Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2021   06:38:24   (   0.00, -75.19) (  -0.35, -73.56)  185.39                80
 12/02/2021   18:58:16   (  -0.00, -75.19) (  -0.86, -78.99)  433.63                80
 12/03/2021   18:42:33   (  -0.01, -75.19) (   0.13, -74.55)   73.21                80
 12/06/2021   06:46:32   (   0.01, -75.19) (   0.08, -75.49)   35.01                80
 12/07/2021   06:25:30   (   0.01, -75.19) (  -0.91, -71.05)  471.92                80
 12/08/2021   18:48:01   (  -0.01, -75.20) (  -0.29, -76.48)  146.33                80
 12/09/2021   18:32:18   (  -0.01, -75.21) (   0.70, -72.04)  361.28                80
 12/11/2021   06:54:40   (   0.00, -75.22) (   0.49, -77.43)  251.93                80
 12/12/2021   06:33:37   (   0.00, -75.23) (  -0.50, -72.98)  256.17                80
 12/13/2021   18:56:08   (  -0.00, -75.25) (  -0.69, -78.42)  360.50                80
 12/14/2021   18:40:26   (  -0.00, -75.27) (   0.30, -73.97)  148.10                80