Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/27/2021   22:01:20   (  -0.06,-128.36) (   0.53,-125.78)  294.59                80
 05/29/2021   10:22:48   (   0.06,-128.45) (   0.64,-130.95)  285.63                80
 05/30/2021   10:01:10   (   0.06,-128.46) (  -0.40,-126.37)  238.41                80
 05/31/2021   22:22:47   (  -0.06,-128.40) (  -0.78,-131.58)  362.03                80
 06/01/2021   22:06:29   (  -0.07,-128.41) (   0.26,-126.99)  162.57                80
 06/03/2021   10:27:56   (   0.07,-128.51) (   0.90,-132.16)  416.79                80
 06/04/2021   10:06:19   (   0.07,-128.52) (  -0.14,-127.58)  107.25                80
 06/05/2021   22:27:55   (  -0.07,-128.45) (  -1.05,-132.79)  494.37                80
 06/06/2021   22:11:38   (  -0.07,-128.46) (  -0.01,-128.20)   29.81                80
 06/09/2021   10:14:08   (   0.06,-128.56) (   0.12,-128.79)   26.32                80
 06/10/2021   09:52:30   (   0.06,-128.56) (  -0.92,-124.20)  496.85                80