Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 9.  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)
 12/09/2023   23:26:17   ( -69.98,   4.47) 12/09/2023   23:27:25  ( -69.97,   4.45)    1.02                68
 12/10/2023   00:17:01   (  69.86, 171.95) 12/10/2023   00:16:52  (  69.87, 171.95)    0.83                 9
 12/10/2023   01:07:38   ( -69.50, -20.20) 12/10/2023   01:06:26  ( -69.54, -20.87)   26.18                72
 12/12/2023   15:43:12   ( -69.92, 120.32) 12/12/2023   15:43:57  ( -69.93, 120.26)    2.65                45
 12/12/2023   16:33:56   (  69.81, -72.20) 12/12/2023   16:33:24  (  69.82, -72.25)    2.03                32
 12/15/2023   07:09:39   (  70.71,  67.53) 12/15/2023   07:10:47  (  70.62,  69.50)   73.13                68
 12/15/2023   08:00:08   ( -69.93,-123.92) 12/15/2023   08:00:28  ( -69.92,-123.89)    1.84                20
 12/15/2023   08:50:52   (  69.82,  43.55) 12/15/2023   08:49:55  (  69.81,  43.60)    2.57                57
 12/17/2023   23:26:20   (  69.99,-175.56) 12/17/2023   23:27:28  (  69.98,-175.55)    0.93                68
 12/18/2023   00:17:02   ( -69.89,  -8.09) 12/18/2023   00:16:58  ( -69.88,  -8.06)    1.45                 4
 12/18/2023   01:07:41   (  69.52, 159.77) 12/18/2023   01:06:29  (  69.55, 159.13)   25.14                72
 12/20/2023   15:43:15   (  69.96, -59.74) 12/20/2023   15:43:58  (  69.98, -59.68)    3.27                43
 12/20/2023   16:33:56   ( -69.81, 107.80) 12/20/2023   16:33:29  ( -69.83, 107.74)    3.44                27