Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 11 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 11/13/2021   10:35:10   (   0.01,-137.21) (  -0.93,-132.97)  483.51                80
 11/14/2021   22:54:05   (  -0.01,-137.21) (  -0.24,-138.17)  109.88                80
 11/15/2021   22:37:47   (  -0.01,-137.22) (   0.79,-133.58)  414.27                80
 11/17/2021   10:56:33   (   0.01,-137.23) (   0.35,-138.75)  173.44                80
 11/18/2021   10:40:15   (   0.01,-137.23) (  -0.69,-134.16)  350.28                80
 11/19/2021   22:59:10   (  -0.01,-137.22) (  -0.47,-139.36)  244.16                80
 11/20/2021   22:42:51   (  -0.01,-137.21) (   0.57,-134.77)  279.11                80
 11/22/2021   11:01:37   (   0.01,-137.21) (   0.64,-139.93)  310.10                80
 11/23/2021   10:45:18   (   0.01,-137.20) (  -0.40,-135.33)  212.62                80
 11/24/2021   23:04:13   (  -0.01,-137.18) (  -0.75,-140.54)  383.13                80
 11/25/2021   22:47:55   (  -0.01,-137.17) (   0.29,-135.95)  139.27                80