Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/24/2021   10:26:52   (  -0.00,-128.40) (   0.91,-132.40)  456.28                80
 06/25/2021   10:10:34   (   0.00,-128.38) (  -0.14,-127.82)   65.00                80
 06/27/2021   22:10:32   (  -0.00,-128.25) (  -0.06,-128.43)   20.47                80
 06/30/2021   10:13:02   (  -0.00,-128.30) (   0.15,-129.02)   82.14                80
 07/01/2021   09:56:44   (   0.01,-128.28) (  -0.84,-124.42)  439.15                80
 07/02/2021   22:15:40   (   0.01,-128.16) (  -0.34,-129.63)  168.20                80
 07/03/2021   21:59:22   (  -0.00,-128.14) (   0.71,-125.04)  353.09                80
 07/05/2021   10:18:10   (  -0.02,-128.20) (   0.43,-130.22)  230.60                80
 07/06/2021   10:01:51   (  -0.01,-128.17) (  -0.56,-125.62)  290.03                80