Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 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)
 12/09/2021   10:52:28   (  -0.01,-137.21) (   0.07,-137.63)   47.16                80
 12/10/2021   10:36:46   (  -0.01,-137.21) (  -0.92,-133.18)  460.02                80
 12/11/2021   22:56:37   (   0.01,-137.21) (  -0.28,-138.61)  159.62                80
 12/12/2021   22:40:55   (   0.01,-137.21) (   0.71,-134.17)  347.52                80
 12/14/2021   11:00:35   (  -0.01,-137.22) (   0.54,-139.55)  266.28                80
 12/15/2021   10:44:53   (  -0.01,-137.22) (  -0.46,-135.10)  240.51                80
 12/16/2021   23:04:44   (   0.00,-137.20) (  -0.74,-140.54)  380.00                80
 12/17/2021   22:49:02   (  -0.00,-137.20) (   0.26,-136.09)  126.34                80
 12/19/2021   11:08:42   (   0.00,-137.19) (   0.99,-141.47)  488.79                80
 12/20/2021   10:52:59   (   0.01,-137.18) (  -0.00,-137.03)   17.20                80
 12/22/2021   22:54:28   (  -0.01,-137.14) (  -0.18,-138.02)   99.58                80