Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 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)
 05/12/2019   22:33:50   (  -0.00,-137.18) (   0.30,-135.77)  161.01                80
 05/14/2019   10:55:22   (   0.00,-137.22) (   0.85,-140.98)  429.35                80
 05/15/2019   10:33:47   (   0.00,-137.21) (  -0.19,-136.41)   91.34                80
 05/17/2019   22:39:13   (   0.00,-137.18) (  -0.00,-137.08)   10.89                80
 05/20/2019   10:41:51   (  -0.01,-137.20) (   0.11,-137.73)   60.32                80
 05/21/2019   10:20:17   (  -0.01,-137.19) (  -0.93,-133.16)  459.40                80
 05/22/2019   22:41:58   (   0.02,-137.14) (  -0.24,-138.41)  143.69                80
 05/23/2019   22:25:42   (   0.02,-137.13) (   0.74,-133.83)  376.18                80
 05/25/2019   10:47:15   (  -0.02,-137.15) (   0.40,-139.04)  215.56                80