Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2020   22:47:13   (   0.01,-137.22) (  -0.36,-138.80)  179.77                80
 12/13/2020   22:30:57   (   0.00,-137.22) (   0.69,-134.22)  342.43                80
 12/15/2020   10:49:46   (   0.00,-137.21) (   0.48,-139.40)  249.58                80
 12/16/2020   10:33:29   (   0.01,-137.20) (  -0.52,-134.81)  272.16                80
 12/17/2020   22:52:26   (  -0.01,-137.19) (  -0.63,-140.04)  324.20                80
 12/18/2020   22:36:09   (  -0.01,-137.18) (   0.37,-135.44)  197.38                80
 12/20/2020   10:54:58   (   0.00,-137.17) (   0.80,-140.63)  395.22                80
 12/21/2020   10:38:41   (   0.00,-137.16) (  -0.25,-136.05)  126.19                80
 12/22/2020   22:57:38   (  -0.00,-137.14) (  -0.95,-141.26)  470.61                80
 12/23/2020   22:41:21   (  -0.00,-137.12) (   0.11,-136.68)   50.60                80