Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 9 16.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2025   22:37:13   ( -70.08,  17.02) 09/17/2025   22:38:01  ( -70.07,  16.95)    3.19                48
 09/17/2025   23:27:57   (  69.96,-175.49) 09/17/2025   23:27:28  (  69.97,-175.55)    2.40                29
 09/20/2025   14:03:41   (  71.03, -36.04) 09/20/2025   14:04:47  (  70.97, -33.47)   93.50                66
 09/20/2025   14:54:06   ( -70.06, 132.84) 09/20/2025   14:54:32  ( -70.04, 132.78)    3.34                26
 09/20/2025   15:44:50   (  69.94, -59.67) 09/20/2025   15:43:59  (  69.93, -59.72)    2.16                51
 09/23/2025   06:20:20   (  70.27,  80.97) 09/23/2025   06:21:31  (  70.20,  81.26)   13.82                71
 09/23/2025   07:10:59   ( -70.04,-111.35) 09/23/2025   07:11:02  ( -70.04,-111.34)    0.56                 3
 09/23/2025   08:01:42   (  69.86,  56.23) 09/23/2025   08:00:30  (  69.88,  56.08)    5.86                72
 09/25/2025   22:37:10   (  70.10,-162.98) 09/25/2025   22:38:02  (  70.13,-162.96)    3.40                52
 09/25/2025   23:27:52   ( -70.02,   4.46) 09/25/2025   23:27:32  ( -70.02,   4.52)    2.56                20
 09/26/2025   00:18:20   (  69.04, 173.18) 09/26/2025   00:17:13  (  69.14, 170.97)   88.29                67
 09/28/2025   14:54:02   (  70.09, -47.18) 09/28/2025   14:54:31  (  70.09, -47.13)    2.13                29
 09/28/2025   15:44:43   ( -69.96, 120.33) 09/28/2025   15:44:02  ( -69.94, 120.28)    2.90                41