Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 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)
 07/29/2021   11:05:57   (   0.04,-137.21) (   0.93,-141.25)  460.27                80
 07/30/2021   10:44:19   (   0.04,-137.21) (  -0.06,-136.65)   63.35                80
 08/01/2021   22:46:58   (  -0.03,-137.21) (  -0.02,-137.28)    8.37                80
 08/04/2021   10:52:06   (   0.02,-137.21) (   0.19,-137.86)   74.58                80
 08/05/2021   10:30:30   (  -0.02,-137.20) (  -0.92,-133.29)  447.15                80
 08/06/2021   22:52:05   (   0.02,-137.18) (  -0.26,-138.49)  148.74                80
 08/07/2021   22:35:47   (   0.01,-137.17) (   0.74,-133.89)  373.58                80
 08/09/2021   10:57:14   (  -0.01,-137.17) (   0.44,-139.07)  217.05                80
 08/10/2021   10:35:37   (  -0.01,-137.15) (  -0.62,-134.48)  304.83                80