Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 4 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2019   22:41:59   (   0.00,-137.19) (  -0.26,-138.34)  131.35                80
 04/16/2019   22:25:44   (   0.00,-137.19) (   0.77,-133.78)  389.52                80
 04/18/2019   10:47:17   (  -0.00,-137.21) (   0.42,-138.98)  202.78                80
 04/19/2019   10:25:42   (   0.00,-137.20) (  -0.61,-134.41)  317.40                80
 04/20/2019   22:47:23   (   0.00,-137.17) (  -0.58,-139.65)  283.56                80
 04/21/2019   22:31:08   (   0.00,-137.17) (   0.45,-135.08)  236.73                80
 04/23/2019   10:52:41   (  -0.00,-137.18) (   0.69,-140.30)  355.84                80
 04/24/2019   10:31:07   (   0.00,-137.17) (  -0.35,-135.74)  163.64                80
 04/25/2019   22:52:47   (   0.00,-137.12) (  -0.85,-140.98)  439.20                80
 04/26/2019   22:36:33   (   0.00,-137.11) (   0.19,-136.41)   80.45                80
 04/29/2019   10:36:31   (  -0.01,-137.10) (  -0.04,-137.05)    6.85                80