Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 6.  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)
 12/08/2023   15:17:58   ( -70.45, 125.85) 12/08/2023   15:19:08  ( -70.34, 127.05)   46.42                70
 12/08/2023   16:08:33   (  69.87, -65.94) 12/08/2023   16:08:42  (  69.85, -66.00)    2.81                 9
 12/08/2023   16:59:15   ( -69.77, 101.52) 12/08/2023   16:58:11  ( -69.79, 101.55)    2.76                64
 12/11/2023   07:34:44   ( -69.92,-117.56) 12/11/2023   07:35:41  ( -69.95,-117.61)    3.16                57
 12/11/2023   08:25:28   (  69.82,  49.91) 12/11/2023   08:25:08  (  69.84,  49.88)    2.73                20
 12/11/2023   09:15:58   ( -69.08,-141.72) 12/11/2023   09:14:49  ( -69.12,-143.45)   68.75                69
 12/13/2023   23:51:39   ( -69.88,  -1.73) 12/13/2023   23:52:07  ( -69.90,  -1.78)    2.99                28
 12/14/2023   00:42:23   (  69.78, 165.74) 12/14/2023   00:41:34  (  69.79, 165.71)    2.04                49
 12/16/2023   15:17:53   (  70.01, -53.47) 12/16/2023   15:19:02  (  69.99, -53.39)    3.36                69
 12/16/2023   16:08:34   ( -69.85, 114.08) 12/16/2023   16:08:33  ( -69.83, 114.02)    3.54                 1
 12/16/2023   16:59:14   (  69.54, -78.14) 12/16/2023   16:58:02  (  69.60, -78.65)   21.13                72
 12/19/2023   07:34:46   (  69.94,  62.41) 12/19/2023   07:35:26  (  69.94,  62.44)    0.92                40
 12/19/2023   08:25:28   ( -69.83,-130.11) 12/19/2023   08:24:56  ( -69.83,-130.08)    1.44                32