Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/27/2021   23:05:14   (  -0.04,-137.21) (  -0.94,-141.26)  462.02                80
 09/28/2021   22:48:56   (  -0.04,-137.20) (   0.07,-136.67)   60.79                80
 10/01/2021   10:48:45   (   0.03,-137.19) (   0.05,-137.25)    7.78                80
 10/03/2021   22:51:22   (  -0.02,-137.16) (  -0.16,-137.87)   81.07                80
 10/04/2021   22:35:04   (  -0.02,-137.15) (   0.85,-133.28)  440.98                80
 10/06/2021   10:53:50   (   0.01,-137.13) (   0.33,-138.44)  150.83                80
 10/07/2021   10:37:33   (   0.02,-137.11) (  -0.74,-133.86)  370.86                80
 10/08/2021   22:56:28   (  -0.02,-137.08) (  -0.45,-139.06)  225.92                80
 10/09/2021   22:40:10   (  -0.02,-137.06) (   0.57,-134.47)  295.16                80