Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2020   10:44:33   (  -0.01,-137.23) (   0.21,-138.17)  107.23                80
 12/11/2020   10:28:17   (  -0.01,-137.23) (  -0.83,-133.59)  415.29                80
 12/12/2020   22:47:13   (   0.01,-137.22) (  -0.37,-138.79)  180.18                80
 12/13/2020   22:30:57   (   0.00,-137.21) (   0.68,-134.22)  341.92                80
 12/15/2020   10:49:46   (   0.00,-137.21) (   0.49,-139.40)  250.21                80
 12/16/2020   10:33:28   (   0.01,-137.20) (  -0.50,-134.81)  271.41                80
 12/17/2020   22:52:26   (  -0.01,-137.18) (  -0.64,-140.03)  325.24                80
 12/18/2020   22:36:08   (  -0.01,-137.17) (   0.36,-135.44)  196.23                80
 12/20/2020   10:54:58   (   0.01,-137.16) (   0.81,-140.63)  396.44                80
 12/21/2020   10:38:41   (   0.01,-137.14) (  -0.24,-136.05)  124.84                80
 12/22/2020   22:57:37   (  -0.00,-137.12) (  -0.95,-141.26)  472.27                80
 12/23/2020   22:41:21   (  -0.00,-137.11) (   0.11,-136.68)   48.84                80