Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/29/2019   10:18:26   (   0.02,-137.20) (  -0.94,-132.81)  499.60                80
 12/30/2019   22:42:46   (  -0.03,-137.20) (  -0.23,-138.05)   97.37                80
 12/31/2019   22:21:10   (  -0.02,-137.19) (   0.80,-133.47)  423.88                80
 01/02/2020   10:45:22   (   0.03,-137.20) (   0.37,-138.67)  168.68                80
 01/03/2020   10:23:46   (   0.02,-137.19) (  -0.66,-134.10)  352.30                80
 01/04/2020   22:48:05   (  -0.03,-137.18) (  -0.52,-139.33)  245.53                80
 01/05/2020   22:26:30   (  -0.03,-137.17) (   0.51,-134.76)  275.03                80
 01/07/2020   10:50:41   (   0.04,-137.16) (   0.65,-139.96)  318.73                80
 01/08/2020   10:29:06   (   0.03,-137.14) (  -0.37,-135.38)  201.27                80
 01/09/2020   22:53:25   (  -0.05,-137.12) (  -0.81,-140.61)  398.28                80
 01/10/2020   22:31:50   (  -0.04,-137.10) (   0.22,-136.04)  121.15                80