Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 2 3.  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)
 02/03/2023   14:53:27   ( -70.26, 132.74) 02/03/2023   14:54:38  ( -70.24, 132.99)    9.89                71
 02/03/2023   15:44:09   (  70.04, -59.61) 02/03/2023   15:44:07  (  70.03, -59.66)    2.33                 2
 02/03/2023   16:34:50   ( -69.90, 107.91) 02/03/2023   16:33:37  ( -69.92, 107.81)    4.19                73
 02/06/2023   07:10:17   ( -70.12,-111.27) 02/06/2023   07:11:09  ( -70.11,-111.32)    2.44                52
 02/06/2023   08:01:01   (  70.01,  56.21) 02/06/2023   08:00:36  (  70.00,  56.17)    1.60                25
 02/06/2023   08:51:26   ( -69.07,-135.12) 02/06/2023   08:50:19  ( -69.12,-137.38)   90.04                67
 02/08/2023   23:27:08   ( -70.09,   4.55) 02/08/2023   23:27:36  ( -70.12,   4.57)    3.13                28
 02/09/2023   00:17:52   (  69.98, 172.03) 02/09/2023   00:17:04  (  69.95, 171.99)    3.29                48
 02/11/2023   14:53:22   (  70.37, -47.43) 02/11/2023   14:54:33  (  70.27, -46.96)   20.85                71
 02/11/2023   15:44:00   ( -70.07, 120.36) 02/11/2023   15:44:05  ( -70.05, 120.36)    1.65                 5
 02/11/2023   16:34:44   (  69.96, -72.16) 02/11/2023   16:33:32  (  69.94, -72.15)    2.13                72
 02/14/2023   07:10:10   (  70.15,  68.70) 02/14/2023   07:11:03  (  70.13,  68.72)    2.56                53
 02/14/2023   08:00:51   ( -70.00,-123.76) 02/14/2023   08:00:33  ( -70.02,-123.80)    3.03                18
 02/14/2023   08:51:21   (  69.15,  44.78) 02/14/2023   08:50:13  (  69.19,  42.72)   81.86                68
 02/16/2023   23:27:01   (  70.09,-175.44) 02/16/2023   23:27:31  (  70.07,-175.47)    2.31                30
 02/17/2023   00:17:43   ( -69.99,  -7.97) 02/17/2023   00:17:01  ( -69.97,  -7.99)    2.29                42