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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/17/2019   22:49:59   (   0.01,-137.19) (  -0.70,-140.37)  363.20                80
 06/18/2019   22:33:44   (   0.01,-137.18) (   0.34,-135.80)  157.64                80
 06/20/2019   10:55:16   (  -0.01,-137.20) (   0.85,-141.01)  433.74                80
 06/21/2019   10:33:41   (  -0.00,-137.19) (  -0.20,-136.44)   86.66                80
 06/23/2019   22:39:07   (  -0.00,-137.15) (   0.02,-137.11)    5.47                80
 06/26/2019   10:41:44   (   0.00,-137.15) (   0.13,-137.74)   67.00                80
 06/27/2019   10:20:08   (   0.01,-137.14) (  -0.85,-133.16)  452.59                80
 06/28/2019   22:41:50   (   0.00,-137.09) (  -0.29,-138.41)  150.81                80
 06/29/2019   22:25:34   (  -0.00,-137.07) (   0.70,-133.83)  368.42                80