Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 24.  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   ( -70.66, 125.50) 12/24/2023   15:19:13  ( -70.57, 127.35)   69.07                68
 12/24/2023   16:08:37   (  69.92, -66.02) 12/24/2023   16:08:50  (  69.92, -65.94)    2.92                13
 12/24/2023   16:59:18   ( -69.78, 101.51) 12/24/2023   16:58:20  ( -69.81, 101.53)    3.38                58
 12/27/2023   07:34:47   ( -69.99,-117.66) 12/27/2023   07:35:52  ( -69.99,-117.60)    2.19                65
 12/27/2023   08:25:31   (  69.87,  49.82) 12/27/2023   08:25:19  (  69.89,  49.89)    3.16                12
 12/27/2023   09:16:06   ( -69.41,-142.19) 12/27/2023   09:14:54  ( -69.50,-143.00)   33.42                72
 12/29/2023   23:51:40   ( -69.95,  -1.83) 12/29/2023   23:52:20  ( -69.92,  -1.82)    2.93                40
 12/30/2023   00:42:24   (  69.83, 165.65) 12/30/2023   00:41:47  (  69.81, 165.67)    2.55                37
 01/01/2024   15:18:01   (  70.49, -54.21) 01/01/2024   15:19:11  (  70.36, -52.94)   49.56                70
 01/01/2024   16:08:33   ( -69.87, 114.07) 01/01/2024   16:08:48  ( -69.87, 113.99)    2.87                15
 01/01/2024   16:59:17   (  69.76, -78.46) 01/01/2024   16:58:15  (  69.75, -78.52)    2.43                62
 01/04/2024   07:34:45   (  69.95,  62.41) 01/04/2024   07:35:45  (  69.93,  62.34)    3.56                60
 01/04/2024   08:25:27   ( -69.86,-130.14) 01/04/2024   08:25:14  ( -69.88,-130.10)    2.90                13
 01/04/2024   09:16:00   (  69.16,  38.18) 01/04/2024   09:14:51  (  69.21,  36.65)   60.91                69
 01/06/2024   23:51:38   (  69.90, 178.26) 01/06/2024   23:52:11  (  69.90, 178.19)    2.83                33
 01/07/2024   00:42:20   ( -69.80, -14.28) 01/07/2024   00:41:41  ( -69.80, -14.32)    1.79                39