Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 4 20.  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)
 04/20/2021   14:41:27   ( -70.51, 136.47) 04/20/2021   14:40:16  ( -70.59, 135.39)   41.00                71
 04/20/2021   15:31:00   (  70.08, -56.51) 04/20/2021   15:30:53  (  70.10, -56.53)    2.26                 7
 04/20/2021   16:20:30   ( -69.97, 110.97) 04/20/2021   16:21:34  ( -69.97, 110.99)    0.89                64
 04/23/2021   06:58:01   ( -70.17,-108.15) 04/23/2021   06:57:02  ( -70.18,-108.18)    1.58                59
 04/23/2021   07:47:28   (  70.06,  59.34) 04/23/2021   07:47:46  (  70.06,  59.31)    1.16                18
 04/23/2021   08:37:08   ( -69.40,-133.93) 04/23/2021   08:38:17  ( -69.39,-132.39)   60.28                69
 04/25/2021   23:14:29   ( -70.15,   7.69) 04/25/2021   23:13:55  ( -70.14,   7.66)    1.67                34
 04/26/2021   00:03:56   (  70.03, 175.18) 04/26/2021   00:04:39  (  70.02, 175.15)    2.12                43
 04/28/2021   14:41:23   (  70.44, -43.63) 04/28/2021   14:40:12  (  70.50, -44.46)   31.52                71
 04/28/2021   15:30:57   ( -70.12, 123.53) 04/28/2021   15:30:48  ( -70.10, 123.50)    2.70                 9
 04/28/2021   16:20:24   (  70.00, -68.98) 04/28/2021   16:21:32  (  69.99, -69.02)    2.55                68
 05/01/2021   06:57:54   (  70.19,  71.88) 05/01/2021   06:56:58  (  70.16,  71.87)    3.14                56
 05/01/2021   07:47:24   ( -70.08,-120.63) 05/01/2021   07:47:40  ( -70.06,-120.67)    2.91                16
 05/01/2021   08:37:04   (  69.25,  45.87) 05/01/2021   08:38:11  (  69.26,  47.81)   76.38                67
 05/03/2021   23:14:22   (  70.14,-172.30) 05/03/2021   23:13:51  (  70.13,-172.31)    1.69                31
 05/04/2021   00:03:52   ( -70.04,  -4.81) 05/04/2021   00:04:33  ( -70.03,  -4.84)    2.17                41