Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 13.  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)
 12/13/2023   23:51:40   ( -69.92,  -1.79) 12/13/2023   23:52:20  ( -69.92,  -1.82)    1.24                40
 12/14/2023   00:42:24   (  69.81, 165.69) 12/14/2023   00:41:47  (  69.81, 165.68)    0.72                37
 12/16/2023   15:18:04   (  70.55, -54.32) 12/16/2023   15:19:13  (  70.44, -52.83)   56.86                69
 12/16/2023   16:08:35   ( -69.88, 114.04) 12/16/2023   16:08:51  ( -69.89, 114.02)    1.89                16
 12/16/2023   16:59:18   (  69.76, -78.48) 12/16/2023   16:58:17  (  69.79, -78.48)    2.37                61
 12/19/2023   07:34:47   (  69.94,  62.41) 12/19/2023   07:35:51  (  69.95,  62.35)    2.94                64
 12/19/2023   08:25:29   ( -69.84,-130.13) 12/19/2023   08:25:21  ( -69.85,-130.17)    1.63                 8
 12/19/2023   09:16:05   (  69.30,  37.96) 12/19/2023   09:14:55  (  69.35,  36.80)   45.62                70
 12/21/2023   23:51:42   (  69.91, 178.22) 12/21/2023   23:52:21  (  69.94, 178.20)    3.36                39
 12/22/2023   00:42:24   ( -69.81, -14.31) 12/22/2023   00:41:51  ( -69.83, -14.31)    2.74                33
 12/24/2023   15:18:06   ( -70.67, 125.49) 12/24/2023   15:19:14  ( -70.56, 127.34)   69.37                68
 12/24/2023   16:08:37   (  69.88, -65.97) 12/24/2023   16:08:51  (  69.90, -65.97)    1.59                14
 12/24/2023   16:59:19   ( -69.78, 101.50) 12/24/2023   16:58:21  ( -69.80, 101.52)    1.78                58