Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 10.  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)
 06/10/2023   22:29:19   (  -0.00,-136.99) (   0.21,-136.06)  106.59                80
 06/12/2023   10:48:26   (   0.00,-137.00) (   0.97,-141.33)  493.50                80
 06/13/2023   10:32:21   (   0.00,-137.00) (  -0.07,-136.80)   22.67                80
 06/15/2023   22:32:52   (   0.01,-136.97) (  -0.14,-137.57)   68.55                80
 06/16/2023   22:16:48   (   0.01,-136.97) (   0.90,-133.05)  446.93                80
 06/18/2023   10:35:55   (  -0.01,-136.96) (   0.27,-138.32)  154.62                80
 06/19/2023   10:19:50   (  -0.01,-136.94) (  -0.71,-133.78)  360.56                80
 06/20/2023   22:39:06   (   0.01,-136.92) (  -0.46,-139.09)  247.19                80
 06/21/2023   22:23:00   (   0.00,-136.90) (   0.52,-134.55)  267.88                80
 06/23/2023   10:42:08   (  -0.00,-136.89) (   0.65,-139.82)  334.25                80