Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/13/2019   22:28:21   (   0.01,-137.19) (   0.59,-134.49)  307.83                80
 06/15/2019   10:49:53   (  -0.02,-137.22) (   0.53,-139.70)  282.93                80
 06/16/2019   10:28:18   (  -0.02,-137.22) (  -0.51,-135.14)  237.75                80
 06/17/2019   22:49:59   (   0.03,-137.19) (  -0.71,-140.37)  363.28                80
 06/18/2019   22:33:44   (   0.03,-137.18) (   0.34,-135.80)  157.38                80
 06/20/2019   10:55:16   (  -0.03,-137.20) (   0.84,-141.01)  433.99                80
 06/21/2019   10:33:41   (  -0.03,-137.20) (  -0.20,-136.44)   86.20                80
 06/23/2019   22:39:07   (   0.04,-137.15) (   0.04,-137.11)    4.33                80
 06/26/2019   10:41:44   (  -0.04,-137.15) (   0.11,-137.75)   67.78                80