Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/12/2019   22:44:36   (   0.01,-137.18) (  -0.42,-139.06)  214.22                80
 06/13/2019   22:28:21   (   0.01,-137.18) (   0.63,-134.50)  306.68                80
 06/15/2019   10:49:53   (  -0.02,-137.20) (   0.56,-139.70)  284.56                80
 06/16/2019   10:28:18   (  -0.02,-137.20) (  -0.48,-135.13)  235.64                80
 06/17/2019   22:49:59   (   0.03,-137.16) (  -0.68,-140.38)  366.31                80
 06/18/2019   22:33:44   (   0.03,-137.15) (   0.31,-135.80)  153.90                80
 06/20/2019   10:55:16   (  -0.03,-137.17) (   0.83,-141.01)  437.98                80
 06/21/2019   10:33:42   (  -0.03,-137.16) (  -0.22,-136.45)   81.78                80
 06/23/2019   22:39:08   (   0.03,-137.10) (   0.05,-137.12)    2.84                80