Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 6 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/12/2021   18:34:43   (   0.03, -75.25) (   0.32, -73.98)  145.14                80
 06/14/2021   06:53:30   (  -0.03, -75.25) (   0.83, -79.15)  444.71                80
 06/15/2021   06:37:12   (  -0.03, -75.25) (  -0.16, -74.55)   79.20                80
 06/17/2021   18:39:52   (   0.03, -75.28) (   0.07, -75.19)   11.47                80
 06/20/2021   06:39:40   (  -0.04, -75.30) (   0.08, -75.77)   53.11                80
 06/21/2021   06:23:23   (  -0.03, -75.32) (  -0.96, -71.18)  471.37                80
 06/22/2021   18:42:20   (   0.05, -75.34) (  -0.16, -76.40)  120.24                80
 06/23/2021   18:26:02   (   0.04, -75.36) (   0.82, -71.80)  404.41                80
 06/25/2021   06:44:49   (  -0.05, -75.37) (   0.32, -76.98)  183.87                80