Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/01/2021   09:56:44   (  -0.00,-128.26) (  -0.86,-124.43)  436.83                80
 07/02/2021   22:15:40   (   0.02,-128.14) (  -0.33,-129.63)  170.16                80
 07/03/2021   21:59:23   (   0.01,-128.12) (   0.72,-125.05)  350.75                80
 07/05/2021   10:18:10   (  -0.03,-128.17) (   0.41,-130.23)  234.47                80
 07/06/2021   10:01:51   (  -0.02,-128.14) (  -0.57,-125.63)  285.79                80
 07/07/2021   22:20:48   (   0.04,-128.01) (  -0.60,-130.84)  322.86                80
 07/08/2021   22:04:30   (   0.04,-127.98) (   0.45,-126.25)  197.22                80
 07/10/2021   10:23:18   (  -0.05,-128.01) (   0.69,-131.43)  388.89                80
 07/11/2021   10:06:59   (  -0.05,-127.98) (  -0.29,-126.83)  130.70                80
 07/12/2021   22:25:55   (   0.06,-127.84) (  -0.87,-132.04)  479.16                80
 07/13/2021   22:09:37   (   0.05,-127.80) (   0.12,-127.44)   40.43                80