Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 10 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/07/2019   22:33:02   (   0.01,-137.20) (   0.34,-135.73)  167.41                80
 10/09/2019   10:51:53   (  -0.02,-137.21) (   0.81,-140.94)  424.62                80
 10/10/2019   10:35:38   (  -0.01,-137.21) (  -0.19,-136.36)   96.45                80
 10/12/2019   22:38:23   (   0.01,-137.19) (   0.07,-137.03)   18.53                80
 10/15/2019   10:38:19   (  -0.01,-137.18) (   0.08,-137.66)   54.13                80
 10/16/2019   10:22:04   (  -0.00,-137.17) (  -0.92,-133.08)  466.08                80
 10/17/2019   22:43:44   (  -0.01,-137.14) (  -0.26,-138.32)  133.98                80
 10/18/2019   22:22:09   (  -0.01,-137.13) (   0.75,-133.75)  385.43                80
 10/20/2019   10:46:20   (   0.01,-137.11) (   0.41,-138.95)  209.61                80