Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/11/2021   22:04:50   (  -0.06,-128.01) (   0.20,-126.71)  147.18                80
 05/13/2021   10:26:18   (   0.06,-128.12) (   0.94,-131.90)  431.33                80
 05/14/2021   10:04:42   (   0.05,-128.14) (  -0.16,-127.32)   94.21                80
 05/16/2021   22:09:59   (  -0.06,-128.14) (  -0.02,-127.94)   23.08                80
 05/19/2021   10:12:30   (   0.06,-128.26) (   0.12,-128.53)   30.53                80
 05/20/2021   09:50:53   (   0.06,-128.28) (  -0.92,-123.95)  494.34                80
 05/21/2021   22:12:28   (  -0.07,-128.24) (  -0.29,-129.15)  103.86                80
 05/22/2021   21:56:11   (  -0.06,-128.26) (   0.74,-124.56)  421.29                80
 05/24/2021   10:17:39   (   0.06,-128.36) (   0.38,-129.75)  158.12                80