Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/06/2021   10:22:35   (   0.42,-128.24) (   1.01,-130.76)  287.76                80
 09/07/2021   10:06:17   (   0.42,-128.23) (  -0.05,-126.18)  234.65                80
 09/08/2021   22:25:12   (  -0.41,-128.17) (  -1.16,-131.37)  366.30                80
 09/09/2021   22:08:54   (  -0.42,-128.15) (  -0.10,-126.79)  155.72                80
 09/11/2021   10:27:41   (   0.41,-128.18) (   1.27,-131.96)  431.28                80
 09/12/2021   10:11:23   (   0.41,-128.17) (   0.26,-127.37)   90.40                80
 09/14/2021   22:14:01   (  -0.40,-128.06) (  -0.35,-127.99)    9.57                80
 09/17/2021   10:13:50   (   0.38,-128.06) (   0.51,-128.57)   58.68                80
 09/18/2021   09:57:31   (   0.39,-128.04) (  -0.50,-123.97)  462.41                80