Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 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)
 03/06/2021   22:54:32   (   0.05,-137.22) (  -0.63,-140.11)  330.75                80
 03/07/2021   22:38:15   (   0.04,-137.21) (   0.44,-135.54)  191.61                80
 03/09/2021   10:59:43   (  -0.03,-137.20) (   0.76,-140.71)  400.37                80
 03/10/2021   10:38:05   (  -0.03,-137.19) (  -0.26,-136.12)  121.71                80
 03/11/2021   22:59:43   (   0.02,-137.18) (  -0.91,-141.34)  473.06                80
 03/12/2021   22:43:25   (   0.02,-137.18) (   0.11,-136.75)   48.98                80
 03/15/2021   10:45:56   (  -0.02,-137.15) (   0.02,-137.34)   21.71                80
 03/16/2021   10:24:18   (  -0.02,-137.14) (  -0.99,-132.75)  499.75                80
 03/17/2021   22:45:56   (   0.02,-137.12) (  -0.16,-137.97)   96.13                80
 03/18/2021   22:29:38   (   0.02,-137.11) (   0.86,-133.38)  425.07                80