Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/04/2021   22:06:41   (   0.03,-128.27) (   0.20,-127.43)   95.02                80
 04/06/2021   10:28:09   (  -0.02,-128.23) (   0.97,-132.61)  499.23                80
 04/07/2021   10:06:32   (  -0.02,-128.21) (  -0.05,-128.02)   20.99                80
 04/09/2021   22:09:11   (   0.02,-128.17) (  -0.08,-128.64)   54.32                80
 04/10/2021   21:52:53   (   0.03,-128.15) (   0.94,-124.06)  466.58                80
 04/12/2021   10:14:22   (  -0.01,-128.11) (   0.23,-129.23)  127.57                80
 04/13/2021   09:52:44   (  -0.02,-128.09) (  -0.79,-124.65)  392.23                80
 04/14/2021   22:14:19   (   0.01,-128.05) (  -0.42,-129.85)  205.34                80
 04/15/2021   21:58:03   (   0.02,-128.03) (   0.67,-125.27)  314.95                80
 04/17/2021   10:19:30   (  -0.01,-127.99) (   0.57,-130.44)  279.29                80