Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 7 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/25/2019   22:33:33   (   0.02,-137.20) (   0.32,-135.80)  159.13                80
 07/27/2019   10:55:06   (  -0.03,-137.20) (   0.85,-141.01)  434.83                80
 07/28/2019   10:33:31   (  -0.03,-137.19) (  -0.20,-136.44)   85.30                80
 07/30/2019   22:38:56   (   0.03,-137.15) (   0.04,-137.11)    5.18                80
 08/02/2019   10:38:54   (  -0.04,-137.12) (   0.09,-137.75)   71.09                80
 08/03/2019   10:22:38   (  -0.04,-137.11) (  -0.90,-133.17)  448.13                80
 08/04/2019   22:41:39   (   0.04,-137.07) (  -0.24,-138.42)  152.85                80
 08/05/2019   22:25:23   (   0.04,-137.05) (   0.75,-133.84)  366.28                80
 08/07/2019   10:44:16   (  -0.05,-137.03) (   0.43,-139.04)  230.09                80