Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2021   18:37:11   (   0.12, -75.20) (   0.40, -73.85)  153.42                80
 09/22/2021   06:58:38   (  -0.11, -75.20) (   0.75, -79.02)  436.03                80
 09/23/2021   06:37:00   (  -0.12, -75.20) (  -0.26, -74.43)   87.23                80
 09/25/2021   18:39:38   (   0.12, -75.20) (   0.16, -75.05)   17.21                80
 09/28/2021   06:44:46   (  -0.12, -75.21) (  -0.03, -75.63)   47.70                80
 09/29/2021   06:23:08   (  -0.12, -75.22) (  -1.05, -71.04)  475.89                80
 09/30/2021   18:47:23   (   0.12, -75.22) (  -0.13, -76.24)  117.07                80
 10/01/2021   18:25:46   (   0.13, -75.23) (   0.94, -71.66)  406.96                80
 10/03/2021   06:49:52   (  -0.12, -75.25) (   0.25, -76.83)  180.32                80