Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 27.  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)
 05/27/2023   10:48:26   (   0.00,-137.00) (   0.96,-141.31)  491.07                80
 05/28/2023   10:32:22   (   0.01,-137.00) (  -0.05,-136.78)   25.07                80
 05/30/2023   22:32:54   (  -0.01,-136.98) (  -0.14,-137.56)   65.65                80
 05/31/2023   22:16:49   (  -0.01,-136.97) (   0.88,-133.03)  449.78                80
 06/02/2023   10:35:57   (  -0.01,-136.97) (   0.32,-138.29)  152.07                80
 06/03/2023   10:19:52   (  -0.01,-136.95) (  -0.70,-133.77)  362.75                80
 06/04/2023   22:39:08   (   0.01,-136.92) (  -0.50,-139.07)  245.82                80
 06/05/2023   22:23:04   (   0.01,-136.90) (   0.53,-134.54)  268.49                80
 06/07/2023   10:42:11   (  -0.01,-136.88) (   0.67,-139.81)  334.89                80
 06/08/2023   10:26:07   (   0.00,-136.85) (  -0.36,-135.28)  179.15                80
 06/09/2023   22:45:23   (   0.00,-136.81) (  -0.83,-140.59)  430.31                80