Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 19.  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   10:55:42   (   0.04,-137.21) (   0.38,-138.84)  185.71                80
 07/20/2021   10:34:04   (   0.03,-137.21) (  -0.61,-134.25)  337.02                80
 07/21/2021   22:58:20   (  -0.03,-137.20) (  -0.55,-139.46)  257.89                80
 07/22/2021   22:36:43   (  -0.02,-137.19) (   0.51,-134.87)  264.48                80
 07/24/2021   11:00:50   (   0.02,-137.19) (   0.65,-140.05)  326.29                80
 07/25/2021   10:39:12   (   0.02,-137.18) (  -0.34,-135.45)  196.05                80
 07/26/2021   23:00:48   (  -0.03,-137.16) (  -0.80,-140.67)  399.01                80
 07/27/2021   22:44:30   (  -0.03,-137.16) (   0.20,-136.07)  123.37                80
 07/29/2021   11:05:57   (   0.03,-137.15) (   0.97,-141.24)  467.62                80
 07/30/2021   10:44:19   (   0.02,-137.14) (  -0.09,-136.66)   54.41                80
 08/01/2021   22:46:57   (  -0.02,-137.10) (  -0.04,-137.28)   20.12                80