Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 7 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/11/2020   10:25:04   (   0.03,-137.21) (  -0.69,-134.01)  364.51                80
 07/12/2020   22:46:42   (  -0.03,-137.23) (  -0.50,-139.23)  228.91                80
 07/13/2020   22:27:47   (  -0.02,-137.24) (   0.57,-134.66)  294.38                80
 07/15/2020   10:51:56   (   0.02,-137.26) (   0.63,-139.85)  295.89                80
 07/16/2020   10:30:20   (   0.01,-137.26) (  -0.44,-135.28)  226.64                80
 07/17/2020   22:51:59   (   0.00,-137.27) (  -0.74,-140.50)  368.71                80
 07/18/2020   22:35:43   (   0.01,-137.27) (   0.33,-135.93)  153.35                80
 07/20/2020   10:57:14   (  -0.01,-137.27) (   0.82,-141.13)  438.43                80
 07/21/2020   10:35:37   (  -0.01,-137.27) (  -0.19,-136.54)   83.30                80
 07/23/2020   22:40:59   (   0.01,-137.26) (   0.03,-137.19)    8.35                80