Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 2 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/21/2021   22:03:15   (   0.18,-128.09) (   0.48,-126.87)  138.99                80
 02/23/2021   10:24:42   (  -0.17,-128.09) (   0.71,-132.05)  450.34                80
 02/24/2021   10:03:05   (  -0.17,-128.11) (  -0.30,-127.46)   74.45                80
 02/26/2021   22:08:26   (   0.16,-128.19) (   0.19,-128.10)   11.33                80
 03/01/2021   10:10:56   (  -0.16,-128.22) (  -0.07,-128.69)   53.77                80
 03/02/2021   09:49:19   (  -0.16,-128.23) (  -1.08,-124.10)  470.33                80
 03/03/2021   22:10:56   (   0.15,-128.28) (  -0.09,-129.32)  119.12                80
 03/04/2021   21:54:39   (   0.16,-128.29) (   0.93,-124.73)  405.16                80
 03/06/2021   10:16:07   (  -0.14,-128.29) (   0.21,-129.91)  185.23                80