Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 5 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2019   09:58:07   (   0.07,-128.08) (  -0.07,-127.46)   71.28                80
 05/03/2019   22:03:34   (  -0.06,-128.15) (  -0.05,-128.14)    2.42                80
 05/06/2019   10:06:12   (   0.05,-128.20) (   0.18,-128.78)   65.70                80
 05/07/2019   09:44:37   (   0.06,-128.22) (  -0.85,-124.21)  457.11                80
 05/08/2019   22:06:19   (  -0.05,-128.25) (  -0.30,-129.46)  137.78                80
 05/09/2019   21:50:03   (  -0.06,-128.26) (   0.67,-124.88)  384.83                80
 05/11/2019   10:08:56   (   0.05,-128.28) (   0.43,-130.10)  207.45                80
 05/12/2019   09:52:41   (   0.06,-128.29) (  -0.55,-125.52)  314.77                80
 05/13/2019   22:11:42   (  -0.05,-128.31) (  -0.61,-130.77)  281.32                80
 05/14/2019   21:55:28   (  -0.05,-128.32) (   0.43,-126.21)  240.91                80