Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 21.  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   10:49:01   (   0.01,-137.20) (   0.08,-137.41)   24.57                80
 06/24/2021   10:27:24   (   0.00,-137.20) (  -0.97,-132.82)  498.13                80
 06/25/2021   22:51:40   (  -0.00,-137.18) (  -0.22,-138.03)   97.52                80
 06/26/2021   22:32:43   (   0.00,-137.18) (   0.83,-133.45)  425.09                80
 06/28/2021   10:54:10   (   0.00,-137.18) (   0.31,-138.62)  164.34                80
 06/29/2021   10:32:31   (  -0.00,-137.17) (  -0.68,-134.03)  358.20                80
 06/30/2021   22:54:09   (  -0.00,-137.16) (  -0.44,-139.25)  237.67                80
 07/01/2021   22:37:50   (  -0.00,-137.15) (   0.55,-134.65)  284.81                80
 07/03/2021   10:59:18   (   0.00,-137.15) (   0.59,-139.83)  305.10                80
 07/04/2021   10:37:40   (  -0.00,-137.14) (  -0.45,-135.24)  216.86                80