Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 23.  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)
 09/23/2023   15:42:35   ( -70.43, 119.79) 09/23/2023   15:43:45  ( -70.32, 120.85)   41.47                70
 09/23/2023   16:33:11   (  69.88, -72.06) 09/23/2023   16:33:18  (  69.89, -72.12)    2.58                 7
 09/23/2023   17:23:53   ( -69.80,  95.37) 09/23/2023   17:22:48  ( -69.78,  95.36)    2.71                65
 09/26/2023   07:59:20   ( -69.96,-123.72) 09/26/2023   08:00:21  ( -69.98,-123.76)    3.23                61
 09/26/2023   08:50:05   (  69.89,  43.70) 09/26/2023   08:49:48  (  69.88,  43.74)    1.62                17
 09/26/2023   09:40:37   ( -69.28,-148.10) 09/26/2023   09:39:26  ( -69.33,-149.38)   50.71                71
 09/29/2023   00:16:14   ( -69.92,  -7.89) 09/29/2023   00:16:52  ( -69.94,  -7.95)    3.21                38
 09/29/2023   01:06:59   (  69.85, 159.52) 09/29/2023   01:06:19  (  69.83, 159.55)    2.44                40
 10/01/2023   15:42:36   (  70.51, -60.34) 10/01/2023   15:43:45  (  70.40, -59.04)   49.98                69
 10/01/2023   16:33:08   ( -69.89, 107.93) 10/01/2023   16:33:22  ( -69.91, 107.89)    2.70                14
 10/01/2023   17:23:52   (  69.77, -84.59) 10/01/2023   17:22:49  (  69.80, -84.61)    3.20                63
 10/04/2023   07:59:20   (  69.96,  56.27) 10/04/2023   08:00:22  (  69.95,  56.20)    2.93                62
 10/04/2023   08:50:02   ( -69.87,-136.27) 10/04/2023   08:49:52  ( -69.85,-136.31)    2.84                10
 10/04/2023   09:40:37   (  69.28,  31.89) 10/04/2023   09:39:27  (  69.29,  30.58)   51.51                70
 10/07/2023   00:16:13   (  69.96, 172.04) 10/07/2023   00:16:49  (  69.96, 172.10)    2.24                36
 10/07/2023   01:06:54   ( -69.81, -20.42) 10/07/2023   01:06:20  ( -69.81, -20.48)    2.61                34