Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 7.  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,-137.20) (   0.11,-137.62)   47.66                80
 12/10/2021   10:36:46   (  -0.00,-137.21) (  -0.94,-133.18)  459.38                80
 12/11/2021   22:56:37   (   0.01,-137.20) (  -0.33,-138.60)  160.52                80
 12/12/2021   22:40:54   (   0.01,-137.20) (   0.67,-134.16)  346.40                80
 12/14/2021   11:00:35   (  -0.01,-137.21) (   0.53,-139.55)  267.72                80
 12/15/2021   10:44:53   (  -0.00,-137.20) (  -0.46,-135.10)  238.84                80
 12/16/2021   23:04:44   (  -0.00,-137.19) (  -0.74,-140.54)  381.93                80
 12/17/2021   22:49:02   (  -0.01,-137.18) (   0.26,-136.09)  124.16                80
 12/19/2021   11:08:42   (   0.01,-137.17) (   1.00,-141.47)  491.41                80
 12/20/2021   10:53:01   (   0.00,-137.16) (  -0.05,-137.04)   14.31                80