Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2019   22:41:24   (   0.02,-137.19) (  -0.22,-138.39)  136.74                80
 09/11/2019   22:25:09   (   0.02,-137.18) (   0.78,-133.81)  383.80                80
 09/13/2019   10:46:40   (  -0.02,-137.18) (   0.40,-139.02)  209.57                80
 09/14/2019   10:25:06   (  -0.02,-137.17) (  -0.65,-134.45)  310.73                80
 09/15/2019   22:46:46   (   0.02,-137.15) (  -0.53,-139.69)  289.29                80
 09/16/2019   22:30:31   (   0.02,-137.14) (   0.47,-135.11)  230.66                80
 09/18/2019   10:49:22   (  -0.02,-137.13) (   0.71,-140.32)  363.78                80
 09/19/2019   10:33:07   (  -0.02,-137.11) (  -0.35,-135.75)  155.61                80
 09/20/2019   22:52:08   (   0.02,-137.07) (  -0.83,-140.99)  446.05                80
 09/21/2019   22:35:52   (   0.02,-137.05) (   0.17,-136.41)   72.75                80