Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/20/2019   10:55:15   (  -0.01,-137.20) (   0.86,-141.00)  433.43                80
 06/21/2019   10:33:41   (  -0.00,-137.20) (  -0.18,-136.44)   87.02                80
 06/23/2019   22:39:07   (  -0.01,-137.16) (   0.01,-137.10)    6.25                80
 06/26/2019   10:41:44   (   0.01,-137.16) (   0.14,-137.74)   66.11                80
 06/27/2019   10:20:09   (   0.01,-137.14) (  -0.91,-133.17)  453.50                80
 06/28/2019   22:41:49   (  -0.00,-137.10) (  -0.29,-138.41)  149.41                80
 06/29/2019   22:25:34   (  -0.00,-137.08) (   0.69,-133.83)  369.85                80
 07/01/2019   10:47:06   (  -0.00,-137.08) (   0.45,-139.04)  224.25                80
 07/02/2019   10:25:32   (  -0.00,-137.05) (  -0.59,-134.48)  294.22                80
 07/03/2019   22:47:12   (   0.00,-136.99) (  -0.60,-139.71)  310.67                80