Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 5.  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)
 12/05/2023   23:51:38   (  69.91, 178.22) 12/05/2023   23:52:15  (  69.90, 178.18)    2.02                37
 12/06/2023   00:42:20   ( -69.82, -14.32) 12/06/2023   00:41:44  ( -69.84, -14.27)    3.15                36
 12/08/2023   15:17:58   ( -70.44, 125.87) 12/08/2023   15:19:08  ( -70.35, 127.07)   45.67                70
 12/08/2023   16:08:33   (  69.85, -65.92) 12/08/2023   16:08:42  (  69.86, -65.98)    2.60                 9
 12/08/2023   16:59:15   ( -69.76, 101.54) 12/08/2023   16:58:12  ( -69.75, 101.50)    1.85                63
 12/11/2023   07:34:45   ( -69.97,-117.63) 12/11/2023   07:35:41  ( -69.95,-117.60)    1.50                56
 12/11/2023   08:25:29   (  69.86,  49.84) 12/11/2023   08:25:08  (  69.84,  49.89)    2.29                21
 12/11/2023   09:15:58   ( -69.07,-141.70) 12/11/2023   09:14:49  ( -69.13,-143.44)   69.20                69
 12/13/2023   23:51:40   ( -69.93,  -1.80) 12/13/2023   23:52:07  ( -69.90,  -1.78)    2.91                27
 12/14/2023   00:42:23   (  69.77, 165.75) 12/14/2023   00:41:34  (  69.79, 165.71)    2.66                49
 12/16/2023   15:17:51   (  69.95, -53.38) 12/16/2023   15:19:01  (  69.97, -53.41)    2.87                70
 12/16/2023   16:08:33   ( -69.85, 114.09) 12/16/2023   16:08:31  ( -69.87, 114.07)    2.31                 2
 12/16/2023   16:59:13   (  69.53, -78.13) 12/16/2023   16:58:01  (  69.58, -78.67)   21.74                72