Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/05/2021   10:54:18   (  -0.03,-137.22) (   0.56,-139.75)  288.96                80
 01/06/2021   10:32:42   (  -0.03,-137.22) (  -0.50,-135.17)  233.90                80
 01/07/2021   22:54:18   (   0.02,-137.22) (  -0.71,-140.38)  360.47                80
 01/08/2021   22:38:01   (   0.01,-137.22) (   0.35,-135.80)  162.34                80
 01/10/2021   10:59:30   (   0.01,-137.21) (   0.85,-140.97)  428.91                80
 01/11/2021   10:37:52   (   0.01,-137.20) (  -0.15,-136.38)   92.96                80
 01/13/2021   22:43:12   (  -0.01,-137.18) (  -0.00,-137.01)   18.76                80
 01/16/2021   10:45:44   (   0.01,-137.16) (   0.13,-137.61)   52.27                80
 01/17/2021   10:24:08   (   0.01,-137.15) (  -0.93,-133.04)  469.19                80
 01/18/2021   22:45:44   (  -0.01,-137.13) (  -0.28,-138.24)  127.43                80