Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 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)
 04/10/2021   18:29:48   (   0.03, -75.20) (   0.49, -73.21)  226.74                80
 04/12/2021   06:51:16   (  -0.03, -75.21) (   0.68, -78.39)  362.59                80
 04/13/2021   06:29:38   (  -0.03, -75.22) (  -0.34, -73.80)  160.82                80
 04/14/2021   18:51:15   (   0.03, -75.22) (  -0.81, -79.02)  432.15                80
 04/15/2021   18:34:57   (   0.03, -75.23) (   0.22, -74.43)   91.72                80
 04/17/2021   06:56:26   (  -0.03, -75.25) (   0.95, -79.61)  496.64                80
 04/18/2021   06:34:48   (  -0.03, -75.26) (  -0.07, -75.02)   27.17                80
 04/20/2021   18:37:27   (   0.02, -75.28) (  -0.04, -75.65)   41.23                80
 04/21/2021   18:21:10   (   0.02, -75.30) (   0.99, -71.06)  483.32                80
 04/23/2021   06:42:38   (  -0.01, -75.33) (   0.19, -76.24)  103.96                80