Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/13/2021   10:26:18   (   0.06,-128.12) (   0.92,-131.90)  431.32                80
 05/14/2021   10:04:41   (   0.06,-128.14) (  -0.11,-127.31)   94.18                80
 05/16/2021   22:10:00   (  -0.06,-128.14) (  -0.01,-127.94)   23.04                80
 05/19/2021   10:12:30   (   0.07,-128.26) (   0.11,-128.54)   30.67                80
 05/20/2021   09:50:53   (   0.06,-128.28) (  -0.93,-123.95)  494.26                80
 05/21/2021   22:12:28   (  -0.07,-128.24) (  -0.29,-129.15)  103.96                80
 05/22/2021   21:56:11   (  -0.07,-128.26) (   0.75,-124.56)  421.15                80
 05/24/2021   10:17:39   (   0.07,-128.36) (   0.38,-129.75)  158.29                80
 05/25/2021   09:56:02   (   0.06,-128.37) (  -0.66,-125.16)  365.80                80