Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 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)
 05/09/2019   10:49:58   (   0.01,-137.20) (   0.57,-139.67)  281.04                80
 05/10/2019   10:28:23   (   0.01,-137.19) (  -0.46,-135.10)  238.70                80
 05/11/2019   22:50:05   (  -0.00,-137.15) (  -0.70,-140.35)  363.84                80
 05/12/2019   22:33:49   (  -0.00,-137.14) (   0.28,-135.77)  155.98                80
 05/14/2019   10:55:21   (   0.00,-137.15) (   0.87,-140.98)  436.42                80
 05/15/2019   10:33:47   (   0.00,-137.14) (  -0.16,-136.41)   82.88                80
 05/17/2019   22:36:33   (  -0.00,-137.07) (  -0.02,-137.08)    2.43                80
 05/20/2019   10:41:51   (  -0.00,-137.06) (   0.13,-137.72)   75.71                80
 05/21/2019   10:20:15   (  -0.00,-137.03) (  -0.85,-133.14)  442.71                80
 05/22/2019   22:41:57   (   0.01,-136.96) (  -0.31,-138.39)  162.65                80