Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 26.  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)
 09/27/2023   16:07:47   ( -69.96, 114.17) 09/27/2023   16:08:29  ( -69.95, 114.16)    0.74                42
 09/27/2023   16:58:31   (  69.83, -78.33) 09/27/2023   16:57:56  (  69.84, -78.34)    1.48                35
 09/30/2023   07:34:09   (  70.53,  61.72) 09/30/2023   07:35:18  (  70.44,  63.13)   53.43                69
 09/30/2023   08:24:41   ( -69.92,-130.01) 09/30/2023   08:24:55  ( -69.95,-129.94)    3.55                14
 09/30/2023   09:15:25   (  69.80,  37.48) 09/30/2023   09:14:23  (  69.78,  37.47)    2.42                62
 10/02/2023   23:50:53   (  69.99, 178.34) 10/02/2023   23:51:51  (  70.01, 178.41)    3.26                58
 10/03/2023   00:41:34   ( -69.85, -14.13) 10/03/2023   00:41:22  ( -69.85, -14.18)    2.11                12
 10/03/2023   01:32:07   (  69.15, 154.19) 10/03/2023   01:30:58  (  69.23, 152.63)   62.35                69
 10/05/2023   16:07:46   (  69.93, -65.80) 10/05/2023   16:08:17  (  69.92, -65.81)    1.49                31
 10/05/2023   16:58:28   ( -69.84, 101.66) 10/05/2023   16:57:47  ( -69.82, 101.68)    2.98                41
 10/08/2023   07:33:59   ( -70.26,-117.83) 10/08/2023   07:35:11  ( -70.13,-117.25)   26.17                72
 10/08/2023   08:24:38   (  69.89,  50.04) 10/08/2023   08:24:40  (  69.90,  50.07)    1.85                 2
 10/08/2023   09:15:20   ( -69.79,-142.50) 10/08/2023   09:14:10  ( -69.80,-142.44)    2.42                70