Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2025 8 18.  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)
 08/18/2025   05:55:22   (  70.78,  86.44) 08/18/2025   05:56:30  (  70.72,  88.23)   65.97                68
 08/18/2025   06:45:52   ( -70.03,-105.06) 08/18/2025   06:46:10  ( -70.05,-105.11)    3.29                18
 08/18/2025   07:36:36   (  69.94,  62.39) 08/18/2025   07:35:37  (  69.95,  62.39)    1.37                59
 08/20/2025   22:12:03   (  70.10,-156.71) 08/20/2025   22:13:10  (  70.11,-156.79)    2.95                67
 08/20/2025   23:02:46   ( -70.04,  10.71) 08/20/2025   23:02:39  ( -70.05,  10.76)    2.50                 7
 08/20/2025   23:53:23   (  69.58, 178.70) 08/20/2025   23:52:12  (  69.62, 177.81)   34.76                71
 08/23/2025   14:28:57   (  70.06, -40.88) 08/23/2025   14:29:40  (  70.08, -40.94)    3.27                43
 08/23/2025   15:19:40   ( -69.99, 126.54) 08/23/2025   15:19:10  ( -69.97, 126.54)    2.40                30
 08/26/2025   05:55:23   ( -70.94, -93.83) 08/26/2025   05:56:30  ( -70.86, -91.56)   83.28                67
 08/26/2025   06:45:51   (  70.03,  74.95) 08/26/2025   06:46:10  (  70.04,  74.88)    3.11                19
 08/26/2025   07:36:34   ( -69.96,-117.63) 08/26/2025   07:35:40  ( -69.93,-117.64)    2.46                54
 08/28/2025   22:12:02   ( -70.13,  23.26) 08/28/2025   22:13:12  ( -70.15,  23.27)    2.46                70
 08/28/2025   23:02:46   (  70.05,-169.31) 08/28/2025   23:02:39  (  70.04,-169.24)    2.79                 7
 08/28/2025   23:53:24   ( -69.71,  -1.49) 08/28/2025   23:52:12  ( -69.77,  -1.98)   19.95                72
 08/31/2025   14:28:55   ( -70.10, 139.08) 08/31/2025   14:29:41  ( -70.08, 139.06)    2.47                46
 08/31/2025   15:19:38   (  69.96, -53.41) 08/31/2025   15:19:08  (  69.96, -53.46)    1.73                30