Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 21.  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)  315.25                80
 12/23/2020   09:57:33   (   0.10,-128.25) (  -0.30,-126.43)  207.38                80
 12/24/2020   22:21:50   (  -0.14,-128.28) (  -0.91,-131.64)  382.92                80
 12/25/2020   22:00:13   (  -0.12,-128.28) (   0.15,-127.06)  139.16                80
 12/27/2020   10:24:22   (   0.17,-128.26) (   1.08,-132.23)  453.71                80
 12/28/2020   10:02:45   (   0.14,-128.25) (   0.02,-127.65)   68.20                80
 12/30/2020   22:08:05   (  -0.17,-128.27) (  -0.17,-128.28)    1.77                80
 01/02/2021   10:10:37   (   0.19,-128.22) (   0.34,-128.88)   75.19                80
 01/03/2021   09:49:00   (   0.16,-128.21) (  -0.71,-124.30)  445.80                80