Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 23.  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,  75.05)    1.70                68
 12/24/2022   07:35:56   ( -70.05,-117.44) 12/24/2022   07:35:53  ( -70.06,-117.48)    2.11                 3
 12/24/2022   08:26:36   (  69.72,  50.37) 12/24/2022   08:25:24  (  69.73,  49.71)   25.55                72
 12/26/2022   23:02:09   (  70.11,-169.09) 12/26/2022   23:02:51  (  70.12,-169.14)    2.17                42
 12/26/2022   23:52:51   ( -70.02,  -1.64) 12/26/2022   23:52:21  ( -70.01,  -1.67)    2.20                30
 12/29/2022   14:28:33   ( -70.89, 138.12) 12/29/2022   14:29:41  ( -70.75, 140.04)   71.59                68
 12/29/2022   15:19:04   (  70.10, -53.30) 12/29/2022   15:19:18  (  70.10, -53.28)    0.79                14
 12/29/2022   16:09:46   ( -70.01, 114.15) 12/29/2022   16:08:48  ( -69.99, 114.20)    2.37                58
 01/01/2023   06:45:14   ( -70.15,-104.92) 01/01/2023   06:46:18  ( -70.17,-104.93)    2.84                64
 01/01/2023   07:35:57   (  70.04,  62.55) 01/01/2023   07:35:44  (  70.06,  62.55)    2.51                13
 01/01/2023   08:26:31   ( -69.52,-129.36) 01/01/2023   08:25:20  ( -69.62,-130.42)   42.64                71
 01/03/2023   23:02:08   ( -70.14,  10.85) 01/03/2023   23:02:44  ( -70.11,  10.87)    3.20                36
 01/03/2023   23:52:51   (  69.98, 178.40) 01/03/2023   23:52:11  (  70.00, 178.35)    2.58                40
 01/06/2023   14:28:26   (  70.50, -41.27) 01/06/2023   14:29:37  (  70.35, -40.52)   32.81                71
 01/06/2023   15:19:02   ( -70.09, 126.69) 01/06/2023   15:19:10  ( -70.09, 126.73)    1.51                 8
 01/06/2023   16:09:46   (  69.98, -65.84) 01/06/2023   16:08:37  (  69.97, -65.79)    2.46                69