Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 6 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2019   10:33:41   (  -0.01,-137.21) (  -0.21,-136.44)   87.96                80
 06/23/2019   22:39:07   (  -0.00,-137.18) (   0.03,-137.11)    8.66                80
 06/26/2019   10:41:44   (   0.00,-137.19) (   0.12,-137.74)   62.74                80
 06/27/2019   10:20:09   (   0.01,-137.18) (  -0.87,-133.16)  457.37                80
 06/28/2019   22:41:50   (   0.00,-137.14) (  -0.28,-138.41)  144.68                80
 06/29/2019   22:25:35   (   0.00,-137.13) (   0.76,-133.85)  375.07                80
 07/01/2019   10:47:07   (  -0.01,-137.13) (   0.44,-139.05)  218.36                80
 07/02/2019   10:25:32   (  -0.01,-137.12) (  -0.60,-134.48)  300.62                80
 07/03/2019   22:47:13   (   0.01,-137.06) (  -0.59,-139.72)  303.41                80
 07/04/2019   22:30:58   (   0.00,-137.03) (   0.45,-135.15)  215.41                80