Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2024 12 18.  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)
 12/18/2024   13:39:08   (  70.23, -28.44) 12/18/2024   13:40:13  (  70.25, -28.37)    2.95                65
 12/18/2024   14:29:50   ( -70.12, 139.05) 12/18/2024   14:29:43  ( -70.13, 139.10)    2.15                 7
 12/18/2024   15:20:27   (  69.66, -52.95) 12/18/2024   15:19:16  (  69.70, -53.86)   35.41                71
 12/21/2024   05:55:59   (  70.21,  87.38) 12/21/2024   05:56:43  (  70.18,  87.41)    3.32                44
 12/21/2024   06:46:41   ( -70.10,-105.13) 12/21/2024   06:46:13  ( -70.07,-105.11)    3.24                28
 12/23/2024   21:22:23   ( -71.17,  34.29) 12/23/2024   21:23:29  ( -71.09,  37.03)   98.90                66
 12/23/2024   22:12:49   (  70.14,-156.73) 12/23/2024   22:13:11  (  70.17,-156.72)    3.12                22
 12/23/2024   23:03:31   ( -70.03,  10.76) 12/23/2024   23:02:41  ( -70.06,  10.76)    3.43                50
 12/26/2024   13:38:58   ( -70.39, 151.36) 12/26/2024   13:40:09  ( -70.33, 151.76)   16.19                71
 12/26/2024   14:29:38   (  70.09, -40.87) 12/26/2024   14:29:38  (  70.11, -40.91)    2.67                 0
 12/26/2024   15:20:21   ( -70.03, 126.54) 12/26/2024   15:19:08  ( -70.00, 126.57)    3.29                73
 12/29/2024   05:55:45   ( -70.19, -92.55) 12/29/2024   05:56:38  ( -70.17, -92.58)    2.89                53
 12/29/2024   06:46:28   (  70.05,  74.97) 12/29/2024   06:46:05  (  70.05,  74.90)    2.75                23
 12/29/2024   07:36:56   ( -69.20,-116.47) 12/29/2024   07:35:48  ( -69.23,-118.59)   83.72                68
 12/31/2024   22:12:35   ( -70.17,  23.27) 12/31/2024   22:13:03  ( -70.17,  23.32)    2.05                28
 12/31/2024   23:03:18   (  70.03,-169.21) 12/31/2024   23:02:30  (  70.05,-169.20)    2.92                48