Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/03/2021   10:59:17   (   0.03,-137.18) (   0.60,-139.83)  301.44                80
 07/04/2021   10:37:39   (   0.03,-137.17) (  -0.39,-135.23)  220.86                80
 07/05/2021   23:01:56   (  -0.02,-137.16) (  -0.73,-140.45)  374.45                80
 07/06/2021   22:40:18   (  -0.02,-137.15) (   0.26,-135.85)  147.37                80
 07/08/2021   11:04:25   (   0.01,-137.12) (   0.88,-141.03)  444.85                80
 07/09/2021   10:42:47   (   0.00,-137.11) (  -0.17,-136.44)   76.39                80
 07/11/2021   22:48:05   (   0.01,-137.07) (  -0.01,-137.06)    2.47                80
 07/14/2021   10:50:35   (  -0.01,-137.01) (   0.10,-137.65)   72.04                80
 07/15/2021   10:28:57   (  -0.01,-136.99) (  -0.89,-133.05)  448.69                80
 07/16/2021   22:50:33   (   0.01,-136.95) (  -0.27,-138.26)  149.01                80