Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 25.  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)
 01/25/2023   06:45:10   (  70.33,  74.74) 01/25/2023   06:46:22  (  70.24,  75.12)   17.35                72
 01/25/2023   07:35:49   ( -70.09,-117.57) 01/25/2023   07:35:53  ( -70.07,-117.49)    3.34                 4
 01/25/2023   08:26:32   (  69.92,  50.00) 01/25/2023   08:25:21  (  69.92,  49.94)    2.35                71
 01/27/2023   23:01:58   (  70.12,-169.15) 01/27/2023   23:02:55  (  70.11,-169.21)    2.27                57
 01/27/2023   23:52:40   ( -70.03,  -1.70) 01/27/2023   23:52:24  ( -70.05,  -1.66)    3.23                16
 01/28/2023   00:43:11   (  69.22, 166.78) 01/28/2023   00:42:03  (  69.29, 164.95)   72.68                68
 01/30/2023   15:18:51   (  70.12, -53.39) 01/30/2023   15:19:26  (  70.10, -53.35)    2.97                35
 01/30/2023   16:09:32   ( -69.98, 114.14) 01/30/2023   16:08:56  ( -69.99, 114.13)    1.47                36
 02/02/2023   06:45:11   ( -70.82,-106.04) 02/02/2023   06:46:19  ( -70.76,-104.15)   69.53                68
 02/02/2023   07:35:42   (  70.04,  62.51) 02/02/2023   07:35:57  (  70.05,  62.45)    2.91                15
 02/02/2023   08:26:24   ( -69.94,-130.03) 02/02/2023   08:25:27  ( -69.94,-130.06)    1.46                57
 02/04/2023   23:01:50   ( -70.12,  10.85) 02/04/2023   23:03:00  ( -70.13,  10.79)    2.43                70
 02/04/2023   23:52:34   (  70.01, 178.32) 02/04/2023   23:52:27  (  70.02, 178.28)    1.55                 7
 02/05/2023   00:43:12   ( -69.71, -13.90) 02/05/2023   00:42:00  ( -69.75, -14.46)   21.94                72
 02/07/2023   15:18:41   ( -70.11, 126.64) 02/07/2023   15:19:28  ( -70.11, 126.65)    0.78                47
 02/07/2023   16:09:25   (  70.01, -65.89) 02/07/2023   16:08:55  (  70.00, -65.86)    1.19                30