Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 3 19.  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, 136.36) 03/19/2021   14:40:27  ( -70.49, 135.49)   33.87                72
 03/19/2021   15:31:11   (  70.03, -56.53) 03/19/2021   15:31:05  (  70.05, -56.51)    2.14                 6
 03/19/2021   16:20:41   ( -69.92, 110.94) 03/19/2021   16:21:46  ( -69.92, 111.00)    2.32                65
 03/22/2021   06:58:13   ( -70.12,-108.17) 03/22/2021   06:57:14  ( -70.10,-108.12)    2.86                59
 03/22/2021   07:47:40   (  70.02,  59.32) 03/22/2021   07:47:59  (  70.03,  59.30)    1.81                19
 03/22/2021   08:37:21   ( -69.30,-134.02) 03/22/2021   08:38:29  ( -69.32,-132.34)   66.01                68
 03/24/2021   23:14:42   ( -70.11,   7.68) 03/24/2021   23:14:08  ( -70.08,   7.68)    2.60                34
 03/25/2021   00:04:09   (  70.00, 175.17) 03/25/2021   00:04:53  (  70.01, 175.10)    3.29                44
 03/27/2021   14:41:37   (  70.41, -43.64) 03/27/2021   14:40:26  (  70.47, -44.46)   31.10                71
 03/27/2021   15:31:11   ( -70.09, 123.53) 03/27/2021   15:31:02  ( -70.07, 123.48)    2.71                 9
 03/27/2021   16:20:38   (  69.97, -68.99) 03/27/2021   16:21:46  (  69.94, -69.02)    3.34                68
 03/30/2021   06:58:09   (  70.16,  71.88) 03/30/2021   06:57:13  (  70.14,  71.83)    2.97                56
 03/30/2021   07:47:40   ( -70.00,-120.71) 03/30/2021   07:47:54  ( -70.00,-120.64)    2.89                14
 03/30/2021   08:37:19   (  69.22,  45.88) 03/30/2021   08:38:26  (  69.24,  47.77)   74.84                67
 04/01/2021   23:14:39   (  70.07,-172.37) 04/01/2021   23:14:06  (  70.08,-172.30)    2.85                33
 04/02/2021   00:04:09   ( -69.97,  -4.88) 04/02/2021   00:04:48  ( -69.99,  -4.85)    1.81                39