Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 5 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)
 05/19/2021   22:24:49   ( -70.99,  21.43) 05/19/2021   22:23:42  ( -71.03,  18.85)   93.32                67
 05/19/2021   23:14:31   (  70.07,-172.30) 05/19/2021   23:14:10  (  70.08,-172.31)    1.54                21
 05/20/2021   00:04:01   ( -69.96,  -4.82) 05/20/2021   00:04:51  ( -69.93,  -4.77)    3.27                50
 05/22/2021   14:41:35   ( -70.15, 136.06) 05/22/2021   14:40:22  ( -70.13, 136.08)    3.22                73
 05/22/2021   15:31:02   (  70.05, -56.45) 05/22/2021   15:31:07  (  70.07, -56.53)    3.74                 5
 05/22/2021   16:20:34   ( -69.83, 110.88) 05/22/2021   16:21:46  ( -69.81, 111.18)   11.53                72
 05/25/2021   06:58:05   ( -70.14,-108.09) 05/25/2021   06:57:18  ( -70.11,-108.14)    3.06                47
 05/25/2021   07:47:32   (  70.03,  59.40) 05/25/2021   07:48:02  (  70.01,  59.33)    3.49                30
 05/27/2021   22:24:54   (  70.87,-158.75) 05/27/2021   22:23:46  (  70.89,-160.94)   79.78                68
 05/27/2021   23:14:37   ( -70.06,   7.67) 05/27/2021   23:14:14  ( -70.05,   7.72)    1.83                23
 05/28/2021   00:04:04   (  69.95, 175.16) 05/28/2021   00:04:58  (  69.95, 175.18)    0.83                54
 05/30/2021   14:41:38   (  70.13, -43.98) 05/30/2021   14:40:29  (  70.15, -43.99)    2.71                69
 05/30/2021   15:31:08   ( -70.03, 123.51) 05/30/2021   15:31:11  ( -70.04, 123.49)    1.89                 3
 05/30/2021   16:20:39   (  69.70, -69.31) 05/30/2021   16:21:50  (  69.68, -68.65)   25.40                71