Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 2 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)
 02/15/2021   14:41:48   ( -70.77, 136.92) 02/15/2021   14:40:40  ( -70.82, 134.94)   72.55                68
 02/15/2021   15:31:27   (  70.02, -56.54) 02/15/2021   15:31:11  (  70.03, -56.49)    2.05                16
 02/15/2021   16:20:56   ( -69.96, 111.01) 02/15/2021   16:21:53  ( -69.94, 110.97)    2.69                57
 02/18/2021   06:58:28   ( -70.13,-108.14) 02/18/2021   06:57:22  ( -70.14,-108.20)    2.33                66
 02/18/2021   07:47:55   (  70.03,  59.36) 02/18/2021   07:48:06  (  70.03,  59.28)    2.98                11
 02/18/2021   08:37:31   ( -69.59,-133.62) 02/18/2021   08:38:42  ( -69.62,-132.79)   32.45                71
 02/20/2021   23:14:57   ( -70.09,   7.67) 02/20/2021   23:14:16  ( -70.09,   7.65)    1.01                41
 02/21/2021   00:04:24   (  69.98, 175.17) 02/21/2021   00:05:00  (  69.98, 175.12)    1.76                36
 02/23/2021   14:41:47   (  70.59, -43.35) 02/23/2021   14:40:37  (  70.67, -44.81)   54.38                70
 02/23/2021   15:31:25   ( -70.04, 123.48) 02/23/2021   15:31:09  ( -70.05, 123.49)    0.71                16
 02/23/2021   16:20:52   (  69.93, -69.02) 02/23/2021   16:21:53  (  69.94, -69.04)    0.74                61
 02/26/2021   06:58:24   (  70.09,  71.80) 02/26/2021   06:57:21  (  70.10,  71.86)    2.40                63
 02/26/2021   07:47:54   ( -69.99,-120.71) 02/26/2021   07:48:03  ( -70.00,-120.67)    2.34                 9
 02/26/2021   08:37:29   (  69.43,  46.18) 02/26/2021   08:38:38  (  69.42,  47.50)   51.85                69
 02/28/2021   23:14:52   (  70.09,-172.32) 02/28/2021   23:14:15  (  70.06,-172.30)    3.14                37
 03/01/2021   00:04:22   ( -69.98,  -4.84) 03/01/2021   00:04:57  ( -69.96,  -4.83)    2.61                35