Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 9.  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)
 02/10/2023   06:45:10   (  71.10,  73.50) 02/10/2023   06:46:16  (  71.01,  76.21)   98.54                66
 02/10/2023   07:35:34   ( -70.07,-117.53) 02/10/2023   07:36:01  ( -70.07,-117.55)    0.94                27
 02/10/2023   08:26:18   (  69.95,  49.96) 02/10/2023   08:25:28  (  69.97,  49.95)    2.02                50
 02/12/2023   23:01:46   (  70.32,-169.45) 02/12/2023   23:02:57  (  70.24,-169.07)   16.74                71
 02/12/2023   23:52:25   ( -70.07,  -1.75) 02/12/2023   23:52:28  ( -70.07,  -1.68)    2.77                 3
 02/13/2023   00:43:08   (  69.90, 165.81) 02/13/2023   00:41:56  (  69.91, 165.74)    2.58                72
 02/15/2023   15:18:34   (  70.12, -53.37) 02/15/2023   15:19:26  (  70.12, -53.35)    0.85                52
 02/15/2023   16:09:16   ( -70.03, 114.09) 02/15/2023   16:08:56  ( -70.01, 114.13)    2.93                20
 02/15/2023   16:59:44   (  69.07, -77.21) 02/15/2023   16:58:37  (  69.13, -79.42)   87.70                67
 02/18/2023   07:35:24   (  70.05,  62.52) 02/18/2023   07:35:53  (  70.06,  62.46)    2.67                29
 02/18/2023   08:26:06   ( -69.96,-130.02) 02/18/2023   08:25:23  ( -69.96,-130.06)    1.38                43
 02/20/2023   23:01:37   ( -70.47,  10.35) 02/20/2023   23:02:48  ( -70.34,  11.11)   31.69                71
 02/20/2023   23:52:15   (  70.05, 178.30) 02/20/2023   23:52:18  (  70.07, 178.36)    2.72                 3
 02/21/2023   00:42:57   ( -69.95, -14.23) 02/21/2023   00:41:48  ( -69.96, -14.16)    2.84                69
 02/23/2023   15:18:20   ( -70.11, 126.68) 02/23/2023   15:19:15  ( -70.13, 126.70)    2.51                55
 02/23/2023   16:09:04   (  70.01, -65.85) 02/23/2023   16:08:42  (  70.01, -65.82)    1.39                22