Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/14/2021   11:02:21   (   0.05,-137.19) (   0.71,-140.26)  349.53                80
 08/15/2021   10:40:42   (   0.05,-137.18) (  -0.28,-135.66)  172.75                80
 08/16/2021   23:02:18   (  -0.04,-137.16) (  -0.88,-140.87)  422.76                80
 08/17/2021   22:46:00   (  -0.04,-137.15) (   0.18,-136.28)   98.98                80
 08/19/2021   11:07:28   (   0.03,-137.13) (   1.01,-141.46)  493.45                80
 08/20/2021   10:48:30   (   0.02,-137.11) (  -0.05,-136.87)   27.90                80
 08/22/2021   22:48:27   (  -0.00,-137.07) (  -0.11,-137.48)   47.65                80
 08/23/2021   22:32:09   (  -0.00,-137.05) (   0.95,-132.90)  473.87                80
 08/25/2021   10:50:57   (   0.00,-137.03) (   0.23,-138.07)  118.78                80
 08/26/2021   10:34:38   (   0.01,-137.01) (  -0.77,-133.47)  402.48                80