Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/10/2021   21:52:54   (   0.02,-128.14) (   0.96,-124.06)  465.73                80
 04/12/2021   10:14:21   (  -0.00,-128.10) (   0.27,-129.22)  129.10                80
 04/13/2021   09:52:43   (  -0.02,-128.07) (  -0.76,-124.64)  390.43                80
 04/14/2021   22:14:20   (   0.00,-128.03) (  -0.39,-129.85)  207.42                80
 04/15/2021   21:58:02   (   0.01,-128.00) (   0.63,-125.26)  312.52                80
 04/17/2021   10:19:31   (   0.00,-127.96) (   0.54,-130.44)  282.37                80
 04/18/2021   09:57:53   (  -0.01,-127.92) (  -0.49,-125.85)  236.40                80
 04/19/2021   22:19:28   (  -0.01,-127.86) (  -0.71,-131.06)  363.84                80
 04/20/2021   22:03:11   (  -0.00,-127.83) (   0.32,-126.47)  155.40                80
 04/22/2021   10:24:39   (   0.02,-127.79) (   0.86,-131.65)  439.29                80
 04/23/2021   10:03:02   (   0.01,-127.75) (  -0.17,-127.06)   78.99                80