Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 12.  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)
 02/12/2023   23:01:47   (  70.19,-169.27) 02/12/2023   23:02:59  (  70.15,-169.20)    5.50                72
 02/12/2023   23:52:28   ( -70.05,  -1.73) 02/12/2023   23:52:29  ( -70.03,  -1.73)    2.20                 1
 02/13/2023   00:43:10   (  69.82, 165.91) 02/13/2023   00:41:57  (  69.87, 165.70)   10.03                73
 02/15/2023   15:18:42   (  70.12, -53.39) 02/15/2023   15:19:27  (  70.09, -53.40)    3.39                45
 02/15/2023   16:09:23   ( -69.97, 114.14) 02/15/2023   16:08:57  ( -69.97, 114.07)    2.64                26
 02/18/2023   06:45:07   ( -70.89,-106.18) 02/18/2023   06:46:15  ( -70.79,-104.12)   75.89                68
 02/18/2023   07:35:37   (  70.04,  62.48) 02/18/2023   07:35:54  (  70.02,  62.40)    3.68                17
 02/18/2023   08:26:19   ( -69.95,-130.06) 02/18/2023   08:25:23  ( -69.97,-130.04)    2.02                56
 02/20/2023   23:01:48   ( -70.14,  10.78) 02/20/2023   23:02:51  ( -70.13,  10.80)    1.33                63
 02/20/2023   23:52:32   (  70.03, 178.26) 02/20/2023   23:52:18  (  70.01, 178.28)    1.81                14
 02/21/2023   00:43:06   ( -69.51, -13.66) 02/21/2023   00:41:55  ( -69.52, -14.76)   43.13                71
 02/23/2023   15:18:43   ( -70.07, 126.65) 02/23/2023   15:19:16  ( -70.07, 126.61)    1.48                33
 02/23/2023   16:09:27   (  69.96, -65.88) 02/23/2023   16:08:43  (  69.95, -65.91)    1.73                44