Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/30/2021   10:44:19   (   0.04,-137.21) (  -0.06,-136.65)   62.86                80
 08/01/2021   22:46:58   (  -0.03,-137.21) (  -0.02,-137.28)    7.86                80
 08/04/2021   10:52:06   (   0.02,-137.21) (   0.19,-137.86)   74.76                80
 08/05/2021   10:30:30   (  -0.02,-137.20) (  -0.92,-133.29)  447.02                80
 08/06/2021   22:52:05   (   0.02,-137.19) (  -0.26,-138.49)  147.81                80
 08/07/2021   22:35:47   (   0.01,-137.18) (   0.74,-133.89)  374.56                80
 08/09/2021   10:57:14   (  -0.01,-137.17) (   0.44,-139.07)  216.91                80
 08/10/2021   10:35:37   (  -0.01,-137.16) (  -0.62,-134.48)  305.04                80
 08/11/2021   22:57:12   (   0.01,-137.13) (  -0.55,-139.69)  290.82                80
 08/12/2021   22:40:53   (   0.01,-137.12) (   0.45,-135.09)  230.87                80