Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 17.  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)
 05/18/2023   10:19:50   (   0.00,-137.00) (  -0.71,-133.73)  372.32                80
 05/19/2023   22:39:07   (  -0.00,-137.00) (  -0.46,-139.05)  233.60                80
 05/20/2023   22:23:03   (  -0.00,-136.99) (   0.55,-134.52)  282.12                80
 05/22/2023   10:44:51   (  -0.01,-136.99) (   0.61,-139.79)  319.23                80
 05/23/2023   10:23:26   (  -0.01,-136.98) (  -0.40,-135.26)  196.08                80
 05/24/2023   22:45:23   (   0.02,-136.97) (  -0.82,-140.57)  411.00                80
 05/25/2023   22:29:19   (   0.02,-136.96) (   0.25,-136.05)  104.24                80
 05/27/2023   10:48:27   (  -0.02,-136.95) (   0.96,-141.31)  497.73                80
 05/28/2023   10:32:22   (  -0.02,-136.94) (  -0.05,-136.78)   17.28                80
 05/30/2023   22:32:54   (   0.02,-136.90) (  -0.14,-137.56)   75.71                80