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   (  70.17,  75.06) 12/24/2022   06:46:23  (  70.19,  75.08)    2.82                68
 12/24/2022   07:35:57   ( -70.08,-117.48) 12/24/2022   07:35:53  ( -70.08,-117.45)    1.21                 4
 12/24/2022   08:26:36   (  69.70,  50.40) 12/24/2022   08:25:24  (  69.76,  49.74)   26.26                72
 12/26/2022   23:02:10   (  70.15,-169.14) 12/26/2022   23:02:51  (  70.14,-169.11)    1.40                41
 12/26/2022   23:52:51   ( -70.01,  -1.61) 12/26/2022   23:52:21  ( -70.03,  -1.64)    3.00                30
 12/29/2022   14:28:32   ( -70.88, 138.15) 12/29/2022   14:29:40  ( -70.78, 140.08)   71.11                68
 12/29/2022   15:19:03   (  70.08, -53.28) 12/29/2022   15:19:18  (  70.07, -53.33)    2.37                15
 12/29/2022   16:09:45   ( -69.99, 114.18) 12/29/2022   16:08:48  ( -69.96, 114.16)    3.26                57
 01/01/2023   06:45:13   ( -70.13,-104.90) 01/01/2023   06:46:18  ( -70.14,-104.97)    2.93                65
 01/01/2023   07:35:57   (  70.02,  62.57) 01/01/2023   07:35:45  (  70.03,  62.51)    2.53                12
 01/01/2023   08:26:32   ( -69.56,-129.42) 01/01/2023   08:25:21  ( -69.60,-130.46)   40.46                71
 01/03/2023   23:02:08   ( -70.13,  10.86) 01/03/2023   23:02:44  ( -70.14,  10.92)    2.46                36
 01/03/2023   23:52:52   (  70.02, 178.33) 01/03/2023   23:52:11  (  70.03, 178.40)    2.34                41