Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 4 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)
 04/13/2019   10:41:53   (   0.00,-137.21) (   0.08,-137.68)   52.42                80
 04/14/2019   10:20:18   (  -0.00,-137.20) (  -0.89,-133.09)  467.61                80
 04/15/2019   22:41:59   (   0.00,-137.18) (  -0.25,-138.35)  133.11                80
 04/16/2019   22:25:45   (   0.00,-137.17) (   0.78,-133.78)  387.16                80
 04/18/2019   10:47:17   (  -0.00,-137.18) (   0.42,-138.98)  205.73                80
 04/19/2019   10:25:42   (  -0.00,-137.17) (  -0.61,-134.42)  313.85                80
 04/20/2019   22:47:23   (  -0.00,-137.13) (  -0.58,-139.66)  288.37                80
 04/21/2019   22:31:08   (  -0.00,-137.12) (   0.45,-135.09)  231.28                80
 04/23/2019   10:52:42   (  -0.00,-137.13) (   0.69,-140.31)  361.93                80
 04/24/2019   10:31:06   (   0.00,-137.11) (  -0.29,-135.73)  156.94                80
 04/25/2019   22:52:46   (  -0.00,-137.05) (  -0.91,-140.96)  447.13                80
 04/26/2019   22:36:32   (  -0.00,-137.03) (   0.13,-136.40)   71.86                80