Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 19.  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)
 01/19/2023   23:02:02   ( -70.10,  10.88) 01/19/2023   23:02:49  ( -70.10,  10.81)    2.64                47
 01/19/2023   23:52:46   (  69.98, 178.36) 01/19/2023   23:52:16  (  69.99, 178.30)    2.54                30
 01/22/2023   14:28:26   (  70.84, -41.85) 01/22/2023   14:29:34  (  70.74, -39.98)   69.19                68
 01/22/2023   15:18:55   ( -70.07, 126.70) 01/22/2023   15:19:14  ( -70.08, 126.68)    1.79                19
 01/22/2023   16:09:39   (  69.95, -65.82) 01/22/2023   16:08:41  (  69.97, -65.83)    2.27                58
 01/25/2023   06:45:06   (  70.14,  75.04) 01/25/2023   06:46:09  (  70.13,  75.02)    1.08                63
 01/25/2023   07:35:48   ( -70.05,-117.50) 01/25/2023   07:35:39  ( -70.02,-117.50)    2.90                 9
 01/25/2023   08:26:23   (  69.46,  50.67) 01/25/2023   08:25:13  (  69.52,  49.46)   48.04                70
 01/27/2023   23:01:58   (  70.08,-169.10) 01/27/2023   23:02:33  (  70.08,-169.15)    1.93                35
 01/27/2023   23:52:40   ( -69.99,  -1.64) 01/27/2023   23:52:03  ( -69.97,  -1.67)    2.49                37
 01/30/2023   14:28:12   ( -70.52, 138.69) 01/30/2023   14:29:23  ( -70.42, 139.61)   35.80                71
 01/30/2023   15:18:49   (  70.04, -53.27) 01/30/2023   15:18:55  (  70.03, -53.31)    1.93                 6
 01/30/2023   16:09:31   ( -69.95, 114.19) 01/30/2023   16:08:25  ( -69.93, 114.17)    2.40                66