Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 11.  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   15:43:12   ( -69.92, 120.33) 12/12/2023   15:43:57  ( -69.93, 120.26)    2.93                45
 12/12/2023   16:33:56   (  69.81, -72.20) 12/12/2023   16:33:24  (  69.83, -72.24)    2.98                32
 12/15/2023   07:09:40   (  70.76,  67.46) 12/15/2023   07:10:47  (  70.64,  69.52)   76.87                67
 12/15/2023   08:00:08   ( -69.92,-123.91) 12/15/2023   08:00:28  ( -69.93,-123.87)    1.43                20
 12/15/2023   08:50:52   (  69.81,  43.56) 12/15/2023   08:49:55  (  69.82,  43.62)    2.26                57
 12/17/2023   23:26:20   (  69.98,-175.54) 12/17/2023   23:27:28  (  70.01,-175.52)    3.40                68
 12/18/2023   00:17:02   ( -69.88,  -8.08) 12/18/2023   00:16:58  ( -69.91,  -8.03)    3.31                 4
 12/18/2023   01:07:41   (  69.51, 159.78) 12/18/2023   01:06:29  (  69.57, 159.16)   25.56                72
 12/20/2023   15:43:15   (  69.94, -59.72) 12/20/2023   15:43:59  (  69.97, -59.71)    2.63                44
 12/20/2023   16:33:57   ( -69.84, 107.75) 12/20/2023   16:33:29  ( -69.87, 107.79)    3.01                28
 12/23/2023   07:09:43   ( -70.91,-112.79) 12/23/2023   07:10:49  ( -70.79,-110.27)   92.90                66
 12/23/2023   08:00:10   (  69.91,  56.10) 12/23/2023   08:00:30  (  69.91,  56.09)    0.77                20
 12/23/2023   08:50:52   ( -69.81,-136.43) 12/23/2023   08:50:00  ( -69.81,-136.41)    0.77                52