Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 10 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/18/2019   22:22:09   (   0.00,-137.20) (   0.79,-133.75)  393.82                80
 10/20/2019   10:46:19   (   0.00,-137.19) (   0.42,-138.94)  200.08                80
 10/21/2019   10:24:45   (  -0.00,-137.19) (  -0.64,-134.38)  320.24                80
 10/22/2019   22:49:05   (   0.00,-137.17) (  -0.54,-139.62)  278.47                80
 10/23/2019   22:27:30   (   0.01,-137.16) (   0.47,-135.04)  241.61                80
 10/25/2019   10:51:41   (  -0.00,-137.15) (   0.68,-140.25)  353.16                80
 10/26/2019   10:30:06   (   0.00,-137.13) (  -0.32,-135.67)  166.76                80
 10/27/2019   22:51:46   (  -0.02,-137.11) (  -0.85,-140.91)  432.44                80
 10/28/2019   22:35:30   (  -0.02,-137.10) (   0.16,-136.33)   87.22                80
 10/31/2019   10:35:26   (   0.02,-137.05) (  -0.01,-136.96)   10.55                80