Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/25/2021   09:56:02   (   0.07,-128.39) (  -0.67,-125.16)  368.92                80
 05/26/2021   22:17:38   (  -0.06,-128.35) (  -0.50,-130.37)  230.26                80
 05/27/2021   22:01:21   (  -0.06,-128.36) (   0.53,-125.78)  294.49                80
 05/29/2021   10:22:48   (   0.06,-128.45) (   0.64,-130.95)  285.31                80
 05/30/2021   10:01:10   (   0.07,-128.46) (  -0.40,-126.37)  238.76                80
 05/31/2021   22:22:47   (  -0.07,-128.40) (  -0.78,-131.58)  361.93                80
 06/01/2021   22:06:29   (  -0.07,-128.42) (   0.26,-126.99)  162.69                80
 06/03/2021   10:27:56   (   0.07,-128.52) (   0.90,-132.17)  416.32                80
 06/04/2021   10:06:19   (   0.07,-128.53) (  -0.14,-127.58)  107.76                80
 06/05/2021   22:27:55   (  -0.07,-128.45) (  -1.04,-132.79)  494.04                80
 06/06/2021   22:11:38   (  -0.07,-128.47) (   0.00,-128.20)   30.19                80