Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/01/2021   22:06:29   (  -0.06,-128.41) (   0.27,-126.99)  162.30                80
 06/03/2021   10:27:56   (   0.06,-128.50) (   0.89,-132.16)  417.94                80
 06/04/2021   10:06:19   (   0.07,-128.51) (  -0.15,-127.58)  105.91                80
 06/05/2021   22:27:55   (  -0.06,-128.44) (  -1.03,-132.79)  495.48                80
 06/06/2021   22:11:38   (  -0.06,-128.45) (   0.01,-128.20)   28.58                80
 06/09/2021   10:14:08   (   0.06,-128.54) (   0.10,-128.79)   28.69                80
 06/10/2021   09:52:30   (   0.06,-128.53) (  -0.94,-124.21)  494.32                80
 06/11/2021   22:14:06   (  -0.05,-128.45) (  -0.24,-129.41)  108.96                80
 06/12/2021   21:57:48   (  -0.05,-128.45) (   0.75,-124.82)  414.16                80
 06/14/2021   10:19:15   (   0.05,-128.53) (   0.40,-129.99)  167.34                80