Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/14/2021   10:50:35   (   0.04,-137.19) (   0.13,-137.64)   50.84                80
 07/15/2021   10:28:57   (   0.03,-137.20) (  -0.92,-133.05)  472.94                80
 07/16/2021   22:53:13   (  -0.04,-137.20) (  -0.30,-138.25)  120.19                80
 07/17/2021   22:31:35   (  -0.03,-137.21) (   0.75,-133.67)  403.16                80
 07/19/2021   10:55:42   (   0.03,-137.21) (   0.40,-138.84)  186.79                80
 07/20/2021   10:34:05   (   0.02,-137.20) (  -0.65,-134.26)  335.76                80
 07/21/2021   22:58:21   (  -0.01,-137.19) (  -0.50,-139.47)  259.37                80
 07/22/2021   22:36:44   (   0.01,-137.19) (   0.55,-134.89)  262.65                80
 07/24/2021   11:00:51   (  -0.02,-137.17) (   0.61,-140.06)  328.78                80
 07/25/2021   10:39:13   (  -0.02,-137.16) (  -0.38,-135.46)  193.43                80
 07/26/2021   23:00:49   (   0.02,-137.15) (  -0.76,-140.68)  401.80                80