Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 5 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)
 05/11/2019   10:08:56   (   0.05,-128.30) (   0.47,-130.09)  204.08                80
 05/12/2019   09:52:41   (   0.06,-128.32) (  -0.57,-125.52)  318.56                80
 05/13/2019   22:11:42   (  -0.05,-128.34) (  -0.60,-130.77)  277.13                80
 05/14/2019   21:55:28   (  -0.06,-128.36) (   0.44,-126.20)  245.53                80
 05/16/2019   10:14:20   (   0.04,-128.38) (   0.71,-131.42)  345.89                80
 05/17/2019   09:58:06   (   0.05,-128.39) (  -0.32,-126.85)  176.37                80
 05/18/2019   22:17:07   (  -0.03,-128.40) (  -0.84,-132.10)  420.51                80
 05/19/2019   22:00:52   (  -0.04,-128.41) (   0.13,-127.51)  101.66                80
 05/21/2019   10:19:44   (   0.02,-128.43) (   1.01,-132.73)  490.36                80
 05/22/2019   10:03:29   (   0.03,-128.44) (  -0.02,-128.16)   31.38                80