Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 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)
 07/19/2021   10:55:43   (   0.04,-137.21) (   0.38,-138.85)  185.82                80
 07/20/2021   10:34:04   (   0.03,-137.21) (  -0.61,-134.25)  336.92                80
 07/21/2021   22:58:20   (  -0.03,-137.20) (  -0.54,-139.46)  258.03                80
 07/22/2021   22:36:43   (  -0.02,-137.19) (   0.52,-134.88)  264.33                80
 07/24/2021   11:00:50   (   0.02,-137.18) (   0.64,-140.05)  326.45                80
 07/25/2021   10:39:12   (   0.01,-137.18) (  -0.35,-135.45)  195.86                80
 07/26/2021   23:00:48   (  -0.03,-137.16) (  -0.79,-140.67)  399.19                80
 07/27/2021   22:44:30   (  -0.03,-137.15) (   0.21,-136.07)  123.20                80
 07/29/2021   11:05:57   (   0.03,-137.14) (   0.96,-141.25)  467.77                80
 07/30/2021   10:44:19   (   0.02,-137.13) (  -0.10,-136.66)   54.27                80