Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/28/2021   10:17:33   (   0.37,-127.65) (   0.99,-130.36)  309.02                80
 01/29/2021   09:55:56   (   0.35,-127.62) (  -0.07,-125.79)  209.25                80
 01/30/2021   22:20:13   (  -0.39,-127.61) (  -1.16,-130.99)  385.22                80
 01/31/2021   21:58:36   (  -0.37,-127.58) (  -0.10,-126.41)  132.95                80
 02/02/2021   10:22:43   (   0.40,-127.47) (   1.32,-131.58)  468.81                80
 02/03/2021   10:01:06   (   0.38,-127.43) (   0.31,-126.99)   49.03                80
 02/05/2021   22:06:26   (  -0.41,-127.37) (  -0.49,-127.62)   29.25                80
 02/06/2021   21:44:49   (  -0.39,-127.32) (   0.57,-123.04)  488.32                80
 02/08/2021   10:08:57   (   0.43,-127.20) (   0.64,-128.21)  114.73                80
 02/09/2021   09:47:19   (   0.41,-127.15) (  -0.37,-123.62)  402.33                80
 02/10/2021   22:11:36   (  -0.44,-127.12) (  -0.81,-128.83)  194.55                80