Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/05/2021   23:01:56   (  -0.03,-137.17) (  -0.75,-140.44)  373.07                80
 07/06/2021   22:40:18   (  -0.03,-137.17) (   0.30,-135.86)  150.12                80
 07/08/2021   11:04:25   (   0.02,-137.17) (   0.90,-141.02)  439.24                80
 07/09/2021   10:42:47   (   0.01,-137.17) (  -0.15,-136.44)   83.39                80
 07/11/2021   22:45:26   (  -0.01,-137.15) (   0.03,-137.06)   10.48                80
 07/14/2021   10:50:35   (   0.01,-137.14) (   0.13,-137.64)   57.79                80
 07/15/2021   10:28:57   (   0.01,-137.13) (  -0.92,-133.06)  464.30                80
 07/16/2021   22:53:13   (  -0.02,-137.10) (  -0.30,-138.26)  132.01                80
 07/17/2021   22:31:35   (  -0.01,-137.09) (   0.76,-133.67)  389.51                80