Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 3 18.  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)
 03/19/2021   14:41:39   ( -70.41, 136.37) 03/19/2021   14:40:27  ( -70.49, 135.49)   33.79                72
 03/19/2021   15:31:11   (  70.03, -56.53) 03/19/2021   15:31:05  (  70.05, -56.51)    2.21                 6
 03/19/2021   16:20:41   ( -69.92, 110.95) 03/19/2021   16:21:46  ( -69.92, 111.01)    2.32                65
 03/22/2021   06:58:13   ( -70.12,-108.17) 03/22/2021   06:57:14  ( -70.10,-108.12)    2.91                59
 03/22/2021   07:47:40   (  70.02,  59.32) 03/22/2021   07:47:59  (  70.03,  59.30)    2.00                19
 03/22/2021   08:37:21   ( -69.30,-134.02) 03/22/2021   08:38:29  ( -69.32,-132.34)   66.08                68
 03/24/2021   23:14:42   ( -70.10,   7.68) 03/24/2021   23:14:08  ( -70.08,   7.68)    2.35                34
 03/25/2021   00:04:09   (  69.99, 175.17) 03/25/2021   00:04:53  (  70.01, 175.10)    3.49                44
 03/27/2021   14:41:37   (  70.40, -43.65) 03/27/2021   14:40:26  (  70.47, -44.46)   31.09                71
 03/27/2021   15:31:11   ( -70.08, 123.52) 03/27/2021   15:31:02  ( -70.07, 123.48)    2.11                 9
 03/27/2021   16:20:38   (  69.97, -69.00) 03/27/2021   16:21:46  (  69.95, -69.03)    2.48                68
 03/30/2021   06:58:09   (  70.15,  71.86) 03/30/2021   06:57:13  (  70.14,  71.83)    1.84                56
 03/30/2021   07:47:39   ( -70.05,-120.64) 03/30/2021   07:47:55  ( -70.05,-120.72)    2.89                16
 03/30/2021   08:37:19   (  69.22,  45.87) 03/30/2021   08:38:26  (  69.24,  47.77)   75.17                67