Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/07/2021   10:06:17   (   0.42,-128.24) (  -0.05,-126.18)  235.03                80
 09/08/2021   22:25:12   (  -0.41,-128.17) (  -1.11,-131.38)  365.83                80
 09/09/2021   22:08:54   (  -0.42,-128.16) (  -0.11,-126.79)  156.30                80
 09/11/2021   10:27:41   (   0.41,-128.19) (   1.27,-131.96)  430.44                80
 09/12/2021   10:11:24   (   0.41,-128.17) (   0.21,-127.38)   91.34                80
 09/14/2021   22:14:01   (  -0.40,-128.07) (  -0.36,-127.99)   10.32                80
 09/17/2021   10:13:49   (   0.38,-128.07) (   0.52,-128.57)   57.22                80
 09/18/2021   09:57:32   (   0.39,-128.05) (  -0.55,-123.98)  464.03                80
 09/19/2021   22:16:26   (  -0.37,-127.97) (  -0.67,-129.18)  138.62                80
 09/20/2021   22:00:09   (  -0.38,-127.95) (   0.40,-124.60)  382.55                80