Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 7 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/10/2019   22:14:14   (   0.16,-127.63) (  -0.68,-131.46)  436.86                80
 07/11/2019   21:57:58   (   0.15,-127.69) (   0.31,-126.88)   91.69                80
 07/13/2019   10:16:52   (  -0.18,-127.82) (   0.80,-132.11)  489.21                80
 07/14/2019   10:00:37   (  -0.17,-127.88) (  -0.25,-127.54)   38.74                80
 07/16/2019   22:00:43   (   0.19,-128.01) (   0.12,-128.22)   23.94                80
 07/19/2019   10:03:22   (  -0.20,-128.19) (  -0.05,-128.87)   77.41                80
 07/20/2019   09:47:07   (  -0.19,-128.25) (  -1.10,-124.30)  450.19                80
 07/21/2019   22:06:08   (   0.21,-128.31) (  -0.07,-129.55)  140.97                80
 07/22/2019   21:49:53   (   0.20,-128.37) (   0.98,-124.98)  386.67                80