Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 8 19.  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)
 08/20/2023   00:16:05   (  69.98, 172.11) 08/20/2023   00:16:41  (  69.96, 172.10)    2.17                36
 08/20/2023   01:06:46   ( -69.84, -20.36) 08/20/2023   01:06:11  ( -69.85, -20.42)    2.58                35
 08/22/2023   15:42:27   ( -70.58, 119.64) 08/22/2023   15:43:37  ( -70.46, 121.05)   54.00                70
 08/22/2023   16:33:01   (  69.93, -72.05) 08/22/2023   16:33:12  (  69.92, -72.09)    2.14                11
 08/22/2023   17:23:43   ( -69.84,  95.40) 08/22/2023   17:22:41  ( -69.86,  95.47)    3.65                62
 08/25/2023   07:59:12   ( -70.01,-123.72) 08/25/2023   08:00:14  ( -70.01,-123.72)    0.30                62
 08/25/2023   08:49:56   (  69.89,  43.77) 08/25/2023   08:49:41  (  69.90,  43.77)    0.69                15
 08/25/2023   09:40:29   ( -69.33,-148.09) 08/25/2023   09:39:18  ( -69.41,-149.26)   46.90                71
 08/28/2023   00:16:08   ( -69.98,  -7.92) 08/28/2023   00:16:44  ( -69.97,  -7.89)    1.86                36
 08/28/2023   01:06:52   (  69.87, 159.57) 08/28/2023   01:06:11  (  69.86, 159.59)    1.63                41
 08/30/2023   15:42:28   (  70.38, -60.08) 08/30/2023   15:43:39  (  70.28, -59.20)   34.84                71
 08/30/2023   16:33:03   ( -69.92, 107.95) 08/30/2023   16:33:14  ( -69.90, 107.90)    2.36                11
 08/30/2023   17:23:47   (  69.80, -84.57) 08/30/2023   17:22:41  (  69.79, -84.62)    2.29                66