Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/30/2021   22:01:32   (   0.06,-128.35) (   0.55,-126.23)  241.89                80
 04/01/2021   10:23:00   (  -0.04,-128.32) (   0.67,-131.40)  351.52                80
 04/02/2021   10:01:23   (  -0.05,-128.30) (  -0.41,-126.82)  169.11                80
 04/03/2021   22:22:59   (   0.04,-128.28) (  -0.82,-132.02)  426.64                80
 04/04/2021   22:06:41   (   0.04,-128.27) (   0.20,-127.43)   94.55                80
 04/06/2021   10:28:09   (  -0.02,-128.24) (   0.96,-132.61)  498.55                80
 04/07/2021   10:06:32   (  -0.03,-128.22) (  -0.06,-128.02)   21.80                80
 04/09/2021   22:09:11   (   0.03,-128.17) (  -0.07,-128.65)   54.24                80
 04/10/2021   21:52:53   (   0.03,-128.15) (   0.96,-124.06)  466.79                80
 04/12/2021   10:14:22   (  -0.02,-128.13) (   0.21,-129.24)  126.25                80