Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/06/2021   10:59:38   (  -0.01,-137.19) (   0.71,-140.31)  356.82                80
 05/07/2021   10:38:01   (  -0.02,-137.19) (  -0.32,-135.73)  165.79                80
 05/08/2021   23:02:17   (   0.01,-137.18) (  -0.83,-140.94)  428.18                80
 05/09/2021   22:40:40   (   0.01,-137.18) (   0.21,-136.35)   94.21                80
 05/11/2021   11:04:47   (  -0.01,-137.17) (   1.00,-141.52)  497.46                80
 05/12/2021   10:43:10   (  -0.01,-137.16) (  -0.04,-136.94)   24.54                80
 05/14/2021   22:45:48   (   0.01,-137.13) (  -0.08,-137.56)   49.74                80
 05/15/2021   22:29:31   (   0.01,-137.11) (   0.96,-132.98)  471.56                80
 05/17/2021   10:50:58   (  -0.01,-137.08) (   0.24,-138.15)  121.79                80
 05/18/2021   10:29:21   (  -0.01,-137.06) (  -0.80,-133.56)  399.03                80