Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.89,-131.16)  335.11                80
 10/19/2021   10:09:10   (   0.23,-128.25) (  -0.13,-126.57)  191.21                80
 10/20/2021   22:28:06   (  -0.20,-128.27) (  -1.01,-131.78)  401.20                80
 10/21/2021   22:11:48   (  -0.21,-128.29) (   0.02,-127.19)  124.90                80
 10/23/2021   10:30:35   (   0.18,-128.33) (   1.07,-132.37)  459.96                80
 10/24/2021   10:14:17   (   0.20,-128.35) (   0.05,-127.78)   65.68                80
 10/26/2021   22:14:14   (  -0.19,-128.37) (  -0.21,-128.38)    3.83                80
 10/29/2021   10:16:42   (   0.17,-128.41) (   0.28,-128.98)   64.01                80
 10/30/2021   10:00:24   (   0.18,-128.42) (  -0.75,-124.38)  460.81                80
 10/31/2021   22:19:19   (  -0.15,-128.41) (  -0.43,-129.58)  133.95                80