Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 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)
 04/20/2021   18:37:27   (   0.03, -75.18) (  -0.07, -75.64)   51.95                80
 04/21/2021   18:21:09   (   0.03, -75.18) (   0.96, -71.05)  471.08                80
 04/23/2021   06:42:38   (  -0.02, -75.20) (   0.21, -76.23)  117.77                80
 04/24/2021   06:21:00   (  -0.02, -75.20) (  -0.82, -71.64)  405.40                80
 04/25/2021   18:42:36   (   0.02, -75.20) (  -0.33, -76.86)  188.86                80
 04/26/2021   18:26:19   (   0.02, -75.20) (   0.70, -72.27)  334.75                80
 04/28/2021   06:47:47   (  -0.02, -75.22) (   0.47, -77.45)  253.20                80
 04/29/2021   06:26:10   (  -0.02, -75.23) (  -0.56, -72.86)  270.31                80
 04/30/2021   18:47:45   (   0.02, -75.23) (  -0.64, -78.06)  323.74                80
 05/01/2021   18:31:28   (   0.02, -75.24) (   0.39, -73.48)  200.26                80