Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 30.  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)
 07/01/2023   22:32:46   (   0.02,-137.00) (  -0.13,-137.56)   65.35                80
 07/02/2023   22:16:41   (   0.02,-136.99) (   0.92,-133.04)  450.29                80
 07/04/2023   10:35:47   (  -0.02,-136.98) (   0.28,-138.30)  151.12                80
 07/05/2023   10:19:42   (  -0.01,-136.96) (  -0.72,-133.77)  364.18                80
 07/06/2023   22:38:57   (   0.00,-136.94) (  -0.48,-139.07)  243.03                80
 07/07/2023   22:22:52   (  -0.00,-136.92) (   0.52,-134.53)  272.28                80
 07/09/2023   10:41:58   (   0.01,-136.91) (   0.68,-139.79)  329.48                80
 07/10/2023   10:25:54   (   0.01,-136.89) (  -0.38,-135.27)  185.52                80
 07/11/2023   22:45:08   (  -0.00,-136.86) (  -0.86,-140.56)  422.70                80
 07/12/2023   22:29:03   (  -0.00,-136.84) (   0.21,-136.04)   91.87                80