Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 9 15.  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)
 09/16/2023   23:50:56   (  70.03, 178.30) 09/16/2023   23:52:04  (  70.00, 178.33)    2.97                68
 09/17/2023   00:41:37   ( -69.90, -14.19) 09/17/2023   00:41:34  ( -69.89, -14.19)    0.65                 3
 09/17/2023   01:32:17   (  69.55, 153.62) 09/17/2023   01:31:05  (  69.57, 153.01)   23.97                72
 09/19/2023   16:07:49   (  69.95, -65.82) 09/19/2023   16:08:33  (  69.93, -65.88)    3.43                44
 09/19/2023   16:58:31   ( -69.87, 101.62) 09/19/2023   16:58:02  ( -69.88, 101.67)    2.20                29
 09/22/2023   07:34:15   ( -70.85,-118.78) 09/22/2023   07:35:22  ( -70.70,-116.52)   84.28                67
 09/22/2023   08:24:44   (  69.94,  49.96) 09/22/2023   08:25:01  (  69.93,  50.00)    1.95                17
 09/22/2023   09:15:25   ( -69.80,-142.51) 09/22/2023   09:14:31  ( -69.82,-142.51)    2.33                54
 09/24/2023   23:50:54   ( -70.01,  -1.67) 09/24/2023   23:52:02  ( -70.01,  -1.64)    1.38                68
 09/25/2023   00:41:38   (  69.89, 165.81) 09/25/2023   00:41:29  (  69.89, 165.85)    1.49                 9
 09/25/2023   01:32:15   ( -69.54, -26.35) 09/25/2023   01:31:03  ( -69.57, -26.97)   24.19                72
 09/27/2023   16:07:48   ( -69.96, 114.17) 09/27/2023   16:08:30  ( -69.94, 114.16)    2.05                42
 09/27/2023   16:58:32   (  69.85, -78.35) 09/27/2023   16:57:57  (  69.82, -78.36)    2.54                35