Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 20.  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)
 08/21/2023   07:34:02   ( -70.74,-118.51) 08/21/2023   07:35:10  ( -70.61,-116.63)   70.72                68
 08/21/2023   08:24:33   (  69.94,  50.06) 08/21/2023   08:24:48  (  69.92,  50.00)    3.11                15
 08/21/2023   09:15:14   ( -69.85,-142.50) 08/21/2023   09:14:16  ( -69.86,-142.45)    1.99                58
 08/23/2023   23:50:44   ( -70.01,  -1.59) 08/23/2023   23:51:52  ( -69.99,  -1.66)    3.20                68
 08/24/2023   00:41:28   (  69.88, 165.90) 08/24/2023   00:41:19  (  69.89, 165.84)    2.39                 9
 08/24/2023   01:32:05   ( -69.53, -26.27) 08/24/2023   01:30:53  ( -69.56, -26.98)   27.96                72
 08/26/2023   16:07:41   ( -70.01, 114.16) 08/26/2023   16:08:23  ( -69.99, 114.22)    2.97                42
 08/26/2023   16:58:25   (  69.89, -78.35) 08/26/2023   16:57:50  (  69.89, -78.29)    2.58                35
 08/29/2023   07:34:07   (  70.70,  61.53) 08/29/2023   07:35:15  (  70.56,  63.29)   66.79                68
 08/29/2023   08:24:36   ( -69.92,-129.94) 08/29/2023   08:24:55  ( -69.91,-130.02)    3.05                19
 08/29/2023   09:15:20   (  69.80,  37.54) 08/29/2023   09:14:22  (  69.80,  37.47)    2.64                58
 08/31/2023   23:50:51   (  70.04, 178.33) 08/31/2023   23:51:55  (  70.01, 178.37)    3.01                64
 09/01/2023   00:41:32   ( -69.89, -14.14) 09/01/2023   00:41:25  ( -69.91, -14.14)    2.50                 7
 09/01/2023   01:32:08   (  69.40, 153.89) 09/01/2023   01:30:57  (  69.47, 152.90)   39.29                71