Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 4 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/14/2019   10:20:18   (   0.00,-137.21) (  -0.92,-133.10)  468.08                80
 04/15/2019   22:41:59   (   0.00,-137.19) (  -0.27,-138.34)  131.78                80
 04/16/2019   22:25:44   (  -0.00,-137.19) (   0.75,-133.77)  388.99                80
 04/18/2019   10:47:17   (   0.00,-137.20) (   0.39,-138.99)  203.26                80
 04/19/2019   10:25:43   (   0.00,-137.20) (  -0.64,-134.42)  316.81                80
 04/20/2019   22:47:23   (  -0.00,-137.16) (  -0.55,-139.66)  284.57                80
 04/21/2019   22:31:09   (   0.00,-137.16) (   0.48,-135.09)  235.56                80
 04/23/2019   10:52:41   (  -0.00,-137.17) (   0.72,-140.30)  357.02                80
 04/24/2019   10:31:07   (  -0.00,-137.16) (  -0.31,-135.73)  162.30                80
 04/25/2019   22:52:47   (  -0.00,-137.11) (  -0.88,-140.97)  440.77                80
 04/26/2019   22:36:32   (  -0.01,-137.09) (   0.15,-136.40)   78.83                80