Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2021   22:55:40   (  -0.03,-137.20) (  -0.54,-139.46)  257.86                80
 07/22/2021   22:39:23   (  -0.02,-137.19) (   0.51,-134.88)  264.54                80
 07/24/2021   11:00:50   (   0.02,-137.18) (   0.64,-140.05)  326.22                80
 07/25/2021   10:39:12   (   0.02,-137.18) (  -0.35,-135.45)  196.17                80
 07/26/2021   23:00:48   (  -0.03,-137.16) (  -0.79,-140.67)  399.06                80
 07/27/2021   22:44:30   (  -0.03,-137.16) (   0.20,-136.07)  123.31                80
 07/29/2021   11:05:57   (   0.02,-137.15) (   0.96,-141.24)  467.65                80
 07/30/2021   10:44:19   (   0.02,-137.13) (  -0.09,-136.66)   54.37                80
 08/01/2021   22:46:57   (  -0.02,-137.10) (  -0.05,-137.28)   20.18                80