Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 12.  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)
 04/13/2023   22:35:59   (  71.08,-164.33) 04/13/2023   22:37:05  (  70.99,-161.75)   93.90                66
 04/13/2023   23:26:24   ( -70.10,   4.56) 04/13/2023   23:26:49  ( -70.11,   4.58)    1.97                25
 04/14/2023   00:17:08   (  69.98, 172.04) 04/14/2023   00:16:16  (  70.01, 172.08)    3.25                52
 04/16/2023   14:52:36   (  70.37, -47.40) 04/16/2023   14:53:47  (  70.28, -46.95)   19.84                71
 04/16/2023   15:43:14   ( -70.07, 120.38) 04/16/2023   15:43:19  ( -70.06, 120.37)    1.45                 5
 04/16/2023   16:33:58   (  69.96, -72.14) 04/16/2023   16:32:46  (  69.95, -72.13)    1.05                72
 04/19/2023   07:09:21   (  70.15,  68.73) 04/19/2023   07:10:17  (  70.16,  68.76)    1.97                56
 04/19/2023   08:00:03   ( -70.06,-123.81) 04/19/2023   07:59:47  ( -70.06,-123.76)    2.09                16
 04/19/2023   08:50:34   (  69.26,  44.67) 04/19/2023   08:49:26  (  69.29,  42.84)   72.17                68
 04/21/2023   23:26:10   (  70.10,-175.40) 04/21/2023   23:26:47  (  70.10,-175.45)    2.34                37
 04/22/2023   00:16:52   ( -70.00,  -7.94) 04/22/2023   00:16:17  ( -70.00,  -7.96)    1.01                35
 04/24/2023   14:52:30   ( -70.94, 131.73) 04/24/2023   14:53:38  ( -70.81, 133.82)   77.27                68
 04/24/2023   15:43:00   (  70.10, -59.62) 04/24/2023   15:43:16  (  70.10, -59.59)    1.48                16
 04/24/2023   16:33:42   ( -70.01, 107.84) 04/24/2023   16:32:46  ( -70.00, 107.90)    2.70                56