Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/25/2021   22:15:02   (  -0.35,-127.79) (  -0.82,-129.78)  226.74                80
 01/26/2021   21:53:26   (  -0.33,-127.76) (   0.24,-125.20)  291.83                80
 01/28/2021   10:17:33   (   0.37,-127.65) (   0.98,-130.37)  309.15                80
 01/29/2021   09:55:55   (   0.35,-127.62) (  -0.03,-125.78)  209.05                80
 01/30/2021   22:20:13   (  -0.39,-127.61) (  -1.14,-130.99)  385.90                80
 01/31/2021   21:58:35   (  -0.37,-127.57) (  -0.14,-126.40)  132.19                80
 02/02/2021   10:22:43   (   0.40,-127.46) (   1.35,-131.57)  469.47                80
 02/03/2021   10:01:06   (   0.39,-127.42) (   0.28,-127.00)   48.22                80
 02/05/2021   22:06:26   (  -0.41,-127.35) (  -0.45,-127.62)   30.40                80
 02/06/2021   21:44:49   (  -0.39,-127.31) (   0.56,-123.03)  486.99                80