Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 12.  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)
 12/12/2023   15:43:13   ( -69.96, 120.26) 12/12/2023   15:43:57  ( -69.94, 120.27)    2.79                44
 12/12/2023   16:33:57   (  69.85, -72.26) 12/12/2023   16:33:24  (  69.84, -72.23)    1.93                33
 12/15/2023   07:09:40   (  70.75,  67.48) 12/15/2023   07:10:47  (  70.64,  69.53)   76.38                67
 12/15/2023   08:00:07   ( -69.91,-123.90) 12/15/2023   08:00:27  ( -69.93,-123.87)    2.47                20
 12/15/2023   08:50:51   (  69.80,  43.58) 12/15/2023   08:49:54  (  69.83,  43.63)    3.40                57
 12/17/2023   23:26:20   (  69.97,-175.52) 12/17/2023   23:27:29  (  69.96,-175.59)    2.71                69
 12/18/2023   00:17:02   ( -69.87,  -8.06) 12/18/2023   00:16:59  ( -69.86,  -8.10)    2.20                 3
 12/18/2023   01:07:41   (  69.49, 159.80) 12/18/2023   01:06:29  (  69.58, 159.16)   26.57                72
 12/20/2023   15:43:16   (  69.98, -59.78) 12/20/2023   15:43:59  (  69.97, -59.70)    3.06                43
 12/20/2023   16:33:57   ( -69.83, 107.77) 12/20/2023   16:33:30  ( -69.82, 107.72)    2.61                27
 12/23/2023   07:09:43   ( -70.89,-112.76) 12/23/2023   07:10:49  ( -70.79,-110.27)   91.71                66
 12/23/2023   08:00:10   (  69.90,  56.13) 12/23/2023   08:00:30  (  69.91,  56.09)    2.13                20
 12/23/2023   08:50:52   ( -69.80,-136.41) 12/23/2023   08:50:00  ( -69.81,-136.41)    1.88                52
 12/25/2023   23:26:22   ( -70.02,   4.39) 12/25/2023   23:27:33  ( -70.01,   4.46)    3.20                71
 12/26/2023   00:17:04   (  69.87, 171.94) 12/26/2023   00:16:59  (  69.89, 171.93)    2.23                 5
 12/26/2023   01:07:44   ( -69.66, -20.44) 12/26/2023   01:06:31  ( -69.68, -20.72)   11.01                73