Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2021   22:40:55   (   0.02,-137.21) (   0.70,-134.16)  347.46                80
 12/14/2021   11:00:36   (  -0.02,-137.22) (   0.49,-139.56)  266.26                80
 12/15/2021   10:44:53   (  -0.01,-137.22) (  -0.50,-135.11)  240.61                80
 12/16/2021   23:04:44   (   0.01,-137.21) (  -0.75,-140.53)  379.74                80
 12/17/2021   22:49:01   (   0.00,-137.20) (   0.24,-136.09)  126.71                80
 12/19/2021   11:08:43   (  -0.00,-137.20) (   0.96,-141.48)  488.25                80
 12/20/2021   10:53:00   (   0.00,-137.19) (  -0.04,-137.03)   17.66                80
 12/22/2021   22:54:28   (  -0.01,-137.15) (  -0.21,-138.01)   98.59                80
 12/23/2021   22:38:46   (  -0.01,-137.13) (   0.79,-133.57)  406.81                80
 12/25/2021   10:58:27   (   0.01,-137.12) (   0.41,-138.96)  209.56                80