Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 1 13.  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   ( -70.97, 137.26) 01/14/2021   14:40:44  ( -71.01, 134.66)   94.18                67
 01/14/2021   15:31:33   (  70.05, -56.46) 01/14/2021   15:31:12  (  70.06, -56.51)    1.90                21
 01/14/2021   16:21:03   ( -69.94, 111.01) 01/14/2021   16:21:53  ( -69.91, 111.03)    3.34                50
 01/17/2021   06:58:33   ( -70.14,-108.10) 01/17/2021   06:57:22  ( -70.14,-108.18)    2.89                71
 01/17/2021   07:48:01   (  69.98,  59.31) 01/17/2021   07:48:05  (  69.98,  59.37)    2.31                 4
 01/17/2021   08:37:33   ( -69.76,-133.36) 01/17/2021   08:38:45  ( -69.78,-133.00)   13.90                72
 01/19/2021   23:15:02   ( -70.06,   7.67) 01/19/2021   23:14:16  ( -70.07,   7.71)    1.50                46
 01/20/2021   00:04:29   (  69.95, 175.16) 01/20/2021   00:05:00  (  69.96, 175.17)    1.21                31
 01/22/2021   14:41:49   (  70.74, -43.08) 01/22/2021   14:40:41  (  70.78, -44.98)   69.68                68
 01/22/2021   15:31:30   ( -70.03, 123.51) 01/22/2021   15:31:11  ( -70.04, 123.51)    1.22                19
 01/22/2021   16:20:57   (  69.92, -69.00) 01/22/2021   16:21:55  (  69.94, -69.03)    2.79                58
 01/25/2021   06:58:28   (  70.11,  71.87) 01/25/2021   06:57:23  (  70.08,  71.90)    3.02                65
 01/25/2021   07:47:58   ( -70.00,-120.65) 01/25/2021   07:48:06  ( -70.02,-120.69)    3.18                 8
 01/25/2021   08:37:32   (  69.50,  46.31) 01/25/2021   08:38:42  (  69.50,  47.39)   42.00                70