Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/28/2019   22:41:50   (   0.01,-137.19) (  -0.29,-138.41)  139.88                80
 06/29/2019   22:25:35   (   0.01,-137.18) (   0.76,-133.84)  380.62                80
 07/01/2019   10:47:07   (  -0.02,-137.19) (   0.38,-139.06)  212.36                80
 07/02/2019   10:25:32   (  -0.02,-137.18) (  -0.60,-134.48)  307.47                80
 07/03/2019   22:47:13   (   0.01,-137.14) (  -0.54,-139.73)  294.19                80
 07/04/2019   22:30:58   (   0.01,-137.13) (   0.45,-135.15)  225.46                80
 07/06/2019   10:49:50   (  -0.00,-137.12) (   0.70,-140.36)  368.55                80
 07/07/2019   10:33:35   (   0.00,-137.10) (  -0.29,-135.78)  150.71                80
 07/08/2019   22:52:35   (  -0.00,-137.06) (  -0.90,-141.02)  451.94                80
 07/09/2019   22:36:20   (  -0.01,-137.04) (   0.15,-136.45)   67.22                80