Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 9 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)
 09/21/2025   22:12:01   (  70.69,-157.58) 09/21/2025   22:13:10  (  70.59,-156.09)   55.85                69
 09/21/2025   23:02:32   ( -70.03,  10.77) 09/21/2025   23:02:48  ( -70.03,  10.73)    1.47                16
 09/21/2025   23:53:17   (  69.96, 178.19) 09/21/2025   23:52:15  (  69.94, 178.24)    2.92                62
 09/24/2025   14:28:44   (  70.14, -40.94) 09/24/2025   14:29:49  (  70.12, -40.90)    2.98                65
 09/24/2025   15:19:25   ( -70.02, 126.57) 09/24/2025   15:19:19  ( -70.01, 126.57)    0.79                 6
 09/24/2025   16:10:03   (  69.57, -65.45) 09/24/2025   16:08:51  (  69.63, -66.31)   33.75                72
 09/27/2025   06:45:36   (  70.08,  74.94) 09/27/2025   06:46:20  (  70.06,  74.90)    2.27                44
 09/27/2025   07:36:17   ( -69.95,-117.55) 09/27/2025   07:35:50  ( -69.96,-117.62)    2.64                27
 09/29/2025   22:12:01   ( -71.09,  21.77) 09/29/2025   22:13:07  ( -70.97,  24.48)   98.77                66
 09/29/2025   23:02:27   (  70.02,-169.20) 09/29/2025   23:02:49  (  70.04,-169.26)    2.89                22
 09/29/2025   23:53:09   ( -69.95,  -1.77) 09/29/2025   23:52:19  ( -69.93,  -1.77)    1.83                50
 10/02/2025   14:28:38   ( -70.26, 138.91) 10/02/2025   14:29:50  ( -70.21, 139.22)   13.01                72
 10/02/2025   15:19:20   (  70.03, -53.42) 10/02/2025   15:19:18  (  70.04, -53.37)    2.66                 2
 10/02/2025   16:10:01   ( -69.90, 114.09) 10/02/2025   16:08:49  ( -69.89, 114.04)    2.46                72