Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 8 18.  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   (  69.99, 172.10) 08/20/2023   00:16:40  (  70.00, 172.16)    2.80                35
 08/20/2023   01:06:46   ( -69.85, -20.37) 08/20/2023   01:06:11  ( -69.84, -20.44)    2.69                35
 08/22/2023   15:42:27   ( -70.58, 119.64) 08/22/2023   15:43:37  ( -70.45, 121.03)   53.78                70
 08/22/2023   16:33:01   (  69.93, -72.05) 08/22/2023   16:33:11  (  69.96, -72.03)    3.02                10
 08/22/2023   17:23:43   ( -69.84,  95.40) 08/22/2023   17:22:41  ( -69.85,  95.46)    2.47                62
 08/25/2023   07:59:13   ( -70.00,-123.70) 08/25/2023   08:00:15  ( -69.99,-123.74)    1.46                62
 08/25/2023   08:49:57   (  69.88,  43.78) 08/25/2023   08:49:42  (  69.88,  43.75)    1.31                15
 08/25/2023   09:40:30   ( -69.31,-148.07) 08/25/2023   09:39:20  ( -69.34,-149.36)   50.42                70
 08/28/2023   00:16:08   ( -69.95,  -7.87) 08/28/2023   00:16:44  ( -69.95,  -7.91)    1.66                36
 08/28/2023   01:06:52   (  69.84, 159.61) 08/28/2023   01:06:11  (  69.84, 159.57)    1.52                41
 08/30/2023   15:42:29   (  70.38, -60.08) 08/30/2023   15:43:39  (  70.26, -59.22)   34.64                70
 08/30/2023   16:33:04   ( -69.91, 107.95) 08/30/2023   16:33:13  ( -69.94, 107.95)    3.32                 9
 08/30/2023   17:23:48   (  69.80, -84.57) 08/30/2023   17:22:40  (  69.82, -84.56)    3.02                68