Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 12.  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)
 07/12/2023   22:29:04   (  -0.00,-137.01) (   0.22,-136.04)  110.30                80
 07/14/2023   10:50:50   (   0.01,-137.00) (   0.97,-141.30)  490.43                80
 07/15/2023   10:29:24   (   0.01,-137.00) (  -0.03,-136.77)   25.78                80
 07/17/2023   22:32:34   (  -0.02,-136.98) (  -0.13,-137.54)   63.13                80
 07/18/2023   22:16:29   (  -0.02,-136.97) (   0.88,-133.00)  452.78                80
 07/20/2023   10:38:15   (   0.03,-136.96) (   0.31,-138.27)  148.95                80
 07/21/2023   10:16:50   (   0.03,-136.95) (  -0.70,-133.73)  366.68                80
 07/22/2023   22:38:44   (  -0.03,-136.93) (  -0.52,-139.03)  238.97                80
 07/23/2023   22:22:38   (  -0.03,-136.92) (   0.50,-134.49)  276.46                80
 07/25/2023   10:44:25   (   0.04,-136.90) (   0.69,-139.76)  326.09                80
 07/26/2023   10:22:59   (   0.04,-136.88) (  -0.33,-135.22)  188.80                80