Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 20.  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)
 12/21/2023   23:51:42   (  69.92, 178.20) 12/21/2023   23:52:21  (  69.90, 178.15)    2.84                39
 12/22/2023   00:42:24   ( -69.83, -14.35) 12/22/2023   00:41:50  ( -69.84, -14.29)    2.50                34
 12/24/2023   15:18:05   ( -70.65, 125.52) 12/24/2023   15:19:13  ( -70.54, 127.32)   67.56                68
 12/24/2023   16:08:37   (  69.91, -66.01) 12/24/2023   16:08:50  (  69.89, -65.98)    2.43                13
 12/24/2023   16:59:18   ( -69.77, 101.52) 12/24/2023   16:58:20  ( -69.78, 101.50)    1.89                58
 12/27/2023   07:34:47   ( -69.97,-117.63) 12/27/2023   07:35:52  ( -69.96,-117.65)    1.05                65
 12/27/2023   08:25:31   (  69.86,  49.84) 12/27/2023   08:25:19  (  69.85,  49.85)    0.64                12
 12/27/2023   09:16:06   ( -69.39,-142.16) 12/27/2023   09:14:54  ( -69.47,-143.04)   35.39                72
 12/29/2023   23:51:40   ( -69.92,  -1.79) 12/29/2023   23:52:19  ( -69.95,  -1.78)    2.75                39
 12/30/2023   00:42:24   (  69.81, 165.68) 12/30/2023   00:41:46  (  69.84, 165.71)    2.72                38
 01/01/2024   15:18:01   (  70.46, -54.16) 01/01/2024   15:19:11  (  70.34, -52.96)   46.76                70
 01/01/2024   16:08:34   ( -69.89, 114.04) 01/01/2024   16:08:47  ( -69.91, 114.05)    1.91                13
 01/01/2024   16:59:18   (  69.78, -78.49) 01/01/2024   16:58:14  (  69.79, -78.46)    1.55                64