Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2021   22:01:28   (   0.04,-128.00) (   0.91,-124.25)  428.45                80
 12/27/2021   10:21:10   (  -0.05,-128.05) (   0.29,-129.64)  181.21                80
 12/28/2021   10:05:27   (  -0.05,-128.07) (  -0.71,-125.19)  328.67                80
 12/29/2021   22:25:18   (   0.06,-128.10) (  -0.52,-130.62)  287.38                80
 12/30/2021   22:09:35   (   0.05,-128.12) (   0.48,-126.17)  222.10                80
 01/01/2022   10:29:16   (  -0.06,-128.16) (   0.73,-131.56)  388.82                80
 01/02/2022   10:13:34   (  -0.05,-128.17) (  -0.27,-127.12)  120.07                80
 01/03/2022   22:33:24   (   0.05,-128.19) (  -0.94,-132.55)  497.33                80
 01/04/2022   22:17:42   (   0.05,-128.20) (   0.07,-128.10)   11.45                80
 01/07/2022   10:19:01   (  -0.05,-128.25) (   0.15,-129.05)   91.32                80