Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 6 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2020   10:33:28   (   0.02,-137.20) (  -0.23,-136.07)  128.62                80
 07/01/2020   22:57:47   (  -0.01,-137.20) (  -0.91,-141.31)  467.89                80
 07/02/2020   22:36:11   (  -0.00,-137.19) (   0.10,-136.72)   53.74                80
 07/05/2020   10:41:24   (  -0.01,-137.19) (   0.02,-137.34)   16.77                80
 07/07/2020   22:41:27   (   0.01,-137.17) (  -0.15,-137.99)   92.84                80
 07/08/2020   22:25:11   (   0.01,-137.17) (   0.86,-133.41)  428.51                80
 07/10/2020   10:46:40   (  -0.01,-137.16) (   0.33,-138.59)  163.85                80
 07/11/2020   10:25:05   (  -0.01,-137.15) (  -0.74,-134.02)  357.29                80
 07/12/2020   22:46:43   (   0.01,-137.13) (  -0.44,-139.25)  240.61                80
 07/13/2020   22:30:26   (   0.01,-137.12) (   0.57,-134.66)  280.23                80