Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 6 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)
 06/20/2021   22:25:08   ( -70.66,  20.92) 06/20/2021   22:23:59  ( -70.71,  19.31)   59.42                69
 06/20/2021   23:14:44   (  70.07,-172.30) 06/20/2021   23:14:33  (  70.07,-172.37)    2.73                11
 06/21/2021   00:04:14   ( -69.95,  -4.83) 06/21/2021   00:05:14  ( -69.92,  -4.83)    3.33                60
 06/23/2021   14:41:48   ( -70.10, 135.98) 06/23/2021   14:40:45  ( -70.10, 136.03)    2.02                63
 06/23/2021   15:31:15   (  70.00, -56.52) 06/23/2021   15:31:29  (  69.99, -56.49)    1.29                14
 06/23/2021   16:20:53   ( -69.45, 110.36) 06/23/2021   16:22:03  ( -69.47, 111.60)   48.52                70
 06/26/2021   06:58:18   ( -70.08,-108.16) 06/26/2021   06:57:42  ( -70.08,-108.16)    0.52                36
 06/26/2021   07:47:45   (  69.98,  59.34) 06/26/2021   07:48:26  (  69.97,  59.31)    1.26                41
 06/28/2021   22:25:14   (  70.39,-159.47) 06/28/2021   22:24:02  (  70.42,-160.25)   29.31                72
 06/28/2021   23:14:48   ( -70.06,   7.69) 06/28/2021   23:14:39  ( -70.06,   7.64)    2.31                 9
 06/29/2021   00:04:15   (  69.95, 175.18) 06/29/2021   00:05:23  (  69.95, 175.11)    2.96                68
 07/01/2021   14:41:48   (  70.09, -44.02) 07/01/2021   14:40:52  (  70.09, -43.96)    2.36                56
 07/01/2021   15:31:18   ( -69.98, 123.46) 07/01/2021   15:31:34  ( -69.98, 123.51)    1.84                16
 07/01/2021   16:20:58   (  69.15, -70.02) 07/01/2021   16:22:05  (  69.19, -68.02)   79.16                67