Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/29/2021   22:39:51   (  -0.00,-137.23) (   0.24,-136.12)  126.13                80
 01/31/2021   11:01:19   (  -0.00,-137.24) (   0.92,-141.30)  462.71                80
 02/01/2021   10:39:43   (  -0.00,-137.25) (  -0.15,-136.72)   60.45                80
 02/03/2021   22:42:23   (   0.00,-137.25) (  -0.03,-137.35)   12.02                80
 02/06/2021   10:47:34   (  -0.01,-137.25) (   0.12,-137.96)   79.88                80
 02/07/2021   10:25:57   (  -0.01,-137.24) (  -0.89,-133.37)  442.07                80
 02/08/2021   22:47:34   (   0.02,-137.22) (  -0.29,-138.58)  155.00                80
 02/09/2021   22:31:18   (   0.02,-137.22) (   0.77,-134.00)  366.74                80
 02/11/2021   10:52:45   (  -0.03,-137.21) (   0.44,-139.17)  224.35                80