Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/10/2019   10:28:23   (   0.00,-137.19) (  -0.44,-135.09)  238.88                80
 05/11/2019   22:50:04   (  -0.00,-137.15) (  -0.72,-140.34)  363.32                80
 05/12/2019   22:33:50   (  -0.00,-137.15) (   0.31,-135.77)  156.64                80
 05/14/2019   10:55:22   (   0.00,-137.16) (   0.84,-140.98)  435.54                80
 05/15/2019   10:33:47   (   0.00,-137.15) (  -0.13,-136.40)   83.97                80
 05/17/2019   22:36:33   (   0.00,-137.08) (   0.00,-137.08)    0.31                80
 05/20/2019   10:41:51   (  -0.01,-137.07) (   0.11,-137.73)   74.16                80
 05/21/2019   10:20:16   (  -0.02,-137.05) (  -0.87,-133.15)  444.39                80
 05/22/2019   22:41:57   (   0.02,-136.99) (  -0.30,-138.39)  160.69                80
 05/23/2019   22:25:43   (   0.02,-136.96) (   0.74,-133.83)  357.90                80