Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2021   18:26:59   (   0.14, -75.21) (   0.98, -71.47)  426.31                80
 09/12/2021   06:48:26   (  -0.14, -75.21) (   0.18, -76.64)  162.93                80
 09/13/2021   06:26:48   (  -0.14, -75.21) (  -0.82, -72.04)  360.63                80
 09/14/2021   18:48:23   (   0.14, -75.22) (  -0.34, -77.25)  232.18                80
 09/15/2021   18:32:06   (   0.15, -75.23) (   0.73, -72.67)  291.71                80
 09/17/2021   06:53:33   (  -0.15, -75.24) (   0.43, -77.84)  296.53                80
 09/18/2021   06:31:56   (  -0.15, -75.25) (  -0.63, -73.26)  227.79                80
 09/19/2021   18:56:10   (   0.15, -75.27) (  -0.59, -78.45)  363.59                80
 09/20/2021   18:37:12   (   0.15, -75.29) (   0.47, -73.87)  161.52                80
 09/22/2021   06:58:40   (  -0.15, -75.32) (   0.68, -79.05)  424.58                80
 09/23/2021   06:37:01   (  -0.15, -75.34) (  -0.33, -74.45)  100.82                80