Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 8 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/17/2020   10:24:02   (   0.03,-137.19) (  -0.77,-133.65)  404.15                80
 08/18/2020   22:45:40   (  -0.02,-137.19) (  -0.38,-138.88)  191.20                80
 08/19/2020   22:29:23   (  -0.01,-137.19) (   0.64,-134.29)  330.31                80
 08/21/2020   10:48:14   (   0.01,-137.18) (   0.52,-139.49)  262.93                80
 08/22/2020   10:31:57   (   0.01,-137.17) (  -0.50,-134.90)  258.59                80
 08/23/2020   22:50:54   (  -0.01,-137.17) (  -0.70,-140.12)  337.66                80
 08/24/2020   22:34:39   (  -0.01,-137.16) (   0.37,-135.55)  183.41                80
 08/26/2020   10:53:29   (   0.00,-137.13) (   0.79,-140.75)  411.24                80
 08/27/2020   10:37:13   (  -0.00,-137.12) (  -0.23,-136.17)  109.10                80
 08/28/2020   22:56:10   (   0.01,-137.10) (  -0.97,-141.38)  488.59                80
 08/29/2020   22:39:54   (   0.00,-137.08) (   0.05,-136.80)   31.83                80