Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 23.  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)
 08/23/2023   23:50:45   ( -70.03,  -1.63) 08/23/2023   23:51:52  ( -70.02,  -1.62)    0.49                67
 08/24/2023   00:41:29   (  69.90, 165.87) 08/24/2023   00:41:19  (  69.93, 165.89)    2.90                10
 08/24/2023   01:32:05   ( -69.50, -26.22) 08/24/2023   01:30:53  ( -69.59, -26.94)   29.53                72
 08/26/2023   16:07:40   ( -69.98, 114.21) 08/26/2023   16:08:23  ( -69.98, 114.19)    0.68                43
 08/26/2023   16:58:24   (  69.86, -78.30) 08/26/2023   16:57:50  (  69.88, -78.31)    2.07                34
 08/29/2023   07:34:06   (  70.66,  61.58) 08/29/2023   07:35:15  (  70.56,  63.28)   63.67                69
 08/29/2023   08:24:36   ( -69.94,-129.97) 08/29/2023   08:24:54  ( -69.96,-129.96)    1.97                18
 08/29/2023   09:15:20   (  69.82,  37.52) 08/29/2023   09:14:22  (  69.80,  37.46)    3.25                58
 08/31/2023   23:50:50   (  70.00, 178.38) 08/31/2023   23:51:55  (  70.02, 178.37)    2.16                65
 09/01/2023   00:41:32   ( -69.91, -14.16) 09/01/2023   00:41:25  ( -69.91, -14.14)    0.90                 7
 09/01/2023   01:32:09   (  69.42, 153.86) 09/01/2023   01:30:58  (  69.47, 152.90)   38.19                71
 09/03/2023   16:07:46   (  69.98, -65.82) 09/03/2023   16:08:25  (  70.00, -65.78)    2.82                39
 09/03/2023   16:58:27   ( -69.83, 101.71) 09/03/2023   16:57:56  ( -69.84, 101.64)    3.01                31
 09/06/2023   07:34:09   ( -70.70,-118.51) 09/06/2023   07:35:17  ( -70.61,-116.64)   69.61                68
 09/06/2023   08:24:41   (  69.96,  49.97) 09/06/2023   08:24:54  (  69.95,  50.04)    3.19                13
 09/06/2023   09:15:22   ( -69.81,-142.50) 09/06/2023   09:14:25  ( -69.79,-142.54)    2.73                57