Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 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)
 05/30/2023   22:32:54   (   0.01,-137.00) (  -0.12,-137.56)   63.79                80
 05/31/2023   22:16:50   (   0.01,-137.00) (   0.90,-133.03)  452.58                80
 06/02/2023   10:35:57   (  -0.02,-137.01) (   0.30,-138.30)  147.36                80
 06/03/2023   10:19:52   (  -0.02,-137.01) (  -0.73,-133.77)  368.51                80
 06/04/2023   22:39:09   (   0.02,-136.99) (  -0.47,-139.08)  238.73                80
 06/05/2023   22:23:04   (   0.01,-136.98) (   0.55,-134.55)  276.61                80
 06/07/2023   10:42:12   (  -0.01,-136.97) (   0.64,-139.82)  324.87                80
 06/08/2023   10:26:07   (  -0.00,-136.95) (  -0.38,-135.29)  190.16                80
 06/09/2023   22:45:23   (   0.00,-136.92) (  -0.81,-140.59)  418.07                80
 06/10/2023   22:29:18   (  -0.00,-136.91) (   0.16,-136.05)   96.91                80