Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/04/2019   22:30:58   (   0.02,-137.19) (   0.48,-135.15)  232.92                80
 07/06/2019   10:49:50   (  -0.02,-137.21) (   0.67,-140.36)  359.19                80
 07/07/2019   10:33:35   (  -0.01,-137.20) (  -0.32,-135.78)  161.47                80
 07/08/2019   22:52:35   (   0.02,-137.18) (  -0.87,-141.02)  438.84                80
 07/09/2019   22:36:21   (   0.01,-137.17) (   0.18,-136.46)   81.65                80
 07/12/2019   10:36:18   (  -0.02,-137.17) (  -0.01,-137.09)    9.27                80
 07/14/2019   22:39:03   (   0.02,-137.12) (  -0.12,-137.76)   73.01                80
 07/15/2019   22:22:48   (   0.02,-137.11) (   0.87,-133.18)  446.62                80
 07/17/2019   10:41:41   (  -0.03,-137.11) (   0.24,-138.41)  147.63                80