Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2019   10:41:51   (   0.00,-137.18) (   0.11,-137.72)   61.19                80
 05/21/2019   10:20:16   (   0.00,-137.17) (  -0.92,-133.16)  458.39                80
 05/22/2019   22:41:57   (   0.00,-137.13) (  -0.30,-138.39)  144.50                80
 05/23/2019   22:25:42   (   0.01,-137.12) (   0.74,-133.82)  375.14                80
 05/25/2019   10:47:14   (  -0.01,-137.13) (   0.39,-139.04)  217.36                80
 05/26/2019   10:25:39   (  -0.01,-137.11) (  -0.59,-134.46)  301.73                80
 05/27/2019   22:47:20   (   0.02,-137.05) (  -0.58,-139.71)  302.44                80
 05/28/2019   22:31:06   (   0.02,-137.04) (   0.47,-135.14)  216.75                80
 05/30/2019   10:52:37   (  -0.02,-137.04) (   0.72,-140.34)  375.98                80
 05/31/2019   10:31:03   (  -0.02,-137.02) (  -0.32,-135.77)  142.46                80