Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 14.  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)
 12/15/2023   07:09:39   (  70.74,  67.50) 12/15/2023   07:10:46  (  70.65,  69.55)   75.95                67
 12/15/2023   08:00:07   ( -69.91,-123.88) 12/15/2023   08:00:28  ( -69.89,-123.93)    2.81                21
 12/15/2023   08:50:51   (  69.79,  43.60) 12/15/2023   08:49:55  (  69.78,  43.57)    1.46                56
 12/17/2023   23:26:20   (  69.96,-175.51) 12/17/2023   23:27:29  (  69.97,-175.58)    2.84                69
 12/18/2023   00:17:02   ( -69.86,  -8.05) 12/18/2023   00:16:59  ( -69.86,  -8.10)    1.85                 3
 12/18/2023   01:07:41   (  69.49, 159.81) 12/18/2023   01:06:29  (  69.59, 159.17)   27.27                72
 12/20/2023   15:43:16   (  69.98, -59.77) 12/20/2023   15:43:59  (  69.97, -59.70)    2.80                43
 12/20/2023   16:33:57   ( -69.83, 107.77) 12/20/2023   16:33:30  ( -69.81, 107.71)    2.90                27
 12/23/2023   07:09:43   ( -70.90,-112.77) 12/23/2023   07:10:49  ( -70.78,-110.28)   91.74                66
 12/23/2023   08:00:10   (  69.90,  56.12) 12/23/2023   08:00:30  (  69.90,  56.08)    1.59                20
 12/23/2023   08:50:52   ( -69.80,-136.42) 12/23/2023   08:50:00  ( -69.80,-136.43)    0.39                52
 12/25/2023   23:26:20   ( -69.99,   4.45) 12/25/2023   23:27:32  ( -69.99,   4.43)    0.85                72
 12/26/2023   00:17:04   (  69.88, 171.92) 12/26/2023   00:16:59  (  69.87, 171.91)    1.12                 5
 12/26/2023   01:07:43   ( -69.62, -20.38) 12/26/2023   01:06:31  ( -69.66, -20.74)   14.70                72