Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/02/2021   10:10:36   (   0.19,-128.21) (   0.33,-128.87)   75.23                80
 01/03/2021   09:49:00   (   0.16,-128.20) (  -0.73,-124.30)  445.80                80
 01/04/2021   22:13:16   (  -0.21,-128.22) (  -0.48,-129.51)  145.76                80
 01/05/2021   21:51:40   (  -0.18,-128.21) (   0.57,-124.93)  374.97                80
 01/07/2021   10:15:48   (   0.22,-128.16) (   0.63,-130.10)  220.89                80
 01/08/2021   09:54:11   (   0.20,-128.14) (  -0.37,-125.51)  299.64                80
 01/09/2021   22:18:27   (  -0.25,-128.15) (  -0.84,-130.72)  292.90                80
 01/10/2021   21:56:50   (  -0.23,-128.13) (   0.21,-126.14)  227.13                80
 01/12/2021   10:20:59   (   0.27,-128.07) (   0.99,-131.32)  369.94                80
 01/13/2021   09:59:22   (   0.25,-128.05) (  -0.07,-126.74)  149.93                80
 01/14/2021   22:23:39   (  -0.29,-128.05) (  -1.14,-131.95)  443.32                80