Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/12/2021   22:40:53   (  -0.05,-137.19) (   0.45,-135.09)  241.10                80
 08/14/2021   11:02:21   (   0.05,-137.19) (   0.72,-140.26)  349.79                80
 08/15/2021   10:40:42   (   0.05,-137.18) (  -0.27,-135.66)  172.43                80
 08/16/2021   23:02:18   (  -0.04,-137.16) (  -0.89,-140.87)  423.14                80
 08/17/2021   22:46:00   (  -0.04,-137.15) (   0.16,-136.28)   98.51                80
 08/19/2021   11:04:47   (   0.03,-137.12) (   1.02,-141.45)  494.07                80
 08/20/2021   10:48:30   (   0.02,-137.11) (  -0.04,-136.87)   27.12                80
 08/22/2021   22:48:27   (  -0.00,-137.06) (  -0.12,-137.48)   48.52                80
 08/23/2021   22:32:09   (  -0.00,-137.04) (   0.94,-132.90)  472.98                80
 08/25/2021   10:50:57   (   0.00,-137.02) (   0.25,-138.07)  119.85                80