Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 4 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/21/2019   22:31:08   (  -0.00,-137.19) (   0.46,-135.09)  239.84                80
 04/23/2019   10:52:42   (   0.00,-137.21) (   0.67,-140.31)  352.58                80
 04/24/2019   10:31:06   (  -0.00,-137.20) (  -0.30,-135.73)  167.69                80
 04/25/2019   22:52:47   (   0.00,-137.18) (  -0.84,-140.98)  432.81                80
 04/26/2019   22:36:33   (   0.00,-137.17) (   0.19,-136.41)   87.63                80
 04/29/2019   10:36:31   (  -0.00,-137.18) (  -0.04,-137.05)   14.95                80
 05/01/2019   22:39:17   (   0.00,-137.13) (  -0.13,-137.72)   67.22                80
 05/02/2019   22:23:02   (   0.01,-137.12) (   0.91,-133.15)  452.49                80
 05/04/2019   10:44:34   (  -0.01,-137.12) (   0.27,-138.36)  140.92                80