Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 28.  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) (   0.06,-137.39)   21.87                80
 12/29/2019   10:18:27   (   0.02,-137.20) (  -0.97,-132.82)  499.65                80
 12/30/2019   22:42:46   (  -0.03,-137.20) (  -0.20,-138.05)   97.14                80
 12/31/2019   22:21:11   (  -0.02,-137.20) (   0.83,-133.48)  424.17                80
 01/02/2020   10:45:22   (   0.03,-137.20) (   0.34,-138.68)  168.31                80
 01/03/2020   10:23:46   (   0.02,-137.19) (  -0.69,-134.10)  352.75                80
 01/04/2020   22:48:05   (  -0.03,-137.18) (  -0.54,-139.33)  244.88                80
 01/05/2020   22:26:29   (  -0.03,-137.18) (   0.49,-134.75)  275.76                80
 01/07/2020   10:50:41   (   0.04,-137.16) (   0.67,-139.95)  317.91                80
 01/08/2020   10:29:05   (   0.04,-137.15) (  -0.36,-135.38)  202.15                80
 01/09/2020   22:53:24   (  -0.05,-137.12) (  -0.82,-140.61)  397.14                80
 01/10/2020   22:31:49   (  -0.05,-137.11) (   0.21,-136.04)  122.33                80