Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 22.  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)
 12/24/2022   06:45:15   (  70.19,  75.03) 12/24/2022   06:46:23  (  70.17,  75.04)    2.56                68
 12/24/2022   07:35:56   ( -70.05,-117.44) 12/24/2022   07:35:53  ( -70.06,-117.49)    2.00                 3
 12/24/2022   08:26:35   (  69.67,  50.44) 12/24/2022   08:25:24  (  69.73,  49.70)   29.36                71
 12/26/2022   23:02:09   (  70.12,-169.09) 12/26/2022   23:02:51  (  70.12,-169.15)    2.06                42
 12/26/2022   23:52:51   ( -70.03,  -1.64) 12/26/2022   23:52:21  ( -70.01,  -1.67)    2.48                30
 12/29/2022   14:28:33   ( -70.89, 138.12) 12/29/2022   14:29:41  ( -70.75, 140.04)   71.66                68
 12/29/2022   15:19:04   (  70.10, -53.31) 12/29/2022   15:19:18  (  70.09, -53.29)    1.09                14
 12/29/2022   16:09:46   ( -70.01, 114.15) 12/29/2022   16:08:48  ( -69.99, 114.20)    2.64                58
 01/01/2023   06:45:14   ( -70.15,-104.93) 01/01/2023   06:46:18  ( -70.17,-104.94)    2.36                64
 01/01/2023   07:35:58   (  70.04,  62.55) 01/01/2023   07:35:45  (  70.05,  62.54)    1.50                13
 01/01/2023   08:26:32   ( -69.52,-129.37) 01/01/2023   08:25:21  ( -69.62,-130.42)   42.52                71
 01/03/2023   23:02:07   ( -70.09,  10.92) 01/03/2023   23:02:44  ( -70.11,  10.87)    2.97                37
 01/03/2023   23:52:51   (  69.98, 178.39) 01/03/2023   23:52:11  (  69.99, 178.35)    1.89                40