Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/09/2019   10:49:59   (  -0.00,-137.20) (   0.53,-139.68)  281.12                80
 05/10/2019   10:28:23   (  -0.00,-137.19) (  -0.45,-135.09)  238.77                80
 05/11/2019   22:50:04   (   0.00,-137.15) (  -0.71,-140.34)  363.43                80
 05/12/2019   22:33:50   (   0.00,-137.15) (   0.32,-135.78)  156.53                80
 05/14/2019   10:55:22   (  -0.00,-137.16) (   0.83,-140.99)  435.64                80
 05/15/2019   10:33:47   (  -0.00,-137.15) (  -0.15,-136.41)   83.80                80
 05/17/2019   22:36:34   (   0.01,-137.08) (   0.03,-137.09)    2.49                80
 05/20/2019   10:41:50   (  -0.02,-137.07) (   0.14,-137.72)   74.33                80
 05/21/2019   10:20:16   (  -0.02,-137.05) (  -0.90,-133.15)  444.20                80