Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 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)
 12/11/2023   07:34:45   ( -69.99,-117.66) 12/11/2023   07:35:48  ( -69.96,-117.63)    3.16                63
 12/11/2023   08:25:29   (  69.87,  49.82) 12/11/2023   08:25:15  (  69.85,  49.87)    2.96                14
 12/11/2023   09:16:03   ( -69.36,-142.11) 12/11/2023   09:14:52  ( -69.36,-143.16)   41.53                71
 12/13/2023   23:51:40   ( -69.94,  -1.81) 12/13/2023   23:52:20  ( -69.91,  -1.83)    3.42                40
 12/14/2023   00:42:24   (  69.83, 165.66) 12/14/2023   00:41:47  (  69.80, 165.66)    3.25                37
 12/16/2023   15:18:04   (  70.57, -54.35) 12/16/2023   15:19:13  (  70.43, -52.84)   58.54                69
 12/16/2023   16:08:35   ( -69.89, 114.02) 12/16/2023   16:08:51  ( -69.89, 114.02)    0.76                16
 12/16/2023   16:59:19   (  69.79, -78.51) 12/16/2023   16:58:18  (  69.78, -78.49)    1.42                61
 12/19/2023   07:34:48   (  69.96,  62.37) 12/19/2023   07:35:52  (  69.95,  62.35)    1.68                64
 12/19/2023   08:25:30   ( -69.86,-130.16) 12/19/2023   08:25:22  ( -69.85,-130.16)    1.26                 8
 12/19/2023   09:16:06   (  69.33,  37.92) 12/19/2023   09:14:55  (  69.40,  36.88)   41.79                71
 12/21/2023   23:51:42   (  69.94, 178.18) 12/21/2023   23:52:21  (  69.94, 178.22)    1.51                39
 12/22/2023   00:42:24   ( -69.83, -14.35) 12/22/2023   00:41:51  ( -69.84, -14.29)    2.57                33