Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/09/2019   22:03:31   (   0.02,-128.37) (   0.03,-128.19)   19.53                80
 06/12/2019   10:03:28   (  -0.02,-128.33) (   0.11,-128.83)   56.73                80
 06/13/2019   09:47:13   (  -0.01,-128.32) (  -0.93,-124.26)  462.79                80
 06/14/2019   22:06:15   (   0.04,-128.29) (  -0.23,-129.51)  138.33                80
 06/15/2019   21:49:59   (   0.03,-128.28) (   0.75,-124.93)  381.13                80
 06/17/2019   10:08:51   (  -0.05,-128.25) (   0.38,-130.14)  215.50                80
 06/18/2019   09:52:37   (  -0.04,-128.23) (  -0.66,-125.57)  303.45                80
 06/19/2019   22:11:38   (   0.07,-128.19) (  -0.49,-130.82)  298.94                80
 06/20/2019   21:55:23   (   0.06,-128.17) (   0.49,-126.24)  220.15                80