Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 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)
 03/25/2021   21:56:23   (   0.07,-128.39) (   0.84,-125.02)  384.81                80
 03/27/2021   10:17:50   (  -0.06,-128.37) (   0.37,-130.18)  207.82                80
 03/28/2021   09:56:14   (  -0.07,-128.35) (  -0.71,-125.61)  313.39                80
 03/29/2021   22:17:50   (   0.05,-128.34) (  -0.48,-130.82)  281.47                80
 03/30/2021   22:01:32   (   0.06,-128.33) (   0.55,-126.23)  240.15                80
 04/01/2021   10:23:00   (  -0.05,-128.31) (   0.67,-131.40)  352.60                80
 04/02/2021   10:01:23   (  -0.06,-128.29) (  -0.41,-126.82)  167.81                80
 04/03/2021   22:22:59   (   0.04,-128.26) (  -0.82,-132.02)  429.32                80
 04/04/2021   22:06:41   (   0.05,-128.24) (   0.21,-127.43)   91.60                80
 04/07/2021   10:06:32   (  -0.04,-128.20) (  -0.06,-128.02)   19.22                80