Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/08/2021   10:21:09   (   0.06,-127.95) (   0.66,-130.69)  311.15                80
 05/09/2021   09:59:32   (   0.06,-127.99) (  -0.37,-126.10)  215.12                80
 05/10/2021   22:21:08   (  -0.06,-127.98) (  -0.78,-131.31)  379.43                80
 05/11/2021   22:04:51   (  -0.05,-128.01) (   0.25,-126.73)  147.15                80
 05/13/2021   10:26:19   (   0.06,-128.12) (   0.90,-131.91)  431.23                80
 05/14/2021   10:04:41   (   0.05,-128.15) (  -0.14,-127.32)   94.30                80
 05/16/2021   22:10:00   (  -0.05,-128.15) (   0.02,-127.95)   23.57                80
 05/19/2021   10:12:30   (   0.06,-128.27) (   0.14,-128.53)   30.19                80
 05/20/2021   09:50:53   (   0.06,-128.29) (  -0.89,-123.94)  494.86                80
 05/21/2021   22:12:29   (  -0.06,-128.25) (  -0.26,-129.16)  103.19                80