Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 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)
 01/22/2023   14:28:31   (  71.08, -42.25) 01/22/2023   14:29:37  (  70.95, -39.69)   93.57                66
 01/22/2023   15:18:56   ( -70.10, 126.65) 01/22/2023   15:19:21  ( -70.07, 126.64)    3.34                25
 01/22/2023   16:09:40   (  69.98, -65.87) 01/22/2023   16:08:48  (  69.97, -65.86)    1.32                52
 01/25/2023   06:45:10   (  70.32,  74.75) 01/25/2023   06:46:21  (  70.28,  75.17)   16.49                71
 01/25/2023   07:35:49   ( -70.08,-117.55) 01/25/2023   07:35:53  ( -70.06,-117.51)    2.36                 4
 01/25/2023   08:26:32   (  69.96,  49.93) 01/25/2023   08:25:19  (  69.96,  49.99)    2.26                73
 01/27/2023   23:01:59   (  70.16,-169.22) 01/27/2023   23:02:53  (  70.15,-169.14)    3.01                54
 01/27/2023   23:52:40   ( -70.01,  -1.68) 01/27/2023   23:52:23  ( -70.04,  -1.66)    3.40                17
 01/28/2023   00:43:11   (  69.21, 166.80) 01/28/2023   00:42:03  (  69.22, 164.86)   76.33                68
 01/30/2023   15:18:51   (  70.11, -53.37) 01/30/2023   15:19:23  (  70.12, -53.30)    3.13                32
 01/30/2023   16:09:32   ( -69.96, 114.17) 01/30/2023   16:08:54  ( -69.96, 114.10)    2.53                38
 02/02/2023   06:45:09   ( -70.70,-105.84) 02/02/2023   06:46:18  ( -70.59,-104.39)   54.90                69
 02/02/2023   07:35:43   (  70.07,  62.46) 02/02/2023   07:35:52  (  70.09,  62.53)    3.52                 9
 02/02/2023   08:26:24   ( -69.92,-130.00) 02/02/2023   08:25:23  ( -69.93,-130.06)    2.62                61
 02/04/2023   23:01:51   ( -70.15,  10.81) 02/04/2023   23:02:53  ( -70.17,  10.88)    3.37                62
 02/04/2023   23:52:34   (  69.99, 178.35) 02/04/2023   23:52:21  (  70.00, 178.28)    2.58                13
 02/05/2023   00:43:07   ( -69.47, -13.56) 02/05/2023   00:41:56  ( -69.56, -14.68)   44.71                71