Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2019   22:28:11   (   0.02,-137.19) (   0.63,-134.50)  307.29                80
 07/22/2019   10:49:43   (  -0.03,-137.20) (   0.54,-139.71)  285.64                80
 07/23/2019   10:28:09   (  -0.02,-137.20) (  -0.51,-135.14)  234.90                80
 07/24/2019   22:49:48   (   0.03,-137.17) (  -0.71,-140.37)  364.82                80
 07/25/2019   22:33:34   (   0.03,-137.17) (   0.34,-135.80)  155.39                80
 07/27/2019   10:55:06   (  -0.03,-137.16) (   0.83,-141.01)  438.78                80
 07/28/2019   10:33:32   (  -0.03,-137.15) (  -0.21,-136.45)   80.71                80
 07/30/2019   22:38:56   (   0.04,-137.09) (   0.06,-137.11)    2.78                80
 08/02/2019   10:38:53   (  -0.05,-137.05) (   0.13,-137.74)   79.15                80
 08/03/2019   10:22:39   (  -0.05,-137.03) (  -0.92,-133.17)  439.45                80