Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2021 1 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)
 01/19/2021   02:05:23   (  69.49, 145.73) 01/19/2021   02:06:29  (  69.35, 148.14)   95.64                66
 01/19/2021   02:55:46   ( -68.38, -45.43) 01/19/2021   02:56:14  ( -68.40, -45.41)    2.02                28
 01/19/2021   03:46:30   (  68.27, 122.03) 01/19/2021   03:45:42  (  68.23, 122.03)    3.52                48
 01/21/2021   18:22:00   (  68.51, -97.15) 01/21/2021   18:23:12  (  68.49, -97.06)    4.46                72
 01/21/2021   19:12:40   ( -68.31,  70.43) 01/21/2021   19:12:43  ( -68.33,  70.38)    2.99                 3
 01/21/2021   20:03:23   (  68.14,-122.05) 01/21/2021   20:02:11  (  68.16,-122.18)    5.79                72
 01/24/2021   10:38:52   (  68.39,  18.78) 01/24/2021   10:39:40  (  68.41,  18.73)    3.02                48
 01/24/2021   11:29:34   ( -68.29,-173.78) 01/24/2021   11:29:10  ( -68.31,-173.76)    1.84                24
 01/24/2021   12:20:00   (  67.21,  -5.14) 01/24/2021   12:18:53  (  67.29,  -7.28)   92.62                67
 01/27/2021   02:05:20   ( -69.40, -34.13) 01/27/2021   02:06:27  ( -69.28, -31.95)   86.62                67
 01/27/2021   02:55:47   (  68.38, 134.56) 01/27/2021   02:56:08  (  68.38, 134.57)    0.63                21
 01/27/2021   03:46:28   ( -68.23, -57.93) 01/27/2021   03:45:39  ( -68.23, -57.98)    2.27                49
 01/29/2021   18:21:58   ( -68.48,  82.89) 01/29/2021   18:23:09  ( -68.47,  82.92)    1.36                71
 01/29/2021   19:12:41   (  68.32,-109.59) 01/29/2021   19:12:36  (  68.35,-109.59)    3.08                 5
 01/29/2021   20:03:21   ( -68.11,  57.99) 01/29/2021   20:02:08  ( -68.14,  57.80)    8.70                73