Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 24.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 10/24/2023   08:24:41   (  69.90,  50.00) 10/24/2023   08:25:13  (  69.90,  49.93)    2.78                32
 10/24/2023   09:15:23   ( -69.81,-142.55) 10/24/2023   09:14:42  ( -69.84,-142.52)    2.61                41
 10/26/2023   23:50:59   ( -70.18,  -1.98) 10/26/2023   23:52:11  ( -70.10,  -1.54)   19.02                72
 10/27/2023   00:41:40   (  69.90, 165.74) 10/27/2023   00:41:40  (  69.89, 165.80)    3.06                 0
 10/27/2023   01:32:21   ( -69.76, -26.72) 10/27/2023   01:31:10  ( -69.77, -26.72)    1.62                71
 10/29/2023   16:07:54   ( -69.93, 114.16) 10/29/2023   16:08:41  ( -69.95, 114.14)    2.91                47
 10/29/2023   16:58:38   (  69.81, -78.36) 10/29/2023   16:58:08  (  69.84, -78.37)    3.53                30
 11/01/2023   07:34:22   (  70.57,  61.58) 11/01/2023   07:35:31  (  70.43,  63.08)   57.98                69
 11/01/2023   08:24:53   ( -69.89,-130.04) 11/01/2023   08:25:09  ( -69.88,-130.07)    1.78                16
 11/01/2023   09:15:37   (  69.78,  37.43) 11/01/2023   09:14:36  (  69.77,  37.42)    1.57                61
 11/03/2023   23:51:10   (  69.97, 178.27) 11/03/2023   23:52:05  (  69.99, 178.35)    3.45                55
 11/04/2023   00:41:51   ( -69.82, -14.18) 11/04/2023   00:41:36  ( -69.83, -14.25)    3.10                15
 11/04/2023   01:32:22   (  69.02, 154.28) 11/04/2023   01:31:14  (  69.11, 152.43)   74.06                68
 11/06/2023   16:08:07   (  69.91, -65.88) 11/06/2023   16:08:31  (  69.91, -65.87)    0.77                24
 11/06/2023   16:58:49   ( -69.80, 101.60) 11/06/2023   16:58:01  ( -69.80, 101.61)    0.72                48