Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 1 30.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 01/31/2023   22:36:49   ( -71.06,  15.68) 01/31/2023   22:37:55  ( -70.99,  18.24)   93.22                66
 01/31/2023   23:27:16   (  70.06,-175.40) 01/31/2023   23:27:37  (  70.07,-175.48)    3.38                21
 02/01/2023   00:17:58   ( -69.97,  -7.96) 02/01/2023   00:17:07  ( -69.96,  -8.00)    2.04                51
 02/03/2023   14:53:27   ( -70.28, 132.71) 02/03/2023   14:54:38  ( -70.23, 132.97)   11.68                71
 02/03/2023   15:44:09   (  70.07, -59.65) 02/03/2023   15:44:06  (  70.07, -59.61)    1.30                 3
 02/03/2023   16:34:50   ( -69.92, 107.89) 02/03/2023   16:33:36  ( -69.96, 107.87)    3.94                74
 02/06/2023   07:10:17   ( -70.14,-111.30) 02/06/2023   07:11:08  ( -70.15,-111.26)    1.86                51
 02/06/2023   08:01:01   (  70.03,  56.18) 02/06/2023   08:00:35  (  70.04,  56.23)    2.16                26
 02/06/2023   08:51:27   ( -69.09,-135.14) 02/06/2023   08:50:20  ( -69.11,-137.40)   89.46                67
 02/08/2023   23:27:09   ( -70.11,   4.53) 02/08/2023   23:27:37  ( -70.11,   4.56)    1.27                28
 02/09/2023   00:17:53   (  70.00, 172.00) 02/09/2023   00:17:04  (  69.99, 172.04)    2.04                49
 02/11/2023   14:53:21   (  70.34, -47.38) 02/11/2023   14:54:33  (  70.26, -46.98)   17.73                72
 02/11/2023   15:43:59   ( -70.03, 120.42) 02/11/2023   15:44:05  ( -70.04, 120.35)    2.83                 6
 02/11/2023   16:34:43   (  69.93, -72.12) 02/11/2023   16:33:32  (  69.93, -72.17)    1.91                71