Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/28/2021   22:51:59   (   0.03,-137.20) (  -0.27,-138.52)  150.98                80
 04/29/2021   22:30:22   (   0.03,-137.19) (   0.76,-133.94)  371.39                80
 05/01/2021   10:54:30   (  -0.02,-137.18) (   0.40,-139.11)  220.25                80
 05/02/2021   10:32:53   (  -0.02,-137.17) (  -0.63,-134.53)  301.69                80
 05/03/2021   22:54:28   (   0.01,-137.16) (  -0.58,-139.73)  293.50                80
 05/04/2021   22:38:10   (   0.01,-137.15) (   0.45,-135.14)  228.48                80
 05/06/2021   10:59:39   (  -0.01,-137.13) (   0.71,-140.32)  363.43                80
 05/07/2021   10:38:01   (  -0.01,-137.12) (  -0.33,-135.73)  158.29                80
 05/08/2021   22:59:37   (   0.01,-137.10) (  -0.88,-140.93)  437.57                80
 05/09/2021   22:43:19   (   0.01,-137.09) (   0.15,-136.35)   84.00                80