Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 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)
 09/10/2019   10:00:09   (   0.36,-128.23) (   0.35,-128.06)   18.59                80
 09/12/2019   22:02:55   (  -0.35,-128.14) (  -0.47,-128.73)   67.57                80
 09/13/2019   21:46:40   (  -0.35,-128.12) (   0.53,-124.16)  451.34                80
 09/15/2019   10:08:11   (   0.34,-128.12) (   0.65,-129.36)  142.49                80
 09/16/2019   09:46:37   (   0.35,-128.09) (  -0.41,-124.80)  375.87                80
 09/17/2019   22:08:17   (  -0.34,-128.01) (  -0.77,-130.04)  230.08                80
 09/18/2019   21:52:01   (  -0.34,-127.99) (   0.23,-125.46)  288.27                80
 09/20/2019   10:10:53   (   0.33,-127.98) (   0.94,-130.66)  306.04                80
 09/21/2019   09:51:57   (   0.33,-127.94) (  -0.06,-126.08)  211.42                80