Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 06/15/2023   22:32:53   (   0.02,-137.01) (  -0.11,-137.58)   65.24                80
 06/16/2023   22:16:48   (   0.02,-137.00) (   0.92,-133.05)  451.01                80
 06/18/2023   10:35:55   (  -0.02,-137.01) (   0.25,-138.32)  149.19                80
 06/19/2023   10:19:50   (  -0.01,-137.00) (  -0.73,-133.78)  366.84                80
 06/20/2023   22:39:06   (   0.00,-136.98) (  -0.44,-139.09)  239.60                80
 06/21/2023   22:23:01   (  -0.00,-136.98) (   0.54,-134.55)  276.26                80
 06/23/2023   10:42:08   (   0.00,-136.97) (   0.63,-139.82)  324.60                80
 06/24/2023   10:26:03   (   0.01,-136.96) (  -0.36,-135.29)  191.02                80
 06/25/2023   22:45:19   (  -0.01,-136.94) (  -0.80,-140.60)  416.13                80
 06/26/2023   22:29:13   (  -0.01,-136.93) (   0.18,-136.06)   99.16                80