Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/09/2021   09:59:32   (   0.06,-127.99) (  -0.39,-126.10)  215.19                80
 05/10/2021   22:21:07   (  -0.06,-127.98) (  -0.82,-131.30)  379.44                80
 05/11/2021   22:04:50   (  -0.06,-128.01) (   0.22,-126.72)  147.11                80
 05/13/2021   10:26:18   (   0.06,-128.12) (   0.93,-131.90)  431.34                80
 05/14/2021   10:04:41   (   0.05,-128.14) (  -0.11,-127.31)   94.22                80
 05/16/2021   22:10:00   (  -0.05,-128.14) (  -0.01,-127.94)   23.19                80
 05/19/2021   10:12:30   (   0.06,-128.27) (   0.11,-128.54)   30.34                80
 05/20/2021   09:50:53   (   0.06,-128.29) (  -0.93,-123.95)  494.55                80
 05/21/2021   22:12:28   (  -0.06,-128.25) (  -0.29,-129.15)  103.56                80
 05/22/2021   21:56:11   (  -0.06,-128.27) (   0.75,-124.56)  421.63                80