Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/03/2021   10:27:57   (   0.06,-128.50) (   0.88,-132.17)  418.11                80
 06/04/2021   10:06:19   (   0.07,-128.50) (  -0.17,-127.58)  105.70                80
 06/05/2021   22:27:56   (  -0.06,-128.44) (  -1.02,-132.79)  495.74                80
 06/06/2021   22:11:38   (  -0.06,-128.44) (   0.02,-128.20)   28.37                80
 06/09/2021   10:14:08   (   0.05,-128.53) (   0.09,-128.79)   29.41                80
 06/10/2021   09:52:29   (   0.06,-128.53) (  -0.89,-124.19)  493.59                80
 06/11/2021   22:14:06   (  -0.05,-128.45) (  -0.29,-129.40)  109.70                80
 06/12/2021   21:57:48   (  -0.05,-128.45) (   0.75,-124.82)  413.33                80
 06/14/2021   10:19:16   (   0.05,-128.52) (   0.40,-129.99)  168.41                80
 06/15/2021   09:57:38   (   0.05,-128.51) (  -0.64,-125.41)  354.01                80