Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2021   18:42:36   (   0.03, -75.18) (  -0.36, -76.85)  190.61                80
 04/26/2021   18:26:18   (   0.03, -75.18) (   0.67, -72.26)  332.79                80
 04/28/2021   06:47:47   (  -0.03, -75.20) (   0.49, -77.44)  255.91                80
 04/29/2021   06:26:09   (  -0.03, -75.20) (  -0.54, -72.85)  267.38                80
 04/30/2021   18:47:46   (   0.02, -75.20) (  -0.60, -78.07)  326.45                80
 05/01/2021   18:31:28   (   0.02, -75.21) (   0.43, -73.48)  197.37                80
 05/03/2021   06:52:56   (  -0.02, -75.23) (   0.73, -78.66)  390.17                80
 05/04/2021   06:31:19   (  -0.02, -75.24) (  -0.31, -74.08)  133.99                80
 05/05/2021   18:52:54   (   0.01, -75.25) (  -0.89, -79.28)  458.68                80
 05/06/2021   18:36:37   (   0.01, -75.27) (   0.15, -74.69)   66.23                80