Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/17/2021   11:02:51   (   0.02,-137.20) (   0.86,-140.79)  410.26                80
 06/18/2021   10:41:13   (   0.02,-137.20) (  -0.19,-136.21)  112.49                80
 06/19/2021   23:05:30   (  -0.02,-137.19) (  -1.00,-141.42)  482.95                80
 06/20/2021   22:43:52   (  -0.01,-137.18) (   0.05,-136.83)   39.32                80
 06/23/2021   10:49:02   (   0.00,-137.16) (   0.05,-137.42)   30.03                80
 06/24/2021   10:27:24   (  -0.01,-137.14) (  -1.00,-132.84)  491.36                80
 06/25/2021   22:49:01   (   0.01,-137.11) (  -0.19,-138.04)  106.03                80
 06/26/2021   22:32:42   (   0.01,-137.09) (   0.80,-133.45)  415.26                80
 06/28/2021   10:51:30   (  -0.01,-137.07) (   0.34,-138.62)  176.66                80
 06/29/2021   10:35:12   (  -0.01,-137.06) (  -0.71,-134.04)  344.58                80