Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 9 10.  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)
 09/11/2021   14:42:12   ( -70.10, 135.99) 09/11/2021   14:41:35  ( -70.10, 135.92)    2.76                37
 09/11/2021   15:31:40   (  69.95, -56.59) 09/11/2021   15:32:18  (  69.93, -56.52)    3.14                38
 09/14/2021   06:09:07   (  70.47,  84.76) 09/14/2021   06:07:56  (  70.55,  83.67)   41.77                71
 09/14/2021   06:58:43   ( -70.03,-108.24) 09/14/2021   06:58:30  ( -70.03,-108.21)    1.22                13
 09/14/2021   07:48:10   (  69.92,  59.26) 09/14/2021   07:49:14  (  69.92,  59.27)    0.58                64
 09/16/2021   22:25:43   (  70.11,-159.88) 09/16/2021   22:24:44  (  70.12,-159.89)    1.02                59
 09/16/2021   23:15:13   ( -70.00,   7.61) 09/16/2021   23:15:26  ( -70.02,   7.58)    2.03                13
 09/17/2021   00:04:51   (  69.29, 174.28) 09/17/2021   00:05:59  (  69.33, 175.91)   64.37                68
 09/19/2021   14:42:12   (  70.08, -44.04) 09/19/2021   14:41:38  (  70.06, -44.02)    2.04                34
 09/19/2021   15:31:42   ( -69.97, 123.44) 09/19/2021   15:32:20  ( -69.96, 123.45)    1.76                38
 09/22/2021   06:09:09   ( -70.48, -95.22) 09/22/2021   06:07:58  ( -70.57, -96.37)   43.99                71
 09/22/2021   06:58:42   (  70.04,  71.78) 09/22/2021   06:58:34  (  70.06,  71.75)    2.32                 8
 09/22/2021   07:48:12   ( -69.94,-120.73) 09/22/2021   07:49:16  ( -69.95,-120.77)    2.22                64