Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 5 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/06/2019   22:44:41   (   0.01,-137.19) (  -0.41,-139.03)  210.37                80
 05/07/2019   22:28:26   (   0.01,-137.19) (   0.63,-134.46)  310.27                80
 05/09/2019   10:49:59   (  -0.01,-137.20) (   0.53,-139.68)  281.82                80
 05/10/2019   10:28:24   (  -0.01,-137.19) (  -0.50,-135.11)  238.02                80
 05/11/2019   22:50:04   (   0.00,-137.15) (  -0.72,-140.34)  364.11                80
 05/12/2019   22:33:50   (   0.00,-137.14) (   0.31,-135.77)  155.75                80
 05/14/2019   10:55:22   (  -0.00,-137.15) (   0.84,-140.99)  436.71                80
 05/15/2019   10:33:48   (  -0.00,-137.14) (  -0.19,-136.42)   82.66                80
 05/17/2019   22:36:34   (   0.00,-137.07) (  -0.00,-137.09)    1.54                80