Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2021   06:43:52   (   0.00, -75.18) (   0.08, -75.49)   36.24                80
 12/07/2021   06:28:09   (   0.01, -75.18) (  -0.91, -71.05)  470.59                80
 12/08/2021   18:48:01   (  -0.00, -75.18) (  -0.30, -76.48)  147.98                80
 12/09/2021   18:32:18   (  -0.00, -75.19) (   0.70, -72.03)  359.47                80
 12/11/2021   06:54:40   (  -0.00, -75.20) (   0.49, -77.43)  254.14                80
 12/12/2021   06:33:37   (   0.00, -75.21) (  -0.50, -72.98)  253.83                80
 12/13/2021   18:56:08   (   0.00, -75.23) (  -0.70, -78.42)  363.09                80
 12/14/2021   18:40:26   (  -0.00, -75.24) (   0.30, -73.97)  145.40                80
 12/16/2021   07:02:46   (   0.00, -75.27) (   0.95, -79.35)  466.80                80
 12/17/2021   06:41:45   (   0.01, -75.28) (  -0.10, -74.92)   41.84                80