Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2020   10:02:45   (   0.14,-128.25) (   0.04,-127.65)   67.93                80
 12/30/2020   22:08:04   (  -0.17,-128.26) (  -0.18,-128.28)    2.37                80
 01/02/2021   10:10:36   (   0.19,-128.21) (   0.34,-128.87)   75.71                80
 01/03/2021   09:49:00   (   0.16,-128.20) (  -0.72,-124.30)  445.18                80
 01/04/2021   22:13:16   (  -0.21,-128.21) (  -0.49,-129.50)  147.09                80
 01/05/2021   21:51:40   (  -0.18,-128.20) (   0.57,-124.93)  373.48                80
 01/07/2021   10:15:48   (   0.22,-128.15) (   0.64,-130.10)  222.12                80
 01/08/2021   09:54:10   (   0.20,-128.13) (  -0.36,-125.51)  298.28                80
 01/09/2021   22:18:27   (  -0.25,-128.14) (  -0.84,-130.72)  294.89                80
 01/10/2021   21:56:50   (  -0.23,-128.12) (   0.22,-126.14)  224.99                80