Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/01/2021   22:36:22   (  -0.03,-137.18) (   0.53,-134.65)  289.01                 8
 07/03/2021   10:59:17   (   0.03,-137.18) (   0.60,-139.83)  301.13                80
 07/04/2021   10:37:39   (   0.02,-137.17) (  -0.39,-135.23)  221.18                80
 07/05/2021   22:59:16   (  -0.02,-137.16) (  -0.74,-140.45)  374.68                80
 07/06/2021   22:42:58   (  -0.01,-137.15) (   0.26,-135.85)  147.16                80
 07/08/2021   11:04:25   (  -0.00,-137.13) (   0.88,-141.03)  444.58                80
 07/09/2021   10:42:47   (  -0.01,-137.11) (  -0.17,-136.44)   76.68                80
 07/11/2021   22:48:05   (   0.01,-137.07) (  -0.01,-137.06)    2.68                80
 07/14/2021   10:50:35   (  -0.01,-137.02) (   0.10,-137.65)   71.37                80
 07/15/2021   10:28:57   (  -0.01,-136.99) (  -0.89,-133.05)  449.34                80