Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2020   10:19:10   (   0.12,-128.24) (   0.75,-131.01)  315.24                80
 12/23/2020   09:57:34   (   0.10,-128.25) (  -0.31,-126.43)  207.35                80
 12/24/2020   22:21:50   (  -0.14,-128.28) (  -0.90,-131.64)  383.00                80
 12/25/2020   22:00:13   (  -0.12,-128.28) (   0.15,-127.06)  139.05                80
 12/27/2020   10:24:22   (   0.17,-128.25) (   1.07,-132.23)  453.86                80
 12/28/2020   10:02:45   (   0.14,-128.25) (   0.02,-127.65)   67.99                80
 12/30/2020   22:07:39   (  -0.17,-128.26) (  -0.17,-128.28)    2.15                54
 01/02/2021   10:10:37   (   0.19,-128.22) (   0.34,-128.88)   75.55                80
 01/03/2021   09:49:00   (   0.16,-128.21) (  -0.72,-124.30)  445.39                80
 01/04/2021   22:13:17   (  -0.21,-128.22) (  -0.49,-129.51)  146.98                80