Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 8 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/21/2019   22:22:36   (   0.04,-137.20) (   0.95,-133.18)  458.71                80
 08/23/2019   10:44:08   (  -0.04,-137.21) (   0.21,-138.39)  134.25                80
 08/24/2019   10:22:33   (  -0.04,-137.21) (  -0.79,-133.82)  386.74                80
 08/25/2019   22:44:13   (   0.05,-137.20) (  -0.37,-139.06)  211.47                80
 08/26/2019   22:27:59   (   0.05,-137.20) (   0.69,-134.49)  308.98                80
 08/28/2019   10:49:30   (  -0.05,-137.19) (   0.53,-139.69)  285.56                80
 08/29/2019   10:27:56   (  -0.06,-137.18) (  -0.53,-135.13)  234.50                80
 08/30/2019   22:49:36   (   0.06,-137.16) (  -0.63,-140.37)  364.93                80
 08/31/2019   22:33:20   (   0.06,-137.15) (   0.36,-135.79)  155.00                80
 09/02/2019   10:54:53   (  -0.06,-137.14) (   0.79,-141.00)  440.04                80
 09/03/2019   10:33:17   (  -0.06,-137.12) (  -0.21,-136.42)   79.55                80