Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 2 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/18/2021   10:19:31   (  -0.19,-127.96) (   0.44,-130.82)  326.06                80
 02/19/2021   09:57:54   (  -0.19,-127.98) (  -0.57,-126.23)  199.54                80
 02/20/2021   22:19:32   (   0.18,-128.06) (  -0.56,-131.46)  386.87                80
 02/21/2021   22:03:15   (   0.18,-128.09) (   0.45,-126.87)  138.82                80
 02/23/2021   10:24:43   (  -0.17,-128.09) (   0.69,-132.05)  450.58                80
 02/24/2021   10:03:05   (  -0.17,-128.11) (  -0.32,-127.46)   74.18                80
 02/26/2021   22:08:26   (   0.16,-128.19) (   0.20,-128.10)   11.14                80
 03/01/2021   10:10:57   (  -0.16,-128.21) (  -0.06,-128.69)   54.29                80
 03/02/2021   09:49:20   (  -0.16,-128.23) (  -1.07,-124.10)  469.75                80
 03/03/2021   22:10:57   (   0.15,-128.27) (  -0.10,-129.32)  119.75                80