Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 9 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2021   18:53:30   (   0.12, -75.21) (  -0.60, -78.45)  368.33                80
 09/20/2021   18:37:11   (   0.12, -75.22) (   0.41, -73.85)  156.05                80
 09/22/2021   06:58:38   (  -0.11, -75.24) (   0.74, -79.03)  431.20                80
 09/23/2021   06:37:01   (  -0.12, -75.26) (  -0.33, -74.44)   93.45                80
 09/24/2021   19:01:15   (   0.11, -75.27) (  -0.90, -79.64)  498.04                80
 09/25/2021   18:39:38   (   0.12, -75.29) (   0.17, -75.05)   26.93                80
 09/28/2021   06:44:47   (  -0.12, -75.34) (  -0.04, -75.64)   34.33                80
 09/29/2021   06:23:09   (  -0.12, -75.35) (  -1.11, -71.05)  490.65                80
 09/30/2021   18:47:24   (   0.12, -75.38) (  -0.06, -76.26)  100.21                80
 10/01/2021   18:25:46   (   0.13, -75.40) (   0.96, -71.66)  425.24                80