Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2019   10:40:02   (   0.02,-137.16) (   0.06,-137.39)   26.27                80
 12/29/2019   10:18:27   (   0.02,-137.15) (  -0.96,-132.82)  493.89                80
 12/30/2019   22:42:46   (  -0.02,-137.13) (  -0.20,-138.05)  104.33                80
 12/31/2019   22:21:11   (  -0.02,-137.12) (   0.82,-133.48)  415.66                80
 01/02/2020   10:45:21   (   0.03,-137.10) (   0.40,-138.67)  179.54                80
 01/03/2020   10:23:45   (   0.02,-137.08) (  -0.63,-134.09)  340.16                80
 01/04/2020   22:48:05   (  -0.03,-137.05) (  -0.54,-139.33)  258.87                80
 01/05/2020   22:26:29   (  -0.03,-137.03) (   0.49,-134.75)  260.42                80
 01/07/2020   10:50:39   (   0.04,-137.00) (   0.72,-139.94)  335.93                80
 01/08/2020   10:29:04   (   0.03,-136.97) (  -0.31,-135.37)  182.79                80