Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 8 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)
 08/20/2025   22:12:03   (  70.10,-156.71) 08/20/2025   22:13:10  (  70.11,-156.79)    3.13                67
 08/20/2025   23:02:46   ( -70.04,  10.71) 08/20/2025   23:02:39  ( -70.05,  10.76)    2.34                 7
 08/20/2025   23:53:23   (  69.58, 178.70) 08/20/2025   23:52:12  (  69.62, 177.81)   34.90                71
 08/23/2025   14:28:58   (  70.11, -40.95) 08/23/2025   14:29:40  (  70.08, -40.94)    3.07                42
 08/23/2025   15:19:40   ( -69.99, 126.54) 08/23/2025   15:19:10  ( -69.97, 126.53)    2.53                30
 08/26/2025   05:55:23   ( -70.94, -93.82) 08/26/2025   05:56:30  ( -70.86, -91.56)   83.07                67
 08/26/2025   06:45:52   (  70.07,  74.88) 08/26/2025   06:46:10  (  70.04,  74.88)    3.36                18
 08/26/2025   07:36:34   ( -69.95,-117.62) 08/26/2025   07:35:40  ( -69.93,-117.64)    2.43                54
 08/28/2025   22:12:02   ( -70.12,  23.26) 08/28/2025   22:13:12  ( -70.15,  23.27)    2.72                70
 08/28/2025   23:02:46   (  70.04,-169.30) 08/28/2025   23:02:39  (  70.04,-169.23)    2.33                 7
 08/28/2025   23:53:24   ( -69.71,  -1.48) 08/28/2025   23:52:12  ( -69.77,  -1.98)   20.35                72
 08/31/2025   14:28:55   ( -70.09, 139.09) 08/31/2025   14:29:41  ( -70.08, 139.06)    2.04                46
 08/31/2025   15:19:38   (  69.95, -53.39) 08/31/2025   15:19:08  (  69.97, -53.45)    2.59                30
 09/03/2025   05:55:21   (  70.92,  86.22) 09/03/2025   05:56:28  (  70.80,  88.39)   80.14                67
 09/03/2025   06:45:49   ( -70.07,-105.10) 09/03/2025   06:46:10  ( -70.04,-105.10)    2.38                21
 09/03/2025   07:36:32   (  69.93,  62.42) 09/03/2025   07:35:37  (  69.93,  62.38)    1.45                55