Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 10 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/14/2020   10:27:37   (   0.03,-137.21) (  -0.78,-133.67)  403.50                80
 10/15/2020   22:46:35   (  -0.03,-137.21) (  -0.41,-138.89)  192.03                80
 10/16/2020   22:30:18   (  -0.03,-137.21) (   0.63,-134.31)  330.34                80
 10/18/2020   10:49:07   (   0.03,-137.21) (   0.57,-139.49)  261.05                80
 10/19/2020   10:32:50   (   0.03,-137.20) (  -0.46,-134.91)  260.79                80
 10/20/2020   22:51:50   (  -0.03,-137.19) (  -0.66,-140.15)  336.25                80
 10/21/2020   22:35:32   (  -0.03,-137.18) (   0.31,-135.55)  185.14                80
 10/23/2020   10:54:21   (   0.02,-137.17) (   0.83,-140.75)  407.59                80
 10/24/2020   10:38:05   (   0.02,-137.16) (  -0.20,-136.17)  113.48                80
 10/25/2020   22:57:03   (  -0.01,-137.14) (  -0.97,-141.39)  484.27                80
 10/26/2020   22:40:47   (  -0.01,-137.13) (   0.07,-136.81)   36.77                80