2021   20:03:21   ( -68.08,  58.03) 01/29/2021   20:02:09  ( -68.11,  57.76)   12.02                72
 02/01/2021   10:38:52   ( -68.43,-161.28) 02/01/2021   10:39:37  ( -68.41,-161.28)    3.19                45
 02/01/2021   11:29:35   (  68.28,   6.23) 02/01/2021   11:29:04  (  68.28,   6.21)    1.12                31