Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 30.  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)
 01/30/2023   15:18:51   (  70.08, -53.32) 01/30/2023   15:19:27  (  70.10, -53.35)    3.24                36
 01/30/2023   16:09:33   ( -69.99, 114.12) 01/30/2023   16:08:57  ( -69.99, 114.12)    0.17                36
 02/02/2023   06:45:12   ( -70.88,-106.13) 02/02/2023   06:46:20  ( -70.74,-104.19)   72.70                68
 02/02/2023   07:35:43   (  70.08,  62.44) 02/02/2023   07:35:57  (  70.09,  62.50)    2.72                14
 02/02/2023   08:26:24   ( -69.94,-130.03) 02/02/2023   08:25:28  ( -69.93,-130.10)    3.04                56
 02/04/2023   23:01:51   ( -70.16,  10.79) 02/04/2023   23:03:01  ( -70.17,  10.83)    1.91                70
 02/04/2023   23:52:35   (  70.04, 178.27) 02/04/2023   23:52:28  (  70.06, 178.33)    2.88                 7
 02/05/2023   00:43:13   ( -69.74, -13.96) 02/05/2023   00:42:01  ( -69.79, -14.42)   18.39                72
 02/07/2023   15:18:43   ( -70.12, 126.62) 02/07/2023   15:19:32  ( -70.12, 126.64)    0.83                49
 02/07/2023   16:09:27   (  70.01, -65.91) 02/07/2023   16:08:59  (  70.01, -65.87)    1.44                28
 02/07/2023   16:59:51   ( -68.96, 102.92) 02/07/2023   16:58:45  ( -69.02, 100.43)   99.25                66
 02/10/2023   07:35:35   ( -70.09,-117.56) 02/10/2023   07:36:02  ( -70.10,-117.51)    1.91                27
 02/10/2023   08:26:19   (  69.99,  49.91) 02/10/2023   08:25:29  (  69.99,  49.97)    2.63                50
 02/12/2023   23:01:48   (  70.39,-169.56) 02/12/2023   23:02:59  (  70.27,-169.02)   23.64                71
 02/12/2023   23:52:26   ( -70.07,  -1.76) 02/12/2023   23:52:31  ( -70.06,  -1.69)    2.95                 5
 02/13/2023   00:43:09   (  69.92, 165.79) 02/13/2023   00:41:58  (  69.95, 165.79)    2.97                71