Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2021   18:37:27   (   0.03, -75.17) (  -0.05, -75.64)   52.98                80
 04/21/2021   18:21:10   (   0.03, -75.17) (   0.98, -71.06)  469.86                80
 04/23/2021   06:42:38   (  -0.02, -75.18) (   0.19, -76.23)  119.47                80
 04/24/2021   06:21:01   (  -0.02, -75.18) (  -0.84, -71.65)  403.46                80
 04/25/2021   18:42:36   (   0.02, -75.17) (  -0.37, -76.85)  191.18                80
 04/26/2021   18:26:18   (   0.02, -75.18) (   0.66, -72.26)  332.13                80
 04/28/2021   06:47:47   (  -0.02, -75.20) (   0.51, -77.44)  256.27                80
 04/29/2021   06:26:09   (  -0.02, -75.20) (  -0.52, -72.85)  266.98                80
 04/30/2021   18:47:45   (   0.02, -75.19) (  -0.62, -78.07)  327.47                80
 05/01/2021   18:31:28   (   0.02, -75.20) (   0.41, -73.48)  196.24                80
 05/03/2021   06:52:56   (  -0.01, -75.23) (   0.75, -78.66)  391.06                80