Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 1 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)
 01/19/2021   23:15:03   ( -70.05,   7.65) 01/19/2021   23:14:16  ( -70.07,   7.70)    2.99                47
 01/20/2021   00:04:30   (  69.95, 175.15) 01/20/2021   00:05:00  (  69.96, 175.18)    1.56                30
 01/22/2021   14:41:50   (  70.82, -42.97) 01/22/2021   14:40:42  (  70.83, -45.06)   76.32                68
 01/22/2021   15:31:32   ( -70.06, 123.53) 01/22/2021   15:31:11  ( -70.05, 123.50)    1.39                21
 01/22/2021   16:20:59   (  69.95, -68.97) 01/22/2021   16:21:55  (  69.94, -69.03)    2.44                56
 01/25/2021   06:58:32   (  70.11,  71.85) 01/25/2021   06:57:24  (  70.13,  71.82)    2.89                68
 01/25/2021   07:48:02   ( -70.00,-120.67) 01/25/2021   07:48:05  ( -69.98,-120.62)    3.07                 3
 01/25/2021   08:37:34   (  69.62,  46.45) 01/25/2021   08:38:45  (  69.66,  47.16)   27.76                71
 01/27/2021   23:15:01   (  70.05,-172.35) 01/27/2021   23:14:17  (  70.07,-172.31)    2.85                44
 01/28/2021   00:04:31   ( -69.94,  -4.87) 01/28/2021   00:04:59  ( -69.97,  -4.84)    2.72                28
 01/30/2021   14:41:50   ( -70.86, 137.08) 01/30/2021   14:40:42  ( -70.89, 134.83)   81.80                68
 01/30/2021   15:31:30   (  70.04, -56.49) 01/30/2021   15:31:12  (  70.07, -56.53)    3.22                18
 01/30/2021   16:21:00   ( -69.94, 111.00) 01/30/2021   16:21:54  ( -69.96, 110.95)    2.93                54