Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 9 15.  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)
 09/16/2023   10:50:27   (   0.01,-137.01) (   0.99,-141.28)  487.12                80
 09/17/2023   10:29:02   (   0.00,-137.01) (  -0.03,-136.75)   28.97                80
 09/19/2023   22:32:15   (  -0.00,-136.99) (  -0.10,-137.53)   61.70                80
 09/20/2023   22:16:10   (  -0.00,-136.98) (   0.92,-133.00)  453.51                80
 09/22/2023   10:37:58   (   0.00,-136.96) (   0.28,-138.27)  149.16                80
 09/23/2023   10:16:33   (   0.00,-136.94) (  -0.74,-133.74)  365.39                80
 09/24/2023   22:38:29   (  -0.01,-136.91) (  -0.51,-139.03)  242.58                80
 09/25/2023   22:22:24   (  -0.01,-136.89) (   0.52,-134.51)  271.75                80
 09/27/2023   10:44:11   (   0.01,-136.87) (   0.67,-139.77)  331.74                80
 09/28/2023   10:22:47   (   0.01,-136.85) (  -0.36,-135.25)  182.39                80