Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 2.  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)
 12/02/2023   01:07:39   (  69.63, 159.62) 12/02/2023   01:06:26  (  69.67, 159.30)   13.00                73
 12/04/2023   15:43:10   (  69.92, -59.67) 12/04/2023   15:43:53  (  69.93, -59.72)    2.10                43
 12/04/2023   16:33:52   ( -69.83, 107.79) 12/04/2023   16:33:23  ( -69.82, 107.76)    1.46                29
 12/07/2023   07:09:33   ( -70.60,-112.27) 12/07/2023   07:10:42  ( -70.53,-110.61)   62.05                69
 12/07/2023   08:00:06   (  69.92,  56.10) 12/07/2023   08:00:18  (  69.92,  56.16)    2.45                12
 12/07/2023   08:50:48   ( -69.82,-136.43) 12/07/2023   08:49:48  ( -69.81,-136.36)    2.90                60
 12/09/2023   23:26:17   ( -69.98,   4.47) 12/09/2023   23:27:16  ( -69.97,   4.49)    1.02                59
 12/10/2023   00:17:01   (  69.87, 171.94) 12/10/2023   00:16:43  (  69.86, 171.98)    2.22                18
 12/10/2023   01:07:32   ( -69.19, -19.76) 12/10/2023   01:06:22  ( -69.26, -21.21)   57.69                70
 12/12/2023   15:43:11   ( -69.90, 120.36) 12/12/2023   15:43:40  ( -69.92, 120.31)    2.61                29
 12/12/2023   16:33:55   (  69.80, -72.17) 12/12/2023   16:33:07  (  69.80, -72.20)    1.20                48
 12/15/2023   07:09:23   (  69.99,  68.68) 12/15/2023   07:10:32  (  69.96,  68.66)    3.38                69
 12/15/2023   08:00:05   ( -69.89,-123.85) 12/15/2023   08:00:02  ( -69.86,-123.86)    3.39                 3
 12/15/2023   08:50:44   (  69.52,  44.00) 12/15/2023   08:49:32  (  69.57,  43.39)   24.25                72