Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2020   22:08:04   (  -0.17,-128.26) (  -0.18,-128.28)    2.01                80
 01/02/2021   10:10:36   (   0.19,-128.21) (   0.34,-128.87)   75.55                80
 01/03/2021   09:49:00   (   0.16,-128.20) (  -0.72,-124.30)  445.37                80
 01/04/2021   22:13:16   (  -0.21,-128.22) (  -0.48,-129.51)  146.73                80
 01/05/2021   21:51:40   (  -0.18,-128.20) (   0.58,-124.93)  373.90                80
 01/07/2021   10:15:47   (   0.22,-128.15) (   0.69,-130.09)  221.77                80
 01/08/2021   09:54:10   (   0.20,-128.14) (  -0.37,-125.51)  298.66                80
 01/09/2021   22:18:27   (  -0.25,-128.14) (  -0.83,-130.72)  294.35                80
 01/10/2021   21:56:50   (  -0.23,-128.12) (   0.23,-126.14)  225.57                80