Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/02/2021   10:01:10   (   0.44,-128.27) (  -0.28,-124.97)  375.91                80
 09/03/2021   22:20:05   (  -0.43,-128.21) (  -0.88,-130.18)  224.85                80
 09/04/2021   22:03:48   (  -0.43,-128.20) (   0.18,-125.59)  297.41                80
 09/06/2021   10:22:35   (   0.42,-128.24) (   0.99,-130.77)  288.54                80
 09/07/2021   10:06:17   (   0.42,-128.23) (  -0.01,-126.17)  233.72                80
 09/08/2021   22:25:12   (  -0.41,-128.16) (  -1.14,-131.38)  367.50                80
 09/09/2021   22:08:53   (  -0.42,-128.14) (  -0.14,-126.78)  154.39                80
 09/11/2021   10:27:42   (   0.40,-128.17) (   1.25,-131.97)  432.81                80
 09/12/2021   10:11:23   (   0.41,-128.15) (   0.24,-127.37)   88.68                80
 09/14/2021   22:14:00   (  -0.40,-128.05) (  -0.39,-127.99)    7.01                80