Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 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)
 06/10/2019   10:44:29   (   0.01,-137.21) (   0.26,-138.39)  133.91                80
 06/11/2019   10:22:54   (   0.01,-137.21) (  -0.72,-133.81)  387.02                80
 06/12/2019   22:44:35   (  -0.01,-137.18) (  -0.45,-139.06)  214.01                80
 06/13/2019   22:28:21   (  -0.00,-137.18) (   0.60,-134.49)  306.68                80
 06/15/2019   10:49:53   (  -0.01,-137.20) (   0.53,-139.70)  284.76                80
 06/16/2019   10:28:18   (  -0.01,-137.19) (  -0.45,-135.12)  235.40                80
 06/17/2019   22:49:59   (   0.01,-137.15) (  -0.70,-140.37)  366.97                80
 06/18/2019   22:33:43   (   0.00,-137.14) (   0.28,-135.79)  153.17                80
 06/20/2019   10:55:16   (  -0.00,-137.16) (   0.85,-141.01)  438.76                80
 06/21/2019   10:33:40   (   0.00,-137.14) (  -0.13,-136.43)   81.00                80
 06/23/2019   22:36:26   (  -0.01,-137.08) (  -0.02,-137.10)    2.98                80