Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/22/2021   22:39:23   (  -0.03,-137.19) (   0.52,-134.88)  264.60                80
 07/24/2021   11:00:49   (   0.03,-137.18) (   0.69,-140.04)  326.37                80
 07/25/2021   10:39:12   (   0.03,-137.17) (  -0.36,-135.45)  195.80                80
 07/26/2021   23:00:47   (  -0.04,-137.16) (  -0.84,-140.66)  399.51                80
 07/27/2021   22:44:30   (  -0.04,-137.15) (   0.21,-136.07)  122.75                80
 07/29/2021   11:05:57   (   0.04,-137.14) (   0.95,-141.25)  468.39                80
 07/30/2021   10:44:19   (   0.03,-137.12) (  -0.05,-136.65)   53.56                80
 08/01/2021   22:46:56   (  -0.03,-137.09) (  -0.09,-137.27)   21.34                80
 08/04/2021   10:52:06   (  -0.01,-137.04) (   0.20,-137.86)   93.46                80