Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 10 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/20/2019   10:46:20   (   0.01,-137.20) (   0.40,-138.95)  198.87                80
 10/21/2019   10:24:44   (   0.02,-137.20) (  -0.61,-134.37)  322.37                80
 10/22/2019   22:46:25   (  -0.02,-137.20) (  -0.57,-139.61)  275.07                80
 10/23/2019   22:30:09   (  -0.02,-137.20) (   0.44,-135.03)  245.78                80
 10/25/2019   10:49:00   (   0.01,-137.19) (   0.72,-140.24)  348.36                80
 10/26/2019   10:32:46   (   0.01,-137.18) (  -0.35,-135.67)  172.36                80
 10/27/2019   22:51:45   (  -0.02,-137.17) (  -0.88,-140.90)  425.79                80
 10/28/2019   22:35:30   (  -0.02,-137.16) (   0.14,-136.33)   94.73                80
 10/31/2019   10:35:26   (   0.03,-137.13) (   0.02,-136.95)   20.01                80
 11/02/2019   22:38:10   (  -0.03,-137.09) (  -0.16,-137.62)   60.09                80