Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2019   10:53:38   (   0.02,-137.21) (   0.80,-140.69)  396.31                80
 12/23/2019   10:32:03   (   0.02,-137.20) (  -0.22,-136.11)  124.50                80
 12/24/2019   22:56:22   (  -0.03,-137.19) (  -0.94,-141.35)  472.88                80
 12/25/2019   22:34:46   (  -0.02,-137.18) (   0.09,-136.77)   47.58                80
 12/28/2019   10:40:02   (   0.02,-137.16) (   0.06,-137.40)   27.06                80
 12/29/2019   10:18:27   (   0.02,-137.14) (  -0.97,-132.82)  493.01                80
 12/30/2019   22:42:45   (  -0.03,-137.12) (  -0.25,-138.04)  105.39                80
 12/31/2019   22:21:10   (  -0.02,-137.11) (   0.78,-133.47)  414.49                80
 01/02/2020   10:45:21   (   0.03,-137.09) (   0.39,-138.67)  180.75                80
 01/03/2020   10:23:45   (   0.02,-137.07) (  -0.64,-134.10)  338.79                80