Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 1 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)
 01/13/2021   06:39:00   (  -0.00, -75.18) (   0.19, -75.93)   86.68                80
 01/14/2021   06:17:23   (   0.00, -75.18) (  -0.87, -71.36)  436.24                80
 01/15/2021   18:39:00   (  -0.01, -75.20) (  -0.29, -76.57)  156.69                80
 01/16/2021   18:22:43   (  -0.01, -75.20) (   0.71, -71.98)  366.93                80
 01/18/2021   06:44:11   (   0.01, -75.21) (   0.48, -77.16)  222.66                80
 01/19/2021   06:22:35   (   0.01, -75.23) (  -0.59, -72.58)  301.21                80
 01/20/2021   18:44:12   (  -0.01, -75.25) (  -0.58, -77.80)  290.68                80
 01/21/2021   18:27:55   (  -0.01, -75.27) (   0.42, -73.21)  233.67                80
 01/23/2021   06:49:24   (   0.01, -75.29) (   0.69, -78.40)  354.63                80
 01/24/2021   06:27:46   (   0.01, -75.31) (  -0.31, -73.81)  169.69                80
 01/25/2021   18:49:24   (  -0.02, -75.33) (  -0.86, -79.03)  421.97                80
 01/26/2021   18:33:07   (  -0.02, -75.35) (   0.21, -74.46)  102.70                80