Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/18/2021   22:29:39   (   0.05,-137.21) (   0.89,-133.38)  435.42                80
 03/20/2021   10:51:07   (  -0.04,-137.20) (   0.26,-138.57)  155.75                80
 03/21/2021   10:29:29   (  -0.04,-137.19) (  -0.76,-133.98)  366.16                80
 03/22/2021   22:51:06   (   0.03,-137.17) (  -0.44,-139.18)  229.90                80
 03/23/2021   22:34:48   (   0.03,-137.16) (   0.58,-134.60)  291.72                80
 03/25/2021   10:56:16   (  -0.02,-137.14) (   0.58,-139.78)  300.66                80
 03/26/2021   10:34:39   (  -0.02,-137.12) (  -0.44,-135.19)  220.50                80
 03/27/2021   22:56:15   (   0.01,-137.10) (  -0.75,-140.40)  376.68                80
 03/28/2021   22:39:58   (   0.01,-137.08) (   0.28,-135.81)  144.18                80
 03/30/2021   11:01:26   (  -0.01,-137.05) (   0.89,-140.99)  449.45                80
 03/31/2021   10:39:50   (  -0.02,-137.03) (  -0.18,-136.41)   70.86                80