Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/15/2021   10:28:56   (   0.04,-137.20) (  -0.87,-133.04)  473.07                80
 07/16/2021   22:53:13   (  -0.04,-137.20) (  -0.30,-138.25)  120.01                80
 07/17/2021   22:31:35   (  -0.04,-137.21) (   0.75,-133.67)  403.36                80
 07/19/2021   10:55:42   (   0.03,-137.21) (   0.40,-138.84)  186.46                80
 07/20/2021   10:34:05   (   0.03,-137.20) (  -0.65,-134.26)  336.15                80
 07/21/2021   22:58:20   (  -0.02,-137.20) (  -0.56,-139.46)  258.88                80
 07/22/2021   22:36:43   (  -0.01,-137.19) (   0.50,-134.88)  263.31                80
 07/24/2021   11:00:50   (  -0.00,-137.18) (   0.66,-140.05)  328.08                80
 07/25/2021   10:39:13   (  -0.02,-137.17) (  -0.39,-135.46)  193.89                80
 07/26/2021   23:00:49   (   0.02,-137.15) (  -0.75,-140.68)  401.52                80
 07/27/2021   22:44:30   (   0.01,-137.15) (   0.24,-136.08)  121.01                80