Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 1 14.  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)
 01/14/2021   14:41:51   ( -70.95, 137.23) 01/14/2021   14:40:44  ( -71.03, 134.63)   94.47                67
 01/14/2021   15:31:33   (  70.03, -56.49) 01/14/2021   15:31:11  (  70.03, -56.46)    1.61                22
 01/14/2021   16:21:03   ( -69.92, 110.98) 01/14/2021   16:21:53  ( -69.93, 111.00)    1.55                50
 01/17/2021   06:58:34   ( -70.12,-108.13) 01/17/2021   06:57:22  ( -70.11,-108.13)    1.00                72
 01/17/2021   07:48:01   (  70.01,  59.36) 01/17/2021   07:48:06  (  70.00,  59.34)    1.53                 5
 01/17/2021   08:37:33   ( -69.79,-133.31) 01/17/2021   08:38:46  ( -69.80,-133.03)   10.81                73
 01/19/2021   23:15:01   ( -70.10,   7.72) 01/19/2021   23:14:16  ( -70.08,   7.68)    2.00                45
 01/20/2021   00:04:28   (  69.99, 175.21) 01/20/2021   00:05:00  (  69.98, 175.15)    2.67                32
 01/22/2021   14:41:49   (  70.73, -43.11) 01/22/2021   14:40:40  (  70.75, -44.92)   66.43                69
 01/22/2021   15:31:30   ( -70.01, 123.49) 01/22/2021   15:31:10  ( -70.01, 123.56)    2.97                20
 01/22/2021   16:20:57   (  69.90, -69.02) 01/22/2021   16:21:54  (  69.91, -68.98)    1.86                57
 01/25/2021   06:58:28   (  70.09,  71.84) 01/25/2021   06:57:23  (  70.10,  71.88)    1.77                65
 01/25/2021   07:47:58   ( -69.98,-120.67) 01/25/2021   07:48:05  ( -69.99,-120.64)    1.53                 7
 01/25/2021   08:37:32   (  69.48,  46.29) 01/25/2021   08:38:42  (  69.52,  47.37)   42.30                70
 01/27/2021   23:14:56   (  70.05,-172.33) 01/27/2021   23:14:18  (  70.08,-172.32)    3.35                38
 01/28/2021   00:04:26   ( -69.95,  -4.84) 01/28/2021   00:05:00  ( -69.97,  -4.84)    2.50                34