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)  119.84                80
 09/16/2021   10:36:07   (   0.04,-137.21) (  -0.78,-133.67)  403.39                80
 09/17/2021   22:55:02   (  -0.03,-137.20) (  -0.39,-138.88)  191.47                80
 09/18/2021   22:38:44   (  -0.02,-137.20) (   0.62,-134.28)  331.74                80
 09/20/2021   10:57:31   (   0.02,-137.21) (   0.53,-139.46)  257.06                80
 09/21/2021   10:41:13   (   0.02,-137.21) (  -0.48,-134.86)  266.17                80
 09/22/2021   23:00:08   (  -0.02,-137.19) (  -0.69,-140.07)  328.90                80
 09/23/2021   22:43:50   (  -0.02,-137.19) (   0.38,-135.49)  194.04                80
 09/25/2021   11:02:37   (   0.02,-137.19) (   0.83,-140.65)  395.56                80
 09/26/2021   10:46:19   (   0.02,-137.18) (  -0.24,-136.07)  126.87                80
 09/27/2021   23:05:15   (  -0.02,-137.15) (  -0.93,-141.27)  469.68                80