Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 10 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/13/2020   10:43:53   (   0.03,-137.20) (   0.28,-138.25)  119.33                80
 10/14/2020   10:27:36   (   0.03,-137.21) (  -0.75,-133.67)  403.13                80
 10/15/2020   22:46:35   (  -0.02,-137.21) (  -0.37,-138.90)  192.60                80
 10/16/2020   22:30:18   (  -0.03,-137.20) (   0.60,-134.31)  329.65                80
 10/18/2020   10:49:07   (   0.02,-137.20) (   0.54,-139.50)  261.99                80
 10/19/2020   10:32:51   (   0.03,-137.19) (  -0.49,-134.92)  259.66                80
 10/20/2020   22:51:49   (  -0.02,-137.18) (  -0.69,-140.14)  337.54                80
 10/21/2020   22:35:33   (  -0.02,-137.17) (   0.35,-135.56)  183.67                80
 10/23/2020   10:54:21   (   0.02,-137.16) (   0.85,-140.74)  409.31                80
 10/24/2020   10:38:04   (   0.01,-137.14) (  -0.18,-136.16)  111.64                80
 10/25/2020   22:57:03   (  -0.01,-137.12) (  -0.99,-141.39)  486.32                80
 10/26/2020   22:40:46   (  -0.01,-137.11) (   0.05,-136.81)   34.58                80