Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/26/2021   10:49:20   (  -0.02,-137.20) (   0.16,-137.89)   79.93                80
 04/27/2021   10:27:43   (  -0.02,-137.19) (  -0.87,-133.31)  442.34                80
 04/28/2021   22:49:19   (   0.02,-137.18) (  -0.27,-138.52)  153.03                80
 04/29/2021   22:33:02   (   0.02,-137.17) (   0.76,-133.93)  368.78                80
 05/01/2021   10:54:30   (  -0.02,-137.15) (   0.40,-139.11)  223.36                80
 05/02/2021   10:32:52   (  -0.02,-137.14) (  -0.63,-134.53)  298.07                80
 05/03/2021   22:54:28   (   0.01,-137.11) (  -0.57,-139.73)  298.46                80
 05/04/2021   22:38:10   (   0.01,-137.09) (   0.47,-135.14)  222.96                80
 05/06/2021   10:59:38   (  -0.01,-137.07) (   0.75,-140.31)  369.50                80
 05/07/2021   10:38:00   (  -0.01,-137.06) (  -0.29,-135.72)  151.71                80