Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 7 16.  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)
 07/17/2023   22:32:34   (  -0.01,-136.98) (  -0.14,-137.54)   63.29                80
 07/18/2023   22:16:29   (  -0.01,-136.97) (   0.88,-133.00)  452.48                80
 07/20/2023   10:38:15   (   0.01,-136.96) (   0.31,-138.27)  149.66                80
 07/21/2023   10:16:49   (   0.01,-136.94) (  -0.70,-133.73)  365.88                80
 07/22/2023   22:38:45   (  -0.01,-136.93) (  -0.46,-139.04)  239.75                80
 07/23/2023   22:22:39   (  -0.01,-136.92) (   0.56,-134.51)  275.60                80
 07/25/2023   10:44:25   (   0.01,-136.89) (   0.63,-139.77)  327.35                80
 07/26/2023   10:25:39   (   0.01,-136.87) (  -0.34,-135.22)  187.52                80
 07/27/2023   22:44:54   (  -0.01,-136.85) (  -0.82,-140.53)  419.54                80
 07/28/2023   22:28:48   (  -0.02,-136.82) (   0.15,-135.99)   94.73                80