Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 7 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/13/2021   18:45:17   (   0.08, -75.17) (   0.00, -76.67)  167.26                 0
 07/14/2021   18:27:35   (   0.07, -75.18) (   0.76, -72.02)  359.01                80
 07/16/2021   06:46:22   (  -0.08, -75.18) (   0.39, -77.20)  230.46                80
 07/17/2021   06:30:04   (  -0.08, -75.19) (  -0.66, -72.61)  293.50                80
 07/18/2021   18:49:01   (   0.09, -75.20) (  -0.50, -77.83)  299.02                80
 07/19/2021   18:32:43   (   0.09, -75.21) (   0.56, -73.24)  225.16                80
 07/21/2021   06:51:30   (  -0.10, -75.22) (   0.60, -78.42)  363.79                80
 07/22/2021   06:35:12   (  -0.10, -75.23) (  -0.39, -73.82)  160.36                80
 07/23/2021   18:54:08   (   0.12, -75.25) (  -0.75, -79.03)  431.88                80
 07/24/2021   18:37:51   (   0.11, -75.26) (   0.30, -74.45)   92.94                80
 07/26/2021   06:56:38   (  -0.12, -75.29) (   0.87, -79.62)  494.35                80
 07/27/2021   06:40:21   (  -0.12, -75.31) (  -0.19, -75.04)   30.94                80