Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/14/2019   10:55:22   (   0.00,-137.21) (   0.82,-140.99)  429.36                80
 05/15/2019   10:33:47   (   0.00,-137.21) (  -0.15,-136.41)   91.30                80
 05/17/2019   22:39:14   (  -0.01,-137.18) (   0.03,-137.09)   10.58                80
 05/20/2019   10:41:50   (   0.01,-137.19) (   0.13,-137.72)   60.40                80
 05/21/2019   10:20:16   (   0.00,-137.18) (  -0.90,-133.15)  459.38                80
 05/22/2019   22:41:57   (  -0.00,-137.13) (  -0.26,-138.40)  143.69                80
 05/23/2019   22:25:42   (  -0.00,-137.12) (   0.72,-133.82)  376.12                80
 05/25/2019   10:47:14   (  -0.00,-137.14) (   0.42,-139.03)  215.73                80
 05/26/2019   10:25:40   (  -0.00,-137.13) (  -0.62,-134.47)  303.54                80