Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 6 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/09/2021   06:48:22   (  -0.03, -75.23) (   0.57, -77.94)  308.80                80
 06/10/2021   06:32:04   (  -0.03, -75.23) (  -0.48, -73.36)  214.61                80
 06/11/2021   18:51:01   (   0.03, -75.24) (  -0.71, -78.57)  378.47                80
 06/12/2021   18:34:43   (   0.03, -75.25) (   0.33, -73.98)  145.20                80
 06/14/2021   06:53:30   (  -0.03, -75.25) (   0.87, -79.14)  444.38                80
 06/15/2021   06:37:12   (  -0.03, -75.26) (  -0.17, -74.56)   79.59                80
 06/17/2021   18:39:51   (   0.03, -75.29) (   0.03, -75.18)   12.05                80
 06/20/2021   06:39:41   (  -0.03, -75.31) (   0.07, -75.77)   52.21                80
 06/21/2021   06:23:23   (  -0.03, -75.33) (  -0.97, -71.19)  472.35                80
 06/22/2021   18:42:20   (   0.04, -75.35) (  -0.21, -76.39)  119.29                80