Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/23/2021   10:12:22   (   0.33,-127.82) (   0.65,-129.15)  151.96                80
 01/24/2021   09:50:46   (   0.31,-127.79) (  -0.42,-124.57)  366.93                80
 01/25/2021   22:15:02   (  -0.35,-127.79) (  -0.82,-129.78)  226.93                80
 01/26/2021   21:53:26   (  -0.33,-127.76) (   0.25,-125.20)  291.58                80
 01/28/2021   10:17:33   (   0.37,-127.65) (   0.98,-130.37)  309.41                80
 01/29/2021   09:55:57   (   0.35,-127.62) (  -0.09,-125.79)  208.75                80
 01/30/2021   22:20:13   (  -0.39,-127.60) (  -1.15,-130.99)  386.33                80
 01/31/2021   21:58:36   (  -0.37,-127.57) (  -0.09,-126.42)  131.69                80
 02/02/2021   10:22:44   (   0.40,-127.46) (   1.31,-131.58)  470.01                80
 02/03/2021   10:01:06   (   0.39,-127.41) (   0.30,-126.99)   47.64                80
 02/05/2021   22:06:26   (  -0.41,-127.35) (  -0.47,-127.62)   31.11                80