Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 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)
 07/08/2021   11:04:25   (   0.03,-137.18) (   0.90,-141.02)  437.84                80
 07/09/2021   10:42:47   (   0.03,-137.18) (  -0.15,-136.44)   85.13                80
 07/11/2021   22:45:26   (  -0.02,-137.17) (   0.02,-137.06)   13.52                80
 07/14/2021   10:50:35   (   0.03,-137.16) (   0.12,-137.64)   54.35                80
 07/15/2021   10:28:56   (   0.03,-137.16) (  -0.87,-133.04)  468.03                80
 07/16/2021   22:53:13   (  -0.03,-137.14) (  -0.29,-138.26)  127.50                80
 07/17/2021   22:31:35   (  -0.02,-137.13) (   0.76,-133.67)  394.36                80
 07/19/2021   10:55:42   (   0.02,-137.11) (   0.39,-138.85)  197.67                80
 07/20/2021   10:34:04   (   0.01,-137.09) (  -0.61,-134.25)  323.44                80
 07/21/2021   22:58:20   (   0.01,-137.06) (  -0.54,-139.47)  274.11                80