Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 20.  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)
 05/20/2023   22:23:03   (   0.02,-137.00) (   0.58,-134.52)  281.87                80
 05/22/2023   10:42:10   (  -0.02,-136.99) (   0.64,-139.79)  319.40                80
 05/23/2023   10:26:06   (  -0.01,-136.98) (  -0.37,-135.26)  196.24                80
 05/24/2023   22:45:23   (   0.01,-136.97) (  -0.78,-140.57)  410.46                80
 05/25/2023   22:29:19   (   0.00,-136.96) (   0.23,-136.04)  104.94                80
 05/27/2023   10:48:26   (  -0.00,-136.95) (   0.98,-141.31)  497.07                80
 05/28/2023   10:32:22   (   0.00,-136.94) (  -0.03,-136.78)   18.06                80
 05/30/2023   22:32:53   (  -0.00,-136.90) (  -0.15,-137.55)   74.67                80
 05/31/2023   22:16:49   (  -0.00,-136.88) (   0.87,-133.03)  439.87                80
 06/02/2023   10:35:56   (  -0.01,-136.86) (   0.34,-138.29)  163.81                80