Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 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)
 06/30/2021   10:13:02   (  -0.01,-128.28) (   0.13,-129.02)   84.05                80
 07/01/2021   09:56:44   (  -0.00,-128.26) (  -0.85,-124.42)  436.93                80
 07/02/2021   22:15:40   (   0.02,-128.14) (  -0.33,-129.63)  170.15                80
 07/03/2021   21:59:23   (   0.01,-128.12) (   0.71,-125.05)  350.81                80
 07/05/2021   10:18:10   (  -0.03,-128.17) (   0.42,-130.23)  234.18                80
 07/06/2021   10:01:51   (  -0.02,-128.14) (  -0.56,-125.63)  286.11                80
 07/07/2021   22:20:48   (   0.04,-128.01) (  -0.62,-130.84)  322.65                80
 07/08/2021   22:04:30   (   0.03,-127.98) (   0.43,-126.25)  197.47                80
 07/10/2021   10:23:18   (  -0.05,-128.02) (   0.71,-131.43)  388.41                80
 07/11/2021   10:06:59   (  -0.04,-127.99) (  -0.27,-126.83)  131.23                80
 07/12/2021   22:25:55   (   0.06,-127.84) (  -0.90,-132.04)  478.76                80
 07/13/2021   22:09:38   (   0.05,-127.81) (   0.15,-127.45)   40.92                80