Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 21.  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   15:42:33   ( -70.35, 119.91) 09/23/2023   15:43:44  ( -70.29, 120.80)   34.24                71
 09/23/2023   16:33:11   (  69.91, -72.11) 09/23/2023   16:33:16  (  69.91, -72.09)    0.59                 5
 09/23/2023   17:23:52   ( -69.78,  95.41) 09/23/2023   17:22:46  ( -69.80,  95.39)    2.23                66
 09/26/2023   07:59:21   ( -69.98,-123.75) 09/26/2023   08:00:17  ( -70.01,-123.71)    3.01                56
 09/26/2023   08:50:05   (  69.86,  43.74) 09/26/2023   08:49:45  (  69.84,  43.71)    2.18                20
 09/26/2023   09:40:34   ( -69.09,-147.83) 09/26/2023   09:39:25  ( -69.18,-149.55)   68.79                69
 09/29/2023   00:16:15   ( -69.94,  -7.92) 09/29/2023   00:16:45  ( -69.97,  -7.88)    3.22                30
 09/29/2023   01:06:59   (  69.82, 159.57) 09/29/2023   01:06:13  (  69.80, 159.54)    2.66                46
 10/01/2023   15:42:29   (  70.16, -59.80) 10/01/2023   15:43:40  (  70.11, -59.42)   15.44                71
 10/01/2023   16:33:08   ( -69.91, 107.90) 10/01/2023   16:33:12  ( -69.89, 107.91)    1.93                 4
 10/01/2023   17:23:52   (  69.79, -84.62) 10/01/2023   17:22:39  (  69.78, -84.60)    1.97                73
 10/04/2023   07:59:19   (  69.93,  56.32) 10/04/2023   08:00:09  (  69.94,  56.24)    3.30                50
 10/04/2023   08:50:01   ( -69.83,-136.22) 10/04/2023   08:49:39  ( -69.84,-136.27)    1.90                22