Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 23.  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)
 12/24/2023   15:18:05   ( -70.65, 125.52) 12/24/2023   15:19:13  ( -70.58, 127.37)   68.76                68
 12/24/2023   16:08:37   (  69.91, -66.01) 12/24/2023   16:08:51  (  69.88, -66.00)    3.44                14
 12/24/2023   16:59:18   ( -69.77, 101.52) 12/24/2023   16:58:21  ( -69.76, 101.47)    1.87                57
 12/27/2023   07:34:46   ( -69.97,-117.64) 12/27/2023   07:35:52  ( -69.96,-117.65)    1.79                66
 12/27/2023   08:25:30   (  69.86,  49.84) 12/27/2023   08:25:19  (  69.85,  49.84)    0.80                11
 12/27/2023   09:16:05   ( -69.40,-142.17) 12/27/2023   09:14:54  ( -69.47,-143.05)   35.31                71
 12/29/2023   23:51:40   ( -69.93,  -1.80) 12/29/2023   23:52:20  ( -69.95,  -1.78)    2.45                40
 12/30/2023   00:42:24   (  69.82, 165.67) 12/30/2023   00:41:47  (  69.84, 165.72)    2.98                37
 01/01/2024   15:18:02   (  70.52, -54.27) 01/01/2024   15:19:11  (  70.40, -52.88)   53.39                69
 01/01/2024   16:08:34   ( -69.90, 114.02) 01/01/2024   16:08:48  ( -69.91, 114.05)    1.53                14
 01/01/2024   16:59:18   (  69.79, -78.51) 01/01/2024   16:58:15  (  69.80, -78.46)    1.90                63
 01/04/2024   07:34:46   (  69.98,  62.36) 01/04/2024   07:35:45  (  69.99,  62.42)    2.39                59
 01/04/2024   08:25:27   ( -69.83,-130.10) 01/04/2024   08:25:16  ( -69.83,-130.17)    2.67                11
 01/04/2024   09:16:01   (  69.19,  38.14) 01/04/2024   09:14:51  (  69.27,  36.72)   56.51                70