Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/06/2021   10:32:42   (  -0.03,-137.22) (  -0.50,-135.17)  233.97                80
 01/07/2021   22:54:18   (   0.02,-137.22) (  -0.71,-140.38)  360.12                80
 01/08/2021   22:38:02   (   0.00,-137.22) (   0.35,-135.80)  162.79                80
 01/10/2021   10:59:30   (   0.01,-137.21) (   0.85,-140.97)  428.50                80
 01/11/2021   10:37:52   (   0.01,-137.21) (  -0.15,-136.38)   93.49                80
 01/13/2021   22:43:13   (  -0.01,-137.19) (   0.05,-137.03)   19.62                80
 01/16/2021   10:45:44   (   0.01,-137.17) (   0.14,-137.61)   51.38                80
 01/17/2021   10:24:08   (   0.01,-137.16) (  -0.92,-133.03)  470.26                80
 01/18/2021   22:45:45   (  -0.01,-137.14) (  -0.24,-138.25)  126.04                80
 01/19/2021   22:29:27   (  -0.01,-137.13) (   0.76,-133.66)  395.34                80