Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 9.  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)
 12/11/2023   07:34:45   ( -69.96,-117.62) 12/11/2023   07:35:48  ( -69.98,-117.59)    2.86                63
 12/11/2023   08:25:29   (  69.85,  49.86) 12/11/2023   08:25:16  (  69.83,  49.83)    2.63                13
 12/11/2023   09:16:03   ( -69.33,-142.07) 12/11/2023   09:14:52  ( -69.39,-143.13)   42.18                71
 12/13/2023   23:51:40   ( -69.91,  -1.77) 12/13/2023   23:52:20  ( -69.93,  -1.79)    3.05                40
 12/14/2023   00:42:24   (  69.80, 165.70) 12/14/2023   00:41:47  (  69.83, 165.70)    3.37                37
 12/16/2023   15:18:03   (  70.54, -54.30) 12/16/2023   15:19:12  (  70.46, -52.79)   56.68                69
 12/16/2023   16:08:35   ( -69.91, 113.99) 12/16/2023   16:08:50  ( -69.92, 114.06)    2.86                15
 12/16/2023   16:59:18   (  69.75, -78.46) 12/16/2023   16:58:18  (  69.75, -78.52)    2.41                60
 12/19/2023   07:34:48   (  69.97,  62.35) 12/19/2023   07:35:51  (  69.99,  62.40)    2.52                63
 12/19/2023   08:25:30   ( -69.87,-130.18) 12/19/2023   08:25:21  ( -69.89,-130.11)    3.19                 9
 12/19/2023   09:16:06   (  69.34,  37.91) 12/19/2023   09:14:55  (  69.39,  36.86)   41.47                71
 12/21/2023   23:51:43   (  69.94, 178.17) 12/21/2023   23:52:22  (  69.94, 178.20)    1.20                39
 12/22/2023   00:42:25   ( -69.84, -14.36) 12/22/2023   00:41:52  ( -69.84, -14.30)    2.12                33