Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/18/2021   22:57:57   (   0.04,-137.21) (  -0.82,-141.03)  436.42                80
 02/19/2021   22:41:40   (   0.04,-137.20) (   0.19,-136.44)   85.57                80
 02/22/2021   10:41:30   (  -0.03,-137.17) (  -0.06,-137.04)   15.14                80
 02/24/2021   22:44:10   (   0.01,-137.13) (  -0.11,-137.66)   60.75                80
 02/25/2021   22:27:53   (   0.01,-137.11) (   0.90,-133.07)  460.23                80
 02/27/2021   10:49:21   (  -0.00,-137.09) (   0.25,-138.26)  133.06                80
 02/28/2021   10:27:44   (  -0.00,-137.07) (  -0.76,-133.67)  387.34                80
 03/01/2021   22:49:21   (   0.00,-137.03) (  -0.42,-138.88)  211.21                80
 03/02/2021   22:33:03   (   0.01,-137.01) (   0.59,-134.29)  308.91                80