Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 4 15.  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)
 04/15/2021   06:58:03   (  70.18,  71.87) 04/15/2021   06:57:07  (  70.17,  71.80)    2.87                56
 04/15/2021   07:47:33   ( -70.06,-120.65) 04/15/2021   07:47:48  ( -70.04,-120.68)    2.50                15
 04/15/2021   08:37:12   (  69.30,  45.95) 04/15/2021   08:38:20  (  69.28,  47.75)   70.86                68
 04/17/2021   23:14:32   (  70.11,-172.34) 04/17/2021   23:14:00  (  70.13,-172.35)    1.46                32
 04/18/2021   00:04:02   ( -70.00,  -4.86) 04/18/2021   00:04:41  ( -69.99,  -4.83)    1.78                39
 04/20/2021   14:41:27   ( -70.54, 136.51) 04/20/2021   14:40:16  ( -70.57, 135.43)   40.39                71
 04/20/2021   15:31:00   (  70.10, -56.48) 04/20/2021   15:30:53  (  70.08, -56.50)    2.30                 7
 04/20/2021   16:20:30   ( -70.00, 111.00) 04/20/2021   16:21:35  ( -70.00, 110.94)    2.37                65
 04/23/2021   06:58:02   ( -70.14,-108.19) 04/23/2021   06:57:02  ( -70.16,-108.15)    2.07                60
 04/23/2021   07:47:29   (  70.03,  59.30) 04/23/2021   07:47:46  (  70.04,  59.34)    2.06                17
 04/23/2021   08:37:09   ( -69.38,-133.96) 04/23/2021   08:38:17  ( -69.37,-132.36)   62.85                68
 04/25/2021   23:14:29   ( -70.12,   7.66) 04/25/2021   23:13:54  ( -70.11,   7.70)    1.61                35
 04/26/2021   00:03:56   (  70.01, 175.14) 04/26/2021   00:04:38  (  70.00, 175.17)    1.07                42
 04/28/2021   14:41:23   (  70.42, -43.66) 04/28/2021   14:40:11  (  70.49, -44.43)   29.63                72
 04/28/2021   15:30:57   ( -70.10, 123.51) 04/28/2021   15:30:47  ( -70.07, 123.53)    2.92                10
 04/28/2021   16:20:24   (  69.98, -69.01) 04/28/2021   16:21:31  (  69.97, -69.00)    1.41                67