Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/23/2019   22:39:07   (   0.00,-137.18) (   0.05,-137.11)    9.04                80
 06/26/2019   10:41:44   (  -0.00,-137.19) (   0.10,-137.75)   62.87                80
 06/27/2019   10:20:09   (   0.00,-137.18) (  -0.88,-133.17)  457.26                80
 06/28/2019   22:41:50   (   0.01,-137.14) (  -0.27,-138.42)  144.68                80
 06/29/2019   22:25:35   (   0.01,-137.13) (   0.72,-133.84)  375.07                80
 07/01/2019   10:47:07   (  -0.01,-137.13) (   0.43,-139.05)  218.48                80
 07/02/2019   10:25:32   (  -0.01,-137.11) (  -0.61,-134.48)  300.49                80
 07/03/2019   22:47:13   (   0.01,-137.06) (  -0.59,-139.72)  303.43                80
 07/04/2019   22:30:58   (   0.01,-137.04) (   0.46,-135.15)  215.37                80