Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 17.  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)
 02/18/2023   06:45:06   ( -70.92,-106.22) 02/18/2023   06:46:14  ( -70.81,-104.09)   78.43                68
 02/18/2023   07:35:36   (  70.07,  62.44) 02/18/2023   07:35:53  (  70.05,  62.44)    1.77                17
 02/18/2023   08:26:17   ( -69.92,-130.02) 02/18/2023   08:25:23  ( -69.93,-130.09)    2.83                54
 02/20/2023   23:01:47   ( -70.15,  10.77) 02/20/2023   23:02:51  ( -70.15,  10.83)    2.30                64
 02/20/2023   23:52:31   (  70.04, 178.25) 02/20/2023   23:52:18  (  70.04, 178.32)    2.82                13
 02/21/2023   00:43:05   ( -69.52, -13.67) 02/21/2023   00:41:54  ( -69.60, -14.66)   39.31                71
 02/23/2023   15:18:41   ( -70.08, 126.64) 02/23/2023   15:19:16  ( -70.09, 126.64)    1.07                35
 02/23/2023   16:09:25   (  69.97, -65.89) 02/23/2023   16:08:43  (  69.98, -65.87)    1.22                42
 02/26/2023   06:44:57   (  70.34,  74.68) 02/26/2023   06:46:08  (  70.25,  75.14)   19.80                71
 02/26/2023   07:35:35   ( -70.03,-117.52) 02/26/2023   07:35:40  ( -70.03,-117.54)    0.65                 5
 02/26/2023   08:26:19   (  69.93,  49.95) 02/26/2023   08:25:07  (  69.92,  49.95)    0.73                72
 02/28/2023   23:01:46   (  70.10,-169.17) 02/28/2023   23:02:32  (  70.08,-169.20)    2.12                46
 02/28/2023   23:52:28   ( -70.00,  -1.70) 02/28/2023   23:52:02  ( -69.97,  -1.72)    2.69                26