Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 6 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)
 06/20/2021   22:25:09   ( -70.62,  20.86) 06/20/2021   22:23:59  ( -70.70,  19.33)   56.92                70
 06/20/2021   23:14:45   (  70.03,-172.36) 06/20/2021   23:14:33  (  70.06,-172.35)    3.41                12
 06/21/2021   00:04:15   ( -69.91,  -4.89) 06/21/2021   00:05:14  ( -69.91,  -4.81)    2.92                59
 06/23/2021   14:41:48   ( -70.11, 136.00) 06/23/2021   14:40:45  ( -70.09, 136.05)    3.00                63
 06/23/2021   15:31:15   (  70.01, -56.50) 06/23/2021   15:31:30  (  70.03, -56.55)    2.93                15
 06/23/2021   16:20:53   ( -69.46, 110.37) 06/23/2021   16:22:03  ( -69.46, 111.62)   48.48                70
 06/26/2021   06:58:18   ( -70.10,-108.14) 06/26/2021   06:57:42  ( -70.06,-108.14)    3.41                36
 06/26/2021   07:47:46   (  69.94,  59.28) 06/26/2021   07:48:26  (  69.95,  59.34)    2.95                40
 06/28/2021   22:25:13   (  70.40,-159.45) 06/28/2021   22:24:02  (  70.46,-160.31)   32.47                71
 06/28/2021   23:14:48   ( -70.02,   7.63) 06/28/2021   23:14:38  ( -70.04,   7.66)    2.35                10
 06/29/2021   00:04:15   (  69.91, 175.13) 06/29/2021   00:05:22  (  69.93, 175.13)    2.07                67
 07/01/2021   14:41:48   (  70.10, -44.00) 07/01/2021   14:40:53  (  70.12, -44.01)    2.07                55
 07/01/2021   15:31:18   ( -70.00, 123.48) 07/01/2021   15:31:35  ( -70.02, 123.46)    2.35                17
 07/01/2021   16:20:58   (  69.17, -70.00) 07/01/2021   16:22:05  (  69.16, -67.99)   79.49                67