Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2019   22:46:46   (   0.02,-137.19) (  -0.55,-139.68)  284.71                80
 09/16/2019   22:30:31   (   0.02,-137.19) (   0.51,-135.12)  237.10                80
 09/18/2019   10:52:02   (  -0.02,-137.21) (   0.66,-140.32)  354.60                80
 09/19/2019   10:30:27   (  -0.02,-137.21) (  -0.34,-135.74)  166.62                80
 09/20/2019   22:54:47   (   0.02,-137.20) (  -0.85,-140.98)  432.02                80
 09/21/2019   22:33:13   (   0.02,-137.19) (   0.21,-136.42)   88.67                80
 09/24/2019   10:35:49   (  -0.02,-137.18) (  -0.04,-137.05)   15.46                80
 09/26/2019   22:38:35   (   0.02,-137.14) (  -0.09,-137.72)   65.15                80
 09/27/2019   22:22:19   (   0.02,-137.13) (   0.91,-133.14)  454.65                80
 09/29/2019   10:41:10   (  -0.02,-137.12) (   0.25,-138.35)  139.68                80