Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 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)
 09/12/2019   22:02:55   (  -0.35,-128.14) (  -0.49,-128.73)   67.65                80
 09/13/2019   21:46:39   (  -0.35,-128.12) (   0.51,-124.15)  451.16                80
 09/15/2019   10:08:12   (   0.34,-128.11) (   0.61,-129.37)  143.07                80
 09/16/2019   09:46:36   (   0.35,-128.08) (  -0.39,-124.79)  375.14                80
 09/17/2019   22:08:17   (  -0.34,-128.01) (  -0.79,-130.03)  230.70                80
 09/18/2019   21:52:01   (  -0.34,-127.98) (   0.21,-125.45)  287.54                80
 09/20/2019   10:13:33   (   0.33,-127.97) (   0.91,-130.67)  307.17                80
 09/21/2019   09:51:58   (   0.33,-127.93) (  -0.09,-126.09)  210.16                80
 09/22/2019   22:13:38   (  -0.32,-127.84) (  -1.09,-131.33)  398.14                80
 09/23/2019   21:57:23   (  -0.32,-127.80) (  -0.09,-126.75)  119.05                80