Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2021   18:56:09   (   0.02, -75.21) (  -0.68, -78.42)  365.13                80
 12/14/2021   18:40:26   (   0.01, -75.22) (   0.32, -73.97)  143.08                80
 12/16/2021   07:02:47   (  -0.01, -75.24) (   0.94, -79.36)  469.63                80
 12/17/2021   06:41:44   (  -0.01, -75.25) (  -0.06, -74.91)   38.73                80
 12/19/2021   18:45:53   (  -0.00, -75.29) (  -0.14, -75.90)   69.71                80
 12/20/2021   18:30:11   (  -0.01, -75.30) (   0.86, -71.45)  438.93                80
 12/22/2021   06:52:32   (   0.01, -75.33) (   0.34, -76.85)  172.87                80
 12/23/2021   06:31:29   (   0.01, -75.34) (  -0.65, -72.40)  335.89                80
 12/24/2021   18:54:00   (  -0.01, -75.37) (  -0.58, -77.82)  280.05                80
 12/25/2021   18:38:17   (  -0.01, -75.40) (   0.42, -73.38)  229.28                80