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   22:28:12   (   0.03,-137.19) (   0.66,-134.50)  307.09                80
 07/22/2019   10:49:44   (  -0.03,-137.20) (   0.51,-139.71)  285.71                80
 07/23/2019   10:28:08   (  -0.03,-137.20) (  -0.47,-135.13)  234.85                80
 07/24/2019   22:49:49   (   0.03,-137.17) (  -0.68,-140.38)  365.08                80
 07/25/2019   22:33:34   (   0.03,-137.17) (   0.37,-135.81)  155.17                80
 07/27/2019   10:55:07   (  -0.04,-137.16) (   0.81,-141.02)  438.90                80
 07/28/2019   10:33:31   (  -0.04,-137.15) (  -0.18,-136.44)   80.60                80
 07/30/2019   22:36:16   (   0.05,-137.09) (   0.02,-137.10)    3.59                80
 08/02/2019   10:38:54   (  -0.05,-137.05) (   0.11,-137.75)   79.26                80