Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/23/2021   10:49:02   (   0.01,-137.21) (   0.05,-137.42)   23.70                80
 06/24/2021   10:27:24   (   0.01,-137.21) (  -0.99,-132.83)  499.34                80
 06/25/2021   22:51:40   (  -0.00,-137.20) (  -0.20,-138.04)   95.78                80
 06/26/2021   22:30:03   (   0.00,-137.20) (   0.85,-133.45)  427.19                80
 06/28/2021   10:54:09   (   0.00,-137.21) (   0.34,-138.62)  161.52                80
 06/29/2021   10:32:32   (   0.00,-137.20) (  -0.70,-134.03)  361.42                80
 06/30/2021   22:56:48   (  -0.01,-137.19) (  -0.48,-139.24)  233.92                80
 07/01/2021   22:37:51   (  -0.01,-137.19) (   0.57,-134.65)  288.94                80
 07/03/2021   10:59:18   (   0.00,-137.19) (   0.57,-139.83)  300.27                80
 07/04/2021   10:37:39   (  -0.00,-137.19) (  -0.42,-135.23)  222.07                80
 07/05/2021   22:59:16   (   0.01,-137.16) (  -0.76,-140.44)  374.59                80