Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/08/2021   10:15:16   (   0.28,-127.96) (   0.48,-128.76)   91.04                80
 10/09/2021   09:58:57   (   0.30,-127.99) (  -0.54,-124.16)  436.07                80
 10/10/2021   22:17:54   (  -0.27,-128.02) (  -0.59,-129.38)  155.50                80
 10/11/2021   22:01:35   (  -0.28,-128.04) (   0.42,-124.78)  371.09                80
 10/13/2021   10:20:22   (   0.25,-128.10) (   0.68,-129.96)  212.66                80
 10/14/2021   10:04:04   (   0.26,-128.12) (  -0.34,-125.37)  313.69                80
 10/15/2021   22:23:00   (  -0.23,-128.14) (  -0.79,-130.58)  278.67                80
 10/16/2021   22:06:42   (  -0.24,-128.17) (   0.23,-125.99)  247.79                80
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.87,-131.17)  335.87                80
 10/19/2021   10:09:11   (   0.23,-128.25) (  -0.15,-126.58)  190.57                80
 10/20/2021   22:28:07   (  -0.20,-128.27) (  -0.98,-131.79)  401.93                80