Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 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)
 09/15/2023   15:42:33   (  70.29, -59.99) 09/15/2023   15:43:44  (  70.21, -59.30)   27.36                71
 09/15/2023   16:33:09   ( -69.90, 107.93) 09/15/2023   16:33:18  ( -69.88, 107.87)    2.88                 9
 09/15/2023   17:23:53   (  69.77, -84.57) 09/15/2023   17:22:45  (  69.78, -84.63)    2.92                68
 09/18/2023   07:59:23   (  70.00,  56.23) 09/18/2023   08:00:18  (  69.97,  56.23)    3.25                55
 09/18/2023   08:50:04   ( -69.86,-136.25) 09/18/2023   08:49:48  ( -69.86,-136.29)    1.32                16
 09/18/2023   09:40:35   (  69.05,  32.23) 09/18/2023   09:39:27  (  69.09,  30.32)   75.80                68
 09/21/2023   00:16:16   (  69.93, 172.10) 09/21/2023   00:16:47  (  69.91, 172.03)    3.44                31
 09/21/2023   01:06:58   ( -69.84, -20.45) 09/21/2023   01:06:16  ( -69.86, -20.41)    2.44                42
 09/23/2023   15:42:33   ( -70.35, 119.91) 09/23/2023   15:43:44  ( -70.25, 120.76)   33.60                71
 09/23/2023   16:33:11   (  69.92, -72.12) 09/23/2023   16:33:15  (  69.92, -72.06)    2.03                 4
 09/23/2023   17:23:52   ( -69.78,  95.41) 09/23/2023   17:22:46  ( -69.76,  95.35)    2.84                66
 09/26/2023   07:59:21   ( -69.98,-123.75) 09/26/2023   08:00:17  ( -69.96,-123.77)    1.88                56
 09/26/2023   08:50:05   (  69.86,  43.73) 09/26/2023   08:49:44  (  69.85,  43.72)    2.03                21