Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 3 22.  Predictions up to the next  14.0 days:

     Date     Time(LANDSAT-8) LANDSAT-8 Lat/Lon Date Time(NPP) NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/22/2021   06:58:13   ( -70.11,-108.18) 03/22/2021   06:57:14  ( -70.11,-108.13)    1.99                59
 03/22/2021   07:47:40   (  70.01,  59.32) 03/22/2021   07:47:59  (  70.03,  59.29)    2.51                19
 03/22/2021   08:37:21   ( -69.29,-134.03) 03/22/2021   08:38:29  ( -69.32,-132.35)   66.11                68
 03/24/2021   23:14:42   ( -70.10,   7.67) 03/24/2021   23:14:08  ( -70.09,   7.67)    0.86                34
 03/25/2021   00:04:09   (  69.99, 175.16) 03/25/2021   00:04:52  (  69.96, 175.17)    3.20                43
 03/27/2021   14:41:37   (  70.40, -43.65) 03/27/2021   14:40:26  (  70.47, -44.46)   31.10                71
 03/27/2021   15:31:11   ( -70.07, 123.51) 03/27/2021   15:31:02  ( -70.07, 123.48)    1.34                 9
 03/27/2021   16:20:38   (  69.96, -69.00) 03/27/2021   16:21:46  (  69.95, -69.03)    2.21                68
 03/30/2021   06:58:10   (  70.15,  71.86) 03/30/2021   06:57:14  (  70.14,  71.83)    1.65                56
 03/30/2021   07:47:40   ( -70.05,-120.65) 03/30/2021   07:47:56  ( -70.06,-120.73)    2.95                16
 03/30/2021   08:37:20   (  69.21,  45.86) 03/30/2021   08:38:27  (  69.24,  47.77)   75.36                67
 04/01/2021   23:14:38   (  70.11,-172.32) 04/01/2021   23:14:07  (  70.13,-172.38)    3.11                31
 04/02/2021   00:04:08   ( -70.01,  -4.82) 04/02/2021   00:04:48  ( -69.99,  -4.85)    2.71                40
 04/04/2021   14:41:34   ( -70.52, 136.50) 04/04/2021   14:40:23  ( -70.55, 135.42)   40.21                71
 04/04/2021   15:31:07   (  70.07, -56.50) 04/04/2021   15:31:00  (  70.07, -56.51)    0.66                 7
 04/04/2021   16:20:37   ( -69.97, 111.00) 04/04/2021   16:21:42  ( -69.98, 110.94)    2.30                65