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)
 11/02/2021   10:43:59   (   0.02,-137.22) (  -0.43,-135.20)  229.88                80
 11/03/2021   23:02:55   (  -0.01,-137.21) (  -0.75,-140.40)  364.57                80
 11/04/2021   22:46:36   (  -0.02,-137.20) (   0.27,-135.81)  158.20                80
 11/06/2021   11:05:23   (   0.01,-137.18) (   0.86,-140.98)  432.67                80
 11/07/2021   10:49:04   (   0.02,-137.17) (  -0.16,-136.38)   89.34                80
 11/09/2021   22:51:41   (  -0.01,-137.12) (   0.02,-136.99)   14.67                80
 11/12/2021   10:51:29   (   0.01,-137.08) (   0.09,-137.57)   55.96                80
 11/13/2021   10:35:10   (   0.01,-137.06) (  -0.94,-132.98)  465.60                80
 11/14/2021   22:54:05   (  -0.00,-137.03) (  -0.28,-138.17)  131.04                80