Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 13.  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,  67.48) 12/15/2023   07:10:46  (  70.64,  69.53)   76.10                67
 12/15/2023   08:00:07   ( -69.91,-123.89) 12/15/2023   08:00:27  ( -69.93,-123.87)    2.31                20
 12/15/2023   08:50:51   (  69.80,  43.58) 12/15/2023   08:49:55  (  69.77,  43.55)    3.39                56
 12/17/2023   23:26:21   (  70.02,-175.60) 12/17/2023   23:27:28  (  70.00,-175.53)    3.42                67
 12/18/2023   00:17:02   ( -69.87,  -8.06) 12/18/2023   00:16:58  ( -69.90,  -8.04)    2.96                 4
 12/18/2023   01:07:41   (  69.49, 159.80) 12/18/2023   01:06:29  (  69.57, 159.15)   26.65                72
 12/20/2023   15:43:15   (  69.93, -59.70) 12/20/2023   15:43:59  (  69.94, -59.74)    1.63                44
 12/20/2023   16:33:57   ( -69.84, 107.76) 12/20/2023   16:33:29  ( -69.84, 107.75)    0.52                28
 12/23/2023   07:09:42   ( -70.85,-112.70) 12/23/2023   07:10:49  ( -70.74,-110.34)   87.10                67
 12/23/2023   08:00:10   (  69.91,  56.11) 12/23/2023   08:00:29  (  69.92,  56.10)    1.01                19
 12/23/2023   08:50:52   ( -69.81,-136.43) 12/23/2023   08:49:59  ( -69.82,-136.40)    1.37                53
 12/25/2023   23:26:20   ( -69.99,   4.44) 12/25/2023   23:27:31  ( -69.99,   4.43)    0.70                71
 12/26/2023   00:17:04   (  69.89, 171.91) 12/26/2023   00:16:58  (  69.87, 171.92)    2.09                 6
 12/26/2023   01:07:43   ( -69.63, -20.39) 12/26/2023   01:06:30  ( -69.66, -20.74)   13.91                73