Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 21.  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)
 12/21/2023   23:51:42   (  69.93, 178.19) 12/21/2023   23:52:20  (  69.94, 178.21)    1.68                38
 12/22/2023   00:42:24   ( -69.84, -14.36) 12/22/2023   00:41:50  ( -69.83, -14.31)    2.41                34
 12/24/2023   15:18:04   ( -70.61, 125.58) 12/24/2023   15:19:13  ( -70.52, 127.28)   63.70                69
 12/24/2023   16:08:36   (  69.87, -65.95) 12/24/2023   16:08:50  (  69.87, -66.01)    2.46                14
 12/24/2023   16:59:18   ( -69.78, 101.50) 12/24/2023   16:58:20  ( -69.76, 101.47)    2.84                58
 12/27/2023   07:34:47   ( -69.98,-117.66) 12/27/2023   07:35:51  ( -69.98,-117.62)    1.61                64
 12/27/2023   08:25:31   (  69.87,  49.82) 12/27/2023   08:25:18  (  69.87,  49.87)    1.93                13
 12/27/2023   09:16:05   ( -69.36,-142.11) 12/27/2023   09:14:54  ( -69.43,-143.09)   39.41                71
 12/29/2023   23:51:41   ( -69.94,  -1.82) 12/29/2023   23:52:19  ( -69.95,  -1.78)    1.57                38
 12/30/2023   00:42:25   (  69.83, 165.66) 12/30/2023   00:41:46  (  69.83, 165.71)    2.09                39
 01/01/2024   15:18:00   (  70.43, -54.11) 01/01/2024   15:19:10  (  70.31, -52.99)   43.72                70
 01/01/2024   16:08:33   ( -69.86, 114.08) 01/01/2024   16:08:46  ( -69.88, 114.02)    3.32                13
 01/01/2024   16:59:17   (  69.75, -78.44) 01/01/2024   16:58:13  (  69.76, -78.49)    2.58                64