Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2021   22:08:19   (  -0.03,-127.64) (  -0.06,-127.66)    3.75                80
 04/28/2021   10:10:50   (   0.03,-127.55) (   0.19,-128.25)   79.52                80
 04/29/2021   09:49:12   (   0.02,-127.50) (  -0.84,-123.66)  437.99                80
 04/30/2021   22:10:48   (  -0.03,-127.41) (  -0.36,-128.86)  165.63                80
 05/01/2021   21:54:30   (  -0.02,-127.37) (   0.67,-124.28)  352.40                80
 05/03/2021   10:15:58   (   0.03,-127.32) (   0.49,-129.46)  242.66                80
 05/04/2021   09:54:20   (   0.03,-127.27) (  -0.48,-124.86)  274.63                80
 05/05/2021   22:15:55   (  -0.04,-127.17) (  -0.71,-130.06)  330.48                80
 05/06/2021   21:59:38   (  -0.03,-127.12) (   0.32,-125.47)  187.55                80