Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 27.  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   (   0.03,-137.20) (   0.09,-137.39)   21.53                80
 12/30/2019   22:42:46   (  -0.03,-137.21) (  -0.23,-138.05)   95.79                80
 12/31/2019   22:21:10   (  -0.02,-137.21) (   0.80,-133.47)  425.81                80
 01/02/2020   10:45:21   (   0.03,-137.22) (   0.36,-138.67)  166.36                80
 01/03/2020   10:23:46   (   0.02,-137.22) (  -0.67,-134.10)  354.97                80
 01/04/2020   22:48:05   (  -0.03,-137.21) (  -0.51,-139.33)  242.04                80
 01/05/2020   22:26:30   (  -0.03,-137.20) (   0.52,-134.76)  278.87                80
 01/07/2020   10:50:41   (   0.04,-137.20) (   0.63,-139.96)  314.48                80
 01/08/2020   10:29:05   (   0.03,-137.19) (  -0.34,-135.37)  205.91                80
 01/09/2020   22:53:24   (  -0.05,-137.16) (  -0.83,-140.61)  392.80                80