Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/27/2021   22:44:30   (  -0.04,-137.19) (   0.22,-136.07)  127.20                80
 07/29/2021   11:05:57   (   0.03,-137.20) (   0.94,-141.25)  460.80                80
 07/30/2021   10:44:20   (   0.03,-137.21) (  -0.11,-136.66)   63.01                80
 08/01/2021   22:46:58   (  -0.03,-137.21) (  -0.03,-137.28)    7.52                80
 08/04/2021   10:52:07   (  -0.01,-137.22) (   0.14,-137.87)   74.67                80
 08/05/2021   10:30:30   (  -0.02,-137.21) (  -0.91,-133.28)  447.94                80
 08/06/2021   22:52:05   (   0.01,-137.20) (  -0.27,-138.49)  147.24                80
 08/07/2021   22:35:47   (   0.01,-137.19) (   0.72,-133.89)  375.22                80
 08/09/2021   10:57:15   (  -0.01,-137.18) (   0.40,-139.08)  215.50                80