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, 178.18) 12/21/2023   23:52:20  (  69.94, 178.21)    1.56                38
 12/22/2023   00:42:24   ( -69.84, -14.37) 12/22/2023   00:41:50  ( -69.83, -14.32)    2.70                34
 12/24/2023   15:18:04   ( -70.62, 125.58) 12/24/2023   15:19:13  ( -70.52, 127.28)   63.85                69
 12/24/2023   16:08:36   (  69.87, -65.95) 12/24/2023   16:08:50  (  69.87, -66.01)    2.44                14
 12/24/2023   16:59:18   ( -69.78, 101.50) 12/24/2023   16:58:20  ( -69.75, 101.47)    3.22                58
 12/27/2023   07:34:47   ( -69.99,-117.66) 12/27/2023   07:35:51  ( -69.97,-117.62)    2.01                64
 12/27/2023   08:25:31   (  69.87,  49.82) 12/27/2023   08:25:18  (  69.87,  49.87)    2.08                13
 12/27/2023   09:16:05   ( -69.36,-142.11) 12/27/2023   09:14:54  ( -69.43,-143.09)   39.25                71
 12/29/2023   23:51:41   ( -69.95,  -1.82) 12/29/2023   23:52:19  ( -69.94,  -1.78)    1.61                38
 12/30/2023   00:42:25   (  69.83, 165.65) 12/30/2023   00:41:46  (  69.83, 165.71)    2.08                39
 01/01/2024   15:18:00   (  70.43, -54.12) 01/01/2024   15:19:10  (  70.31, -53.00)   43.86                70
 01/01/2024   16:08:33   ( -69.86, 114.08) 01/01/2024   16:08:46  ( -69.88, 114.01)    2.86                13
 01/01/2024   16:59:17   (  69.75, -78.45) 01/01/2024   16:58:13  (  69.76, -78.50)    2.23                64
 01/04/2024   07:34:45   (  69.94,  62.42) 01/04/2024   07:35:43  (  69.93,  62.35)    2.79                58
 01/04/2024   08:25:27   ( -69.84,-130.12) 01/04/2024   08:25:13  ( -69.83,-130.16)    2.21                14
 01/04/2024   09:15:59   (  69.09,  38.27) 01/04/2024   09:14:50  (  69.16,  36.59)   67.08                69