Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 6.  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)
 12/07/2023   07:09:34   ( -70.64,-112.34) 12/07/2023   07:10:42  ( -70.56,-110.56)   66.41                68
 12/07/2023   08:00:06   (  69.90,  56.12) 12/07/2023   08:00:19  (  69.91,  56.14)    1.22                13
 12/07/2023   08:50:48   ( -69.81,-136.42) 12/07/2023   08:49:49  ( -69.79,-136.39)    1.97                59
 12/09/2023   23:26:17   ( -69.95,   4.51) 12/09/2023   23:27:18  ( -69.96,   4.46)    1.79                61
 12/10/2023   00:17:01   (  69.84, 171.98) 12/10/2023   00:16:45  (  69.85, 171.96)    1.27                16
 12/10/2023   01:07:33   ( -69.22, -19.80) 12/10/2023   01:06:23  ( -69.30, -21.16)   54.48                70
 12/12/2023   15:43:13   ( -69.95, 120.27) 12/12/2023   15:43:43  ( -69.93, 120.32)    3.28                30
 12/12/2023   16:33:56   (  69.79, -72.18) 12/12/2023   16:33:10  (  69.82, -72.19)    2.85                46
 12/15/2023   07:09:25   (  70.01,  68.64) 12/15/2023   07:10:37  (  69.98,  68.66)    3.30                72
 12/15/2023   08:00:06   ( -69.86,-123.81) 12/15/2023   08:00:07  ( -69.87,-123.86)    2.51                 1
 12/15/2023   08:50:48   (  69.65,  43.81) 12/15/2023   08:49:35  (  69.70,  43.55)   11.99                73
 12/17/2023   23:26:19   (  69.92,-175.46) 12/17/2023   23:27:01  (  69.95,-175.48)    3.15                42
 12/18/2023   00:17:01   ( -69.82,  -7.99) 12/18/2023   00:16:31  ( -69.85,  -7.99)    2.58                30
 12/20/2023   14:52:41   ( -70.58, 131.98) 12/20/2023   14:53:50  ( -70.45, 133.50)   57.96                69
 12/20/2023   15:43:14   (  69.90, -59.65) 12/20/2023   15:43:25  (  69.89, -59.66)    0.57                11
 12/20/2023   16:33:56   ( -69.80, 107.82) 12/20/2023   16:32:55  ( -69.79, 107.83)    0.71                61