Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/23/2019   22:39:07   (   0.01,-137.18) (   0.05,-137.11)    8.89                80
 06/26/2019   10:41:44   (  -0.00,-137.18) (   0.10,-137.75)   63.40                80
 06/27/2019   10:20:09   (   0.00,-137.18) (  -0.88,-133.17)  456.59                80
 06/28/2019   22:41:50   (   0.01,-137.14) (  -0.27,-138.41)  145.31                80
 06/29/2019   22:25:35   (   0.01,-137.12) (   0.72,-133.84)  374.26                80
 07/01/2019   10:47:07   (  -0.01,-137.12) (   0.42,-139.05)  219.66                80
 07/02/2019   10:25:32   (  -0.01,-137.10) (  -0.62,-134.48)  299.18                80
 07/03/2019   22:47:13   (   0.01,-137.04) (  -0.58,-139.72)  304.59                80
 07/04/2019   22:30:57   (   0.01,-137.02) (   0.41,-135.14)  214.09                80
 07/06/2019   10:49:50   (  -0.00,-137.01) (   0.75,-140.35)  380.80                80