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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/01/2020   10:27:11   (   0.03,-137.20) (  -0.61,-134.46)  312.87                80
 08/02/2020   22:48:50   (  -0.01,-137.20) (  -0.55,-139.69)  283.80                80
 08/03/2020   22:32:33   (  -0.01,-137.20) (   0.47,-135.11)  238.15                80
 08/05/2020   10:51:23   (   0.00,-137.20) (   0.69,-140.30)  353.20                80
 08/06/2020   10:35:07   (   0.01,-137.20) (  -0.32,-135.72)  168.74                80
 08/07/2020   22:54:05   (  -0.01,-137.19) (  -0.83,-140.95)  427.94                80
 08/08/2020   22:37:49   (  -0.01,-137.18) (   0.19,-136.36)   93.82                80
 08/10/2020   10:56:39   (   0.01,-137.18) (   0.98,-141.56)  498.25                80
 08/11/2020   10:40:23   (   0.01,-137.18) (  -0.04,-136.98)   22.92                80
 08/13/2020   22:40:24   (   0.01,-137.14) (  -0.08,-137.62)   54.76                80
 08/14/2020   22:24:08   (   0.01,-137.13) (   0.93,-133.04)  465.74                80