Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 28.  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)
 12/29/2023   23:51:40   ( -69.93,  -1.80) 12/29/2023   23:52:20  ( -69.95,  -1.78)    2.46                40
 12/30/2023   00:42:24   (  69.81, 165.69) 12/30/2023   00:41:48  (  69.79, 165.64)    2.72                36
 01/01/2024   15:18:02   (  70.51, -54.25) 01/01/2024   15:19:11  (  70.40, -52.88)   52.58                69
 01/01/2024   16:08:34   ( -69.90, 114.02) 01/01/2024   16:08:48  ( -69.91, 114.04)    1.06                14
 01/01/2024   16:59:18   (  69.78, -78.50) 01/01/2024   16:58:15  (  69.80, -78.46)    2.18                63
 01/04/2024   07:34:45   (  69.97,  62.37) 01/04/2024   07:35:44  (  69.99,  62.42)    2.66                59
 01/04/2024   08:25:27   ( -69.88,-130.17) 01/04/2024   08:25:14  ( -69.88,-130.10)    2.79                13
 01/04/2024   09:16:00   (  69.18,  38.15) 01/04/2024   09:14:51  (  69.22,  36.65)   59.43                69
 01/06/2024   23:51:38   (  69.91, 178.24) 01/06/2024   23:52:11  (  69.93, 178.22)    1.76                33
 01/07/2024   00:42:20   ( -69.82, -14.31) 01/07/2024   00:41:41  ( -69.82, -14.29)    0.47                39
 01/09/2024   15:17:54   ( -70.34, 126.05) 01/09/2024   15:19:05  ( -70.27, 126.96)   35.14                71
 01/09/2024   16:08:31   (  69.86, -65.91) 01/09/2024   16:08:37  (  69.88, -65.94)    2.63                 6
 01/09/2024   16:59:13   ( -69.77, 101.55) 01/09/2024   16:58:07  ( -69.78, 101.54)    0.84                66