Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 4.  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)
 12/04/2023   15:43:10   (  69.92, -59.67) 12/04/2023   15:43:53  (  69.94, -59.71)    2.75                43
 12/04/2023   16:33:52   ( -69.83, 107.79) 12/04/2023   16:33:23  ( -69.83, 107.76)    0.99                29
 12/07/2023   07:09:34   ( -70.65,-112.35) 12/07/2023   07:10:42  ( -70.56,-110.57)   66.82                68
 12/07/2023   08:00:06   (  69.91,  56.11) 12/07/2023   08:00:19  (  69.91,  56.14)    1.24                13
 12/07/2023   08:50:48   ( -69.81,-136.43) 12/07/2023   08:49:49  ( -69.79,-136.39)    2.91                59
 12/09/2023   23:26:17   ( -69.97,   4.48) 12/09/2023   23:27:17  ( -70.00,   4.52)    3.00                60
 12/10/2023   00:17:01   (  69.87, 171.95) 12/10/2023   00:16:44  (  69.89, 172.01)    3.10                17
 12/10/2023   01:07:33   ( -69.24, -19.82) 12/10/2023   01:06:23  ( -69.28, -21.18)   53.81                70
 12/12/2023   15:43:12   ( -69.94, 120.30) 12/12/2023   15:43:42  ( -69.94, 120.34)    1.54                30
 12/12/2023   16:33:56   (  69.84, -72.23) 12/12/2023   16:33:09  (  69.83, -72.17)    2.43                47
 12/15/2023   07:09:24   (  70.03,  68.62) 12/15/2023   07:10:35  (  70.01,  68.71)    3.49                71
 12/15/2023   08:00:05   ( -69.87,-123.82) 12/15/2023   08:00:06  ( -69.85,-123.89)    3.30                 1
 12/15/2023   08:50:47   (  69.66,  43.80) 12/15/2023   08:49:34  (  69.68,  43.52)   10.83                73
 12/17/2023   23:26:17   (  69.92,-175.44) 12/17/2023   23:26:59  (  69.93,-175.50)    2.66                42
 12/18/2023   00:16:59   ( -69.81,  -7.97) 12/18/2023   00:16:29  ( -69.83,  -8.01)    2.27                30