Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2020   10:39:16   (   0.04,-137.19) (  -0.09,-136.58)   69.63                80
 09/19/2020   22:39:18   (  -0.04,-137.19) (  -0.05,-137.23)    4.90                80
 09/22/2020   10:41:51   (   0.03,-137.17) (   0.20,-137.83)   76.25                80
 09/23/2020   10:25:34   (   0.03,-137.16) (  -0.82,-133.25)  444.73                80
 09/24/2020   22:44:32   (  -0.03,-137.14) (  -0.35,-138.48)  153.26                80
 09/25/2020   22:28:16   (  -0.02,-137.12) (   0.67,-133.89)  367.38                80
 09/27/2020   10:47:06   (   0.01,-137.10) (   0.43,-139.10)  226.62                80
 09/28/2020   10:30:50   (   0.01,-137.09) (  -0.59,-134.51)  293.89                80
 09/29/2020   22:49:48   (  -0.01,-137.06) (  -0.58,-139.74)  304.59                80