Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2021   10:52:24   (   0.04,-137.21) (   0.29,-138.26)  119.99                80
 09/16/2021   10:36:07   (   0.03,-137.21) (  -0.78,-133.68)  403.21                80
 09/17/2021   22:55:02   (  -0.02,-137.20) (  -0.38,-138.88)  191.74                80
 09/18/2021   22:38:44   (  -0.02,-137.20) (   0.63,-134.29)  331.43                80
 09/20/2021   10:57:31   (   0.01,-137.20) (   0.53,-139.46)  257.42                80
 09/21/2021   10:41:13   (   0.01,-137.20) (  -0.48,-134.87)  265.78                80
 09/22/2021   23:00:08   (  -0.01,-137.19) (  -0.68,-140.07)  329.32                80
 09/23/2021   22:43:50   (  -0.02,-137.18) (   0.39,-135.49)  193.60                80
 09/25/2021   11:02:37   (   0.01,-137.18) (   0.82,-140.65)  396.04                80
 09/26/2021   10:46:19   (   0.02,-137.17) (  -0.25,-136.07)  126.37                80
 09/27/2021   23:05:15   (  -0.01,-137.15) (  -0.91,-141.28)  470.23                80