Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 22.  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)
 06/22/2023   07:09:14   (  70.04,  68.81) 06/22/2023   07:10:13  (  70.06,  68.75)    2.86                59
 06/22/2023   07:59:56   ( -69.96,-123.74) 06/22/2023   07:59:43  ( -69.94,-123.78)    2.23                13
 06/22/2023   08:50:29   (  69.25,  44.59) 06/22/2023   08:49:20  (  69.29,  42.97)   63.65                69
 06/24/2023   23:26:08   (  70.04,-175.41) 06/24/2023   23:26:42  (  70.02,-175.41)    1.57                34
 06/25/2023   00:16:49   ( -69.89,  -7.88) 06/25/2023   00:16:12  ( -69.91,  -7.94)    2.98                37
 06/27/2023   14:52:27   ( -70.62, 132.14) 06/27/2023   14:53:36  ( -70.50, 133.53)   53.11                69
 06/27/2023   15:43:01   (  69.99, -59.57) 06/27/2023   15:43:11  (  69.96, -59.61)    3.36                10
 06/27/2023   16:33:43   ( -69.89, 107.90) 06/27/2023   16:32:40  ( -69.91, 107.94)    2.30                63
 06/30/2023   07:09:10   ( -70.05,-111.20) 06/30/2023   07:10:12  ( -70.04,-111.26)    2.65                62
 06/30/2023   07:59:54   (  69.95,  56.27) 06/30/2023   07:59:39  (  69.93,  56.23)    2.25                15
 06/30/2023   08:50:27   ( -69.37,-135.57) 06/30/2023   08:49:16  ( -69.44,-136.81)   48.99                71
 07/02/2023   23:26:02   ( -70.01,   4.63) 07/02/2023   23:26:38  ( -70.04,   4.64)    2.91                36
 07/03/2023   00:16:46   (  69.91, 172.09) 07/03/2023   00:16:05  (  69.93, 172.12)    2.00                41
 07/05/2023   14:52:20   (  70.46, -47.60) 07/05/2023   14:53:31  (  70.34, -46.67)   37.40                71
 07/05/2023   15:42:55   ( -69.98, 120.45) 07/05/2023   15:43:06  ( -69.96, 120.42)    3.04                11
 07/05/2023   16:33:39   (  69.89, -72.09) 07/05/2023   16:32:32  (  69.90, -72.02)    3.14                67