Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 7.  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)
 12/08/2023   15:17:59   ( -70.46, 125.84) 12/08/2023   15:19:09  ( -70.33, 127.04)   46.97                70
 12/08/2023   16:08:34   (  69.87, -65.95) 12/08/2023   16:08:42  (  69.90, -65.93)    3.00                 8
 12/08/2023   16:59:15   ( -69.78, 101.51) 12/08/2023   16:58:11  ( -69.78, 101.54)    1.38                64
 12/11/2023   07:34:44   ( -69.93,-117.57) 12/11/2023   07:35:41  ( -69.95,-117.62)    2.66                57
 12/11/2023   08:25:28   (  69.82,  49.90) 12/11/2023   08:25:08  (  69.84,  49.88)    2.49                20
 12/11/2023   09:15:58   ( -69.09,-141.73) 12/11/2023   09:14:49  ( -69.12,-143.45)   68.47                69
 12/13/2023   23:51:40   ( -69.93,  -1.81) 12/13/2023   23:52:07  ( -69.92,  -1.76)    2.47                27
 12/14/2023   00:42:24   (  69.83, 165.66) 12/14/2023   00:41:34  (  69.81, 165.73)    3.34                50
 12/16/2023   15:17:53   (  70.00, -53.45) 12/16/2023   15:19:03  (  69.97, -53.42)    2.71                70
 12/16/2023   16:08:34   ( -69.84, 114.10) 12/16/2023   16:08:33  ( -69.87, 114.06)    3.01                 1
 12/16/2023   16:59:15   (  69.58, -78.20) 12/16/2023   16:58:02  (  69.64, -78.60)   17.09                73
 12/19/2023   07:34:47   (  69.91,  62.45) 12/19/2023   07:35:28  (  69.94,  62.44)    3.53                41
 12/19/2023   08:25:29   ( -69.81,-130.08) 12/19/2023   08:24:58  ( -69.84,-130.07)    3.18                31