Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 6 20.  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)
 06/20/2021   22:25:09   ( -70.62,  20.87) 06/20/2021   22:23:59  ( -70.69,  19.34)   56.73                70
 06/20/2021   23:14:45   (  70.03,-172.35) 06/20/2021   23:14:33  (  70.05,-172.34)    2.09                12
 06/21/2021   00:04:15   ( -69.92,  -4.88) 06/21/2021   00:05:14  ( -69.91,  -4.80)    3.10                59
 06/23/2021   14:41:48   ( -70.12, 136.01) 06/23/2021   14:40:46  ( -70.14, 135.98)    2.65                62
 06/23/2021   15:31:15   (  70.02, -56.49) 06/23/2021   15:31:30  (  70.03, -56.54)    2.08                15
 06/23/2021   16:20:53   ( -69.46, 110.38) 06/23/2021   16:22:03  ( -69.46, 111.62)   48.47                70
 06/26/2021   06:58:19   ( -70.05,-108.21) 06/26/2021   06:57:42  ( -70.06,-108.13)    3.19                37
 06/26/2021   07:47:46   (  69.94,  59.29) 06/26/2021   07:48:26  (  69.95,  59.34)    2.18                40
 06/28/2021   22:25:13   (  70.41,-159.44) 06/28/2021   22:24:02  (  70.45,-160.30)   32.35                71
 06/28/2021   23:14:48   ( -70.03,   7.64) 06/28/2021   23:14:38  ( -70.03,   7.67)    1.13                10
 06/29/2021   00:04:15   (  69.92, 175.14) 06/29/2021   00:05:22  (  69.93, 175.14)    0.53                67
 07/01/2021   14:41:48   (  70.11, -43.99) 07/01/2021   14:40:53  (  70.11, -44.00)    0.62                55
 07/01/2021   15:31:18   ( -70.01, 123.49) 07/01/2021   15:31:35  ( -70.01, 123.47)    1.21                17
 07/01/2021   16:20:58   (  69.18, -69.99) 07/01/2021   16:22:05  (  69.16, -67.98)   79.29                67
 07/04/2021   06:58:18   (  70.08,  71.85) 07/04/2021   06:57:50  (  70.09,  71.79)    2.62                28