Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/03/2021   18:42:33   (  -0.00, -75.19) (   0.14, -74.55)   72.64                80
 12/06/2021   06:46:32   (   0.01, -75.18) (   0.06, -75.50)   36.07                80
 12/07/2021   06:25:30   (   0.01, -75.18) (  -0.94, -71.05)  470.81                80
 12/08/2021   18:48:00   (  -0.01, -75.18) (  -0.33, -76.47)  147.71                80
 12/09/2021   18:32:19   (  -0.01, -75.19) (   0.73, -72.04)  359.80                80
 12/11/2021   06:54:39   (   0.00, -75.20) (   0.52, -77.42)  253.73                80
 12/12/2021   06:33:36   (   0.00, -75.21) (  -0.48, -72.98)  254.25                80
 12/13/2021   18:56:08   (  -0.00, -75.23) (  -0.72, -78.41)  362.61                80
 12/14/2021   18:40:25   (  -0.00, -75.25) (   0.28, -73.97)  145.86                80
 12/16/2021   07:02:46   (   0.00, -75.27) (   0.91, -79.36)  466.28                80