Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 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)
 02/24/2021   22:44:11   (   0.03,-137.20) (  -0.05,-137.68)   53.22                80
 02/25/2021   22:27:54   (   0.03,-137.20) (   0.96,-133.09)  469.22                80
 02/27/2021   10:49:21   (  -0.02,-137.19) (   0.23,-138.26)  121.81                80
 02/28/2021   10:27:43   (  -0.02,-137.18) (  -0.79,-133.67)  399.98                80
 03/01/2021   22:49:21   (   0.02,-137.17) (  -0.39,-138.88)  196.50                80
 03/02/2021   22:33:04   (   0.02,-137.15) (   0.68,-134.31)  325.02                80
 03/04/2021   10:54:31   (  -0.02,-137.14) (   0.51,-139.48)  267.28                80
 03/05/2021   10:32:54   (  -0.02,-137.12) (  -0.50,-134.89)  253.63                80
 03/06/2021   22:54:31   (   0.01,-137.09) (  -0.67,-140.11)  344.32                80
 03/07/2021   22:38:14   (   0.00,-137.07) (   0.35,-135.52)  176.38                80
 03/09/2021   10:59:41   (   0.00,-137.04) (   0.85,-140.69)  416.95                80