Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/04/2021   10:52:07   (   0.03,-137.20) (   0.18,-137.86)   74.96                80
 08/05/2021   10:30:29   (   0.02,-137.19) (  -0.88,-133.27)  447.37                80
 08/06/2021   22:52:04   (  -0.02,-137.19) (  -0.30,-138.48)  147.28                80
 08/07/2021   22:35:47   (   0.02,-137.18) (   0.76,-133.90)  374.03                80
 08/09/2021   10:54:34   (  -0.01,-137.16) (   0.42,-139.07)  218.06                80
 08/10/2021   10:38:16   (  -0.01,-137.14) (  -0.58,-134.47)  303.88                80
 08/11/2021   22:57:11   (   0.00,-137.12) (  -0.59,-139.68)  291.52                80
 08/12/2021   22:40:54   (   0.00,-137.11) (   0.47,-135.09)  230.15                80
 08/14/2021   10:59:41   (  -0.00,-137.08) (   0.71,-140.26)  363.12                80
 08/15/2021   10:43:22   (  -0.00,-137.06) (  -0.29,-135.67)  157.81                80