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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/09/2021   10:57:13   (   0.04,-137.20) (   0.48,-139.05)  211.53                80
 08/10/2021   10:35:36   (   0.04,-137.20) (  -0.58,-134.47)  311.59                80
 08/11/2021   22:57:11   (  -0.04,-137.20) (  -0.59,-139.67)  281.94                80
 08/12/2021   22:40:53   (  -0.04,-137.20) (   0.41,-135.08)  240.94                80
 08/14/2021   11:02:21   (   0.04,-137.18) (   0.71,-140.26)  350.33                80
 08/15/2021   10:40:42   (   0.04,-137.18) (  -0.29,-135.66)  171.91                80
 08/16/2021   23:02:18   (  -0.03,-137.16) (  -0.87,-140.87)  423.30                80
 08/17/2021   22:46:00   (  -0.03,-137.15) (   0.19,-136.29)   98.38                80
 08/19/2021   11:04:48   (   0.01,-137.12) (   1.00,-141.46)  494.93                80
 08/20/2021   10:48:30   (  -0.01,-137.10) (  -0.06,-136.88)   26.05                80