Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2021   10:59:43   (  -0.04,-137.21) (   0.74,-140.71)  398.83                80
 03/10/2021   10:38:05   (  -0.04,-137.21) (  -0.27,-136.12)  124.07                80
 03/11/2021   22:59:43   (   0.03,-137.22) (  -0.89,-141.34)  469.39                80
 03/12/2021   22:43:25   (   0.03,-137.22) (   0.13,-136.75)   53.49                80
 03/15/2021   10:45:56   (  -0.03,-137.21) (  -0.01,-137.34)   15.17                80
 03/17/2021   22:45:56   (   0.03,-137.20) (  -0.12,-137.98)   87.34                80
 03/18/2021   22:29:38   (   0.03,-137.20) (   0.90,-133.39)  434.70                80
 03/20/2021   10:51:06   (  -0.03,-137.18) (   0.31,-138.56)  157.99                80
 03/21/2021   10:29:28   (  -0.02,-137.16) (  -0.71,-133.97)  363.48                80
 03/22/2021   22:51:06   (   0.02,-137.15) (  -0.42,-139.19)  232.47                80