Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 5 4.  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)
 05/06/2023   10:44:45   (   0.00,-137.00) (   0.59,-139.75)  312.68                80
 05/07/2023   10:23:20   (   0.00,-136.99) (  -0.39,-135.21)  202.54                80
 05/08/2023   22:45:18   (   0.00,-136.97) (  -0.79,-140.52)  404.65                80
 05/09/2023   22:29:13   (   0.00,-136.96) (   0.20,-135.99)  109.96                80
 05/11/2023   10:51:02   (  -0.01,-136.94) (   0.99,-141.26)  493.38                80
 05/12/2023   10:29:38   (  -0.01,-136.93) (  -0.07,-136.75)   21.04                80
 05/14/2023   22:32:51   (   0.00,-136.88) (  -0.11,-137.53)   72.83                80
 05/15/2023   22:16:47   (   0.01,-136.87) (   0.89,-133.00)  441.52                80
 05/17/2023   10:38:35   (  -0.01,-136.84) (   0.29,-138.27)  162.30                80
 05/18/2023   10:17:10   (  -0.01,-136.82) (  -0.71,-133.74)  351.51                80