Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/02/2021   18:58:16   (   0.00, -75.19) (  -0.86, -79.00)  433.85                80
 12/03/2021   18:42:33   (  -0.00, -75.19) (   0.13, -74.55)   72.86                80
 12/06/2021   06:46:32   (   0.01, -75.18) (   0.07, -75.50)   35.84                80
 12/07/2021   06:25:30   (   0.01, -75.18) (  -0.93, -71.05)  471.01                80
 12/08/2021   18:48:01   (  -0.01, -75.19) (  -0.28, -76.49)  147.34                80
 12/09/2021   18:32:18   (  -0.01, -75.19) (   0.72, -72.04)  360.17                80
 12/11/2021   06:54:40   (   0.00, -75.20) (   0.48, -77.43)  253.43                80
 12/12/2021   06:33:37   (   0.00, -75.22) (  -0.52, -72.99)  254.59                80
 12/13/2021   18:56:08   (  -0.00, -75.24) (  -0.74, -78.41)  362.14                80
 12/14/2021   18:40:25   (  -0.00, -75.25) (   0.26, -73.96)  146.38                80