Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 19.  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)
 06/19/2023   10:19:50   (  -0.01,-137.00) (  -0.76,-133.79)  366.25                80
 06/20/2023   22:39:06   (   0.00,-136.98) (  -0.47,-139.08)  239.94                80
 06/21/2023   22:23:00   (  -0.01,-136.97) (   0.51,-134.54)  275.81                80
 06/23/2023   10:42:07   (   0.01,-136.96) (   0.65,-139.82)  325.54                80
 06/24/2023   10:26:02   (   0.02,-136.95) (  -0.33,-135.28)  189.97                80
 06/25/2023   22:45:18   (  -0.02,-136.93) (  -0.83,-140.59)  417.02                80
 06/26/2023   22:29:13   (  -0.02,-136.91) (   0.16,-136.05)   98.12                80
 06/29/2023   10:32:15   (   0.02,-136.88) (   0.01,-136.79)   10.20                80
 07/01/2023   22:32:45   (  -0.00,-136.82) (  -0.17,-137.56)   84.92                80
 07/02/2023   22:16:40   (  -0.00,-136.79) (   0.83,-133.03)  428.70                80