Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/13/2021   22:33:37   (  -0.04,-137.18) (   0.88,-133.09)  467.16                80
 09/15/2021   10:52:25   (   0.04,-137.18) (   0.28,-138.26)  123.58                80
 09/16/2021   10:36:06   (   0.03,-137.17) (  -0.73,-133.66)  398.45                80
 09/17/2021   22:55:01   (  -0.02,-137.14) (  -0.44,-138.87)  197.92                80
 09/18/2021   22:38:44   (  -0.02,-137.13) (   0.63,-134.29)  324.12                80
 09/20/2021   10:57:31   (   0.01,-137.12) (   0.52,-139.46)  266.83                80
 09/21/2021   10:41:13   (   0.01,-137.11) (  -0.49,-134.87)  255.20                80
 09/22/2021   23:00:08   (  -0.01,-137.08) (  -0.68,-140.07)  341.32                80
 09/23/2021   22:43:50   (  -0.02,-137.06) (   0.33,-135.48)  180.43                80
 09/25/2021   11:02:37   (   0.01,-137.05) (   0.82,-140.65)  411.25                80
 09/26/2021   10:46:18   (   0.01,-137.03) (  -0.19,-136.06)  109.97                80