Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/09/2019   22:36:21   (   0.02,-137.17) (   0.20,-136.46)   81.64                80
 07/12/2019   10:36:18   (  -0.02,-137.17) (  -0.03,-137.09)    8.89                80
 07/14/2019   22:39:04   (   0.02,-137.12) (  -0.10,-137.77)   73.46                80
 07/15/2019   22:22:48   (   0.02,-137.10) (   0.89,-133.19)  446.12                80
 07/17/2019   10:41:41   (  -0.03,-137.10) (   0.28,-138.40)  147.79                80
 07/18/2019   10:25:26   (  -0.02,-137.09) (  -0.76,-133.83)  371.43                80
 07/19/2019   22:44:26   (   0.03,-137.04) (  -0.41,-139.07)  231.50                80
 07/20/2019   22:28:11   (   0.02,-137.02) (   0.58,-134.49)  287.64                80
 07/22/2019   10:47:03   (  -0.03,-137.01) (   0.60,-139.70)  306.89                80
 07/23/2019   10:30:49   (  -0.03,-136.99) (  -0.45,-135.13)  211.85                80