Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 1 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/08/2020   10:29:05   (   0.03,-137.21) (  -0.38,-135.38)  209.09                80
 01/09/2020   22:53:25   (  -0.04,-137.20) (  -0.80,-140.61)  388.91                80
 01/10/2020   22:31:49   (  -0.04,-137.19) (   0.22,-136.04)  131.49                80
 01/12/2020   10:55:59   (   0.04,-137.17) (   0.98,-141.23)  462.67                80
 01/13/2020   10:34:24   (   0.04,-137.16) (  -0.05,-136.65)   57.25                80
 01/15/2020   22:39:48   (  -0.04,-137.12) (  -0.10,-137.31)   22.49                80
 01/16/2020   22:18:12   (  -0.04,-137.10) (   0.93,-132.73)  497.21                80
 01/18/2020   10:42:23   (   0.05,-137.07) (   0.27,-137.93)   97.83                80
 01/19/2020   10:20:47   (   0.04,-137.05) (  -0.77,-133.35)  421.40                80
 01/20/2020   22:45:06   (  -0.06,-137.01) (  -0.42,-138.58)  179.21                80
 01/21/2020   22:23:31   (  -0.05,-136.99) (   0.61,-134.01)  339.71                80