Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 11 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/01/2021   11:00:18   (   0.01,-137.22) (   0.59,-139.79)  293.35                80
 11/02/2021   10:44:00   (   0.02,-137.21) (  -0.43,-135.20)  229.77                80
 11/03/2021   23:02:55   (  -0.01,-137.20) (  -0.75,-140.40)  364.86                80
 11/04/2021   22:46:36   (  -0.02,-137.19) (   0.28,-135.81)  157.83                80
 11/06/2021   11:05:23   (   0.01,-137.18) (   0.86,-140.98)  433.06                80
 11/07/2021   10:49:04   (   0.02,-137.16) (  -0.17,-136.39)   88.88                80
 11/09/2021   22:51:41   (  -0.01,-137.12) (   0.03,-137.00)   14.01                80
 11/12/2021   10:51:28   (   0.01,-137.07) (   0.14,-137.56)   56.75                80
 11/13/2021   10:35:09   (   0.01,-137.05) (  -0.89,-132.97)  464.71                80
 11/14/2021   22:54:05   (  -0.00,-137.02) (  -0.26,-138.17)  132.12                80