Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2019   21:53:43   (   0.03,-128.06) (   0.52,-125.91)  245.80                80
 12/24/2019   10:12:36   (  -0.04,-128.14) (   0.60,-131.12)  339.05                80
 12/25/2019   09:56:19   (  -0.03,-128.17) (  -0.37,-126.53)  185.60                80
 12/26/2019   22:15:19   (   0.04,-128.17) (  -0.79,-131.77)  410.72                80
 12/27/2019   21:59:03   (   0.03,-128.19) (   0.23,-127.19)  113.54                80
 12/29/2019   10:17:55   (  -0.04,-128.26) (   0.87,-132.41)  472.15                80
 12/30/2019   10:01:40   (  -0.04,-128.29) (  -0.16,-127.83)   52.12                80
 01/01/2020   22:04:24   (   0.04,-128.31) (   0.02,-128.49)   20.58                80
 01/04/2020   10:04:20   (  -0.04,-128.39) (   0.11,-129.12)   82.84                80