Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 6.  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   10:22:36   (   0.42,-128.24) (   0.96,-130.77)  287.61                80
 09/07/2021   10:06:17   (   0.42,-128.23) (  -0.05,-126.18)  234.85                80
 09/08/2021   22:25:12   (  -0.41,-128.17) (  -1.11,-131.38)  366.05                80
 09/09/2021   22:08:54   (  -0.42,-128.16) (  -0.11,-126.79)  156.01                80
 09/11/2021   10:27:41   (   0.41,-128.18) (   1.28,-131.96)  430.87                80
 09/12/2021   10:11:24   (   0.41,-128.17) (   0.21,-127.38)   90.85                80
 09/14/2021   22:14:01   (  -0.40,-128.07) (  -0.37,-127.99)    9.68                80
 09/17/2021   10:13:49   (   0.38,-128.06) (   0.52,-128.57)   58.03                80
 09/18/2021   09:57:32   (   0.39,-128.04) (  -0.54,-123.98)  463.17                80
 09/19/2021   22:16:27   (  -0.37,-127.96) (  -0.62,-129.19)  139.51                80