Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 5 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/01/2020   22:12:53   (   0.12,-128.23) (  -0.35,-130.34)  240.71                80
 05/02/2020   21:51:18   (   0.13,-128.24) (   0.71,-125.77)  282.23                80
 05/04/2020   10:15:27   (  -0.10,-128.27) (   0.53,-130.95)  306.00                80
 05/05/2020   09:53:51   (  -0.12,-128.28) (  -0.53,-126.38)  216.29                80
 05/06/2020   22:18:10   (   0.09,-128.27) (  -0.66,-131.60)  379.45                80
 05/07/2020   21:56:34   (   0.11,-128.28) (   0.40,-127.03)  142.85                80
 05/09/2020   10:20:44   (  -0.08,-128.31) (   0.77,-132.22)  445.80                80
 05/10/2020   09:59:08   (  -0.10,-128.31) (  -0.23,-127.64)   75.83                80
 05/12/2020   22:01:51   (   0.09,-128.29) (   0.10,-128.29)    1.53                80