Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 4 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/19/2020   22:38:01   (   0.02,-137.19) (  -0.00,-137.37)   20.71                80
 04/22/2020   10:43:16   (  -0.02,-137.19) (   0.15,-137.99)   91.59                80
 04/23/2020   10:21:40   (  -0.02,-137.18) (  -0.85,-133.41)  429.72                80
 04/24/2020   22:43:18   (   0.02,-137.17) (  -0.33,-138.63)  166.95                80
 04/25/2020   22:27:02   (   0.02,-137.17) (   0.72,-134.06)  353.99                80
 04/27/2020   10:48:33   (  -0.01,-137.15) (   0.47,-139.25)  240.16                80
 04/28/2020   10:26:57   (  -0.01,-137.13) (  -0.58,-134.68)  280.12                80
 04/29/2020   22:48:36   (   0.01,-137.11) (  -0.60,-139.90)  318.39                80
 04/30/2020   22:32:19   (   0.01,-137.09) (   0.40,-135.32)  201.58                80