Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2020   10:28:17   (  -0.01,-137.23) (  -0.84,-133.59)  415.45                80
 12/12/2020   22:47:13   (   0.01,-137.22) (  -0.37,-138.80)  179.84                80
 12/13/2020   22:30:57   (   0.00,-137.22) (   0.68,-134.22)  342.34                80
 12/15/2020   10:49:46   (   0.00,-137.21) (   0.48,-139.40)  249.64                80
 12/16/2020   10:33:29   (   0.01,-137.20) (  -0.51,-134.81)  272.08                80
 12/17/2020   22:52:26   (  -0.01,-137.19) (  -0.64,-140.03)  324.38                80
 12/18/2020   22:36:08   (  -0.01,-137.18) (   0.36,-135.44)  197.18                80
 12/20/2020   10:54:58   (   0.00,-137.17) (   0.81,-140.63)  395.39                80
 12/21/2020   10:38:41   (   0.01,-137.16) (  -0.24,-136.05)  126.00                80
 12/22/2020   22:57:38   (  -0.00,-137.13) (  -0.95,-141.26)  470.92                80
 12/23/2020   22:41:21   (  -0.00,-137.12) (   0.10,-136.68)   50.26                80