Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 4 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)
 04/20/2021   14:41:28   ( -70.49, 136.44) 04/20/2021   14:40:16  ( -70.56, 135.44)   37.80                72
 04/20/2021   15:31:01   (  70.06, -56.54) 04/20/2021   15:30:53  (  70.07, -56.48)    2.42                 8
 04/20/2021   16:20:30   ( -70.00, 111.01) 04/20/2021   16:21:35  ( -69.99, 110.96)    2.65                65
 04/23/2021   06:58:01   ( -70.15,-108.18) 04/23/2021   06:57:01  ( -70.15,-108.13)    1.87                60
 04/23/2021   07:47:28   (  70.04,  59.31) 04/23/2021   07:47:45  (  70.03,  59.36)    2.30                17
 04/23/2021   08:37:08   ( -69.38,-133.96) 04/23/2021   08:38:17  ( -69.41,-132.42)   60.26                69
 04/25/2021   23:14:29   ( -70.13,   7.67) 04/25/2021   23:13:54  ( -70.10,   7.71)    3.16                35
 04/26/2021   00:03:56   (  70.01, 175.16) 04/26/2021   00:04:39  (  70.04, 175.11)    3.31                43
 04/28/2021   14:41:23   (  70.42, -43.66) 04/28/2021   14:40:11  (  70.47, -44.41)   28.47                72
 04/28/2021   15:30:57   ( -70.10, 123.51) 04/28/2021   15:30:48  ( -70.12, 123.47)    2.30                 9
 04/28/2021   16:20:24   (  69.99, -69.01) 04/28/2021   16:21:32  (  70.01, -69.05)    2.91                68
 05/01/2021   06:57:55   (  70.17,  71.86) 05/01/2021   06:56:59  (  70.18,  71.83)    1.20                56
 05/01/2021   07:47:25   ( -70.07,-120.65) 05/01/2021   07:47:41  ( -70.08,-120.70)    2.01                16
 05/01/2021   08:37:04   (  69.29,  45.93) 05/01/2021   08:38:12  (  69.28,  47.78)   72.99                68