Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 18.  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)
 12/18/2022   23:51:09   (  70.25, 178.48) 12/18/2022   23:52:21  (  70.22, 178.63)    6.59                72
 12/19/2022   00:41:41   ( -70.12, -13.95) 12/19/2022   00:41:51  ( -70.11, -13.90)    2.14                10
 12/19/2022   01:32:24   (  69.98, 153.57) 12/19/2022   01:31:18  (  70.01, 153.60)    3.06                66
 12/21/2022   20:15:07   ( -70.16,  52.63) 12/21/2022   20:16:03  ( -70.16,  52.62)    0.98                56
 12/21/2022   21:05:50   (  70.04,-139.88) 12/21/2022   21:05:30  (  70.06,-139.89)    1.58                20
 12/21/2022   21:56:17   ( -69.62,  28.10) 12/21/2022   21:55:05  ( -69.67,  27.21)   35.06                72
 12/24/2022   16:39:17   (  70.13, -73.36) 12/24/2022   16:39:42  (  70.14, -73.32)    2.19                25
 12/24/2022   17:29:51   ( -70.04,  94.12) 12/24/2022   17:29:12  ( -70.03,  94.15)    1.84                39
 12/27/2022   12:12:43   (  70.17,  -6.79) 12/27/2022   12:13:54  (  70.20,  -6.79)    3.01                71
 12/27/2022   13:03:18   ( -70.11, 160.65) 12/27/2022   13:03:24  ( -70.10, 160.69)    2.30                 6
 12/27/2022   13:54:00   (  70.01, -31.87) 12/27/2022   13:52:51  (  69.98, -31.82)    3.22                69
 12/30/2022   08:36:43   ( -70.15,-132.75) 12/30/2022   08:37:35  ( -70.14,-132.80)    2.22                52
 12/30/2022   09:27:25   (  70.08,  34.68) 12/30/2022   09:27:01  (  70.08,  34.76)    2.98                24
 12/30/2022   10:17:50   ( -69.45,-157.05) 12/30/2022   10:16:40  ( -69.48,-158.43)   53.89                70