Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2019   22:34:47   (  -0.02,-137.19) (   0.10,-136.77)   48.20                80
 12/28/2019   10:40:03   (   0.02,-137.16) (   0.05,-137.40)   26.37                80
 12/29/2019   10:18:27   (   0.02,-137.15) (  -0.98,-132.82)  494.00                80
 12/30/2019   22:42:45   (  -0.02,-137.14) (  -0.25,-138.04)  104.08                80
 12/31/2019   22:21:10   (  -0.02,-137.12) (   0.78,-133.47)  415.94                80
 01/02/2020   10:45:21   (   0.02,-137.10) (   0.38,-138.67)  179.24                80
 01/03/2020   10:23:46   (   0.02,-137.08) (  -0.65,-134.10)  340.48                80
 01/04/2020   22:48:05   (  -0.03,-137.06) (  -0.52,-139.33)  258.43                80
 01/05/2020   22:26:30   (  -0.02,-137.04) (   0.50,-134.76)  260.91                80
 01/07/2020   10:50:40   (   0.04,-137.01) (   0.71,-139.94)  335.42                80