Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2021   22:24:22   (  -0.01,-128.35) (  -0.81,-131.81)  394.81                80
 06/22/2021   22:08:05   (  -0.02,-128.34) (   0.24,-127.23)  127.08                80
 06/24/2021   10:26:52   (   0.00,-128.40) (   0.89,-132.41)  456.05                80
 06/25/2021   10:07:54   (   0.01,-128.39) (  -0.09,-127.81)   65.30                80
 06/27/2021   22:10:32   (  -0.01,-128.25) (  -0.05,-128.43)   20.24                80
 06/30/2021   10:13:02   (   0.00,-128.30) (   0.14,-129.02)   81.87                80
 07/01/2021   09:56:44   (   0.01,-128.28) (  -0.85,-124.42)  439.49                80
 07/02/2021   22:15:40   (   0.00,-128.16) (  -0.33,-129.63)  167.94                80
 07/03/2021   21:59:23   (  -0.00,-128.14) (   0.72,-125.05)  353.36                80
 07/05/2021   10:18:10   (  -0.01,-128.20) (   0.42,-130.22)  230.22                80