Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/11/2021   22:45:25   (  -0.03,-137.17) (  -0.02,-137.05)   13.41                80
 07/14/2021   10:50:35   (   0.03,-137.16) (   0.12,-137.64)   54.65                80
 07/15/2021   10:28:57   (   0.03,-137.15) (  -0.87,-133.05)  467.70                80
 07/16/2021   22:53:13   (  -0.03,-137.14) (  -0.29,-138.26)  128.03                80
 07/17/2021   22:31:35   (  -0.03,-137.12) (   0.76,-133.67)  393.75                80
 07/19/2021   10:55:43   (   0.02,-137.10) (   0.40,-138.85)  198.31                80
 07/20/2021   10:34:05   (   0.01,-137.09) (  -0.65,-134.26)  322.73                80
 07/21/2021   22:58:20   (   0.01,-137.05) (  -0.56,-139.46)  275.09                80
 07/22/2021   22:39:23   (   0.01,-137.03) (   0.49,-134.88)  245.55                80