Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 11 30.  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)
 11/30/2023   15:18:01   (  70.72, -54.57) 11/30/2023   15:19:08  (  70.63, -52.54)   75.16                67
 11/30/2023   16:08:29   ( -69.88, 114.06) 11/30/2023   16:08:49  ( -69.91, 114.05)    3.06                20
 11/30/2023   16:59:13   (  69.77, -78.47) 11/30/2023   16:58:17  (  69.75, -78.52)    2.96                56
 12/03/2023   07:34:43   (  69.95,  62.41) 12/03/2023   07:35:48  (  69.96,  62.37)    2.01                65
 12/03/2023   08:25:25   ( -69.85,-130.13) 12/03/2023   08:25:18  ( -69.85,-130.15)    0.95                 7
 12/03/2023   09:16:02   (  69.37,  37.89) 12/03/2023   09:14:51  (  69.41,  36.90)   38.96                71
 12/05/2023   23:51:39   (  69.93, 178.20) 12/05/2023   23:52:16  (  69.90, 178.18)    3.29                37
 12/06/2023   00:42:21   ( -69.83, -14.33) 12/06/2023   00:41:45  ( -69.85, -14.26)    3.27                36
 12/08/2023   15:17:58   ( -70.45, 125.85) 12/08/2023   15:19:08  ( -70.35, 127.06)   46.69                70
 12/08/2023   16:08:33   (  69.87, -65.95) 12/08/2023   16:08:42  (  69.85, -66.00)    3.43                 9
 12/08/2023   16:59:15   ( -69.77, 101.52) 12/08/2023   16:58:11  ( -69.80, 101.56)    3.19                64
 12/11/2023   07:34:44   ( -69.94,-117.58) 12/11/2023   07:35:41  ( -69.92,-117.65)    3.14                57
 12/11/2023   08:25:28   (  69.84,  49.88) 12/11/2023   08:25:07  (  69.86,  49.91)    2.99                21
 12/11/2023   09:15:57   ( -69.04,-141.66) 12/11/2023   09:14:49  ( -69.09,-143.48)   72.46                68
 12/13/2023   23:51:39   ( -69.91,  -1.77) 12/13/2023   23:52:06  ( -69.89,  -1.80)    3.05                27
 12/14/2023   00:42:23   (  69.81, 165.69) 12/14/2023   00:41:32  (  69.82, 165.76)    3.12                51