Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 6 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/14/2020   10:36:35   (   0.01,-137.19) (  -0.07,-136.88)   35.63                80
 06/16/2020   22:41:58   (  -0.01,-137.18) (  -0.09,-137.52)   39.38                80
 06/17/2020   22:20:23   (  -0.00,-137.17) (   0.98,-132.95)  481.86                80
 06/19/2020   10:44:32   (  -0.00,-137.16) (   0.20,-138.14)  111.23                80
 06/20/2020   10:22:55   (  -0.01,-137.15) (  -0.81,-133.56)  409.43                80
 06/21/2020   22:44:35   (   0.01,-137.13) (  -0.35,-138.79)  188.93                80
 06/22/2020   22:28:18   (   0.01,-137.11) (   0.66,-134.21)  331.37                80
 06/24/2020   10:49:48   (  -0.01,-137.09) (   0.51,-139.39)  263.12                80
 06/25/2020   10:28:11   (  -0.00,-137.07) (  -0.49,-134.81)  256.76                80
 06/26/2020   22:49:50   (   0.00,-137.03) (  -0.65,-140.04)  342.76                80
 06/27/2020   22:33:34   (   0.00,-137.01) (   0.36,-135.46)  176.89                80