Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 5 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/25/2019   21:47:21   (  -0.04,-128.45) (   0.89,-124.26)  477.62                80
 05/27/2019   10:06:13   (   0.03,-128.44) (   0.24,-129.47)  117.00                80
 05/28/2019   09:49:57   (   0.03,-128.44) (  -0.74,-124.89)  404.05                80
 05/29/2019   22:09:00   (  -0.02,-128.45) (  -0.37,-130.15)  193.64                80
 05/30/2019   21:52:44   (  -0.02,-128.45) (   0.61,-125.57)  327.38                80
 06/01/2019   10:11:36   (   0.01,-128.43) (   0.52,-130.79)  267.69                80
 06/02/2019   09:55:21   (   0.01,-128.43) (  -0.46,-126.21)  252.54                80
 06/03/2019   22:14:23   (   0.01,-128.41) (  -0.65,-131.47)  347.18                80
 06/04/2019   21:58:08   (   0.00,-128.40) (   0.34,-126.89)  172.86                80
 06/06/2019   10:17:00   (  -0.02,-128.38) (   0.79,-132.10)  423.18                80
 06/07/2019   10:00:45   (  -0.01,-128.37) (  -0.19,-127.52)   96.21                80