Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 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)
 06/18/2019   22:33:44   (   0.00,-137.19) (   0.30,-135.80)  158.34                80
 06/20/2019   10:55:16   (  -0.00,-137.21) (   0.83,-141.01)  432.87                80
 06/21/2019   10:33:41   (   0.01,-137.20) (  -0.15,-136.43)   87.66                80
 06/23/2019   22:39:06   (  -0.01,-137.16) (  -0.02,-137.10)    6.93                80
 06/26/2019   10:41:43   (   0.01,-137.17) (   0.17,-137.73)   65.19                80
 06/27/2019   10:20:09   (   0.02,-137.15) (  -0.87,-133.17)  454.59                80
 06/28/2019   22:41:49   (  -0.01,-137.11) (  -0.33,-138.40)  148.49                80
 06/29/2019   22:25:35   (  -0.01,-137.09) (   0.72,-133.84)  370.90                80
 07/01/2019   10:44:27   (   0.00,-137.09) (   0.43,-139.05)  222.80                80