Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 24.  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)
 05/24/2023   22:45:23   (   0.01,-137.00) (  -0.80,-140.57)  407.39                80
 05/25/2023   22:29:18   (  -0.00,-137.00) (   0.21,-136.04)  109.27                80
 05/27/2023   10:48:26   (   0.01,-137.01) (   1.00,-141.30)  490.39                80
 05/28/2023   10:32:21   (   0.01,-137.01) (  -0.02,-136.78)   26.03                80
 05/30/2023   22:32:53   (  -0.01,-136.99) (  -0.17,-137.55)   64.27                80
 05/31/2023   22:16:49   (  -0.01,-136.99) (   0.85,-133.02)  451.48                80
 06/02/2023   10:35:57   (   0.00,-136.98) (   0.29,-138.30)  150.01                80
 06/03/2023   10:19:53   (  -0.00,-136.97) (  -0.74,-133.77)  365.01                80
 06/04/2023   22:39:09   (   0.01,-136.94) (  -0.45,-139.08)  243.22                80
 06/05/2023   22:23:03   (   0.00,-136.92) (   0.51,-134.54)  271.31                80
 06/07/2023   10:42:11   (  -0.00,-136.90) (   0.68,-139.81)  331.80                80