Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2020   22:53:28   (   0.00,-137.20) (  -0.70,-140.38)  362.54                80
 05/21/2020   22:31:51   (   0.01,-137.20) (   0.30,-135.80)  159.64                80
 05/23/2020   10:56:02   (  -0.01,-137.20) (   0.84,-140.99)  432.05                80
 05/24/2020   10:34:25   (  -0.01,-137.20) (  -0.16,-136.41)   89.57                80
 05/26/2020   22:39:48   (   0.00,-137.18) (   0.01,-137.06)   14.03                80
 05/29/2020   10:42:22   (  -0.00,-137.16) (   0.13,-137.67)   58.62                80
 05/30/2020   10:20:46   (   0.00,-137.15) (  -0.93,-133.10)  462.06                80
 05/31/2020   22:42:25   (  -0.00,-137.13) (  -0.28,-138.32)  136.27                80
 06/01/2020   22:26:09   (  -0.00,-137.11) (   0.78,-133.75)  384.16                80