Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 4 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/26/2019   09:52:43   (   0.07,-127.93) (  -0.36,-126.14)  205.06                80
 04/27/2019   22:14:23   (  -0.06,-127.99) (  -0.85,-131.38)  387.14                80
 04/28/2019   21:58:09   (  -0.07,-128.02) (   0.18,-126.81)  137.12                80
 04/30/2019   10:19:42   (   0.06,-128.06) (   0.94,-132.03)  452.58                80
 05/01/2019   09:58:08   (   0.07,-128.08) (  -0.10,-127.46)   71.28                80
 05/03/2019   22:00:54   (  -0.06,-128.15) (  -0.08,-128.13)    3.00                80
 05/06/2019   10:06:12   (   0.05,-128.20) (   0.16,-128.79)   65.85                80
 05/07/2019   09:44:37   (   0.06,-128.22) (  -0.81,-124.20)  456.98                80
 05/08/2019   22:06:18   (  -0.05,-128.25) (  -0.34,-129.45)  138.36                80
 05/09/2019   21:50:04   (  -0.06,-128.26) (   0.69,-124.89)  384.25                80