Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/04/2021   22:13:16   (  -0.21,-128.23) (  -0.47,-129.51)  144.92                80
 01/05/2021   21:51:40   (  -0.18,-128.22) (   0.59,-124.93)  376.00                80
 01/07/2021   10:15:47   (   0.22,-128.16) (   0.68,-130.09)  220.12                80
 01/08/2021   09:54:11   (   0.20,-128.15) (  -0.38,-125.51)  300.57                80
 01/09/2021   22:18:27   (  -0.25,-128.17) (  -0.83,-130.72)  291.15                80
 01/10/2021   21:56:51   (  -0.23,-128.15) (   0.23,-126.14)  229.05                80
 01/12/2021   10:20:58   (   0.27,-128.08) (   1.03,-131.31)  368.30                80
 01/13/2021   09:59:21   (   0.25,-128.06) (  -0.04,-126.73)  151.75                80
 01/14/2021   22:23:38   (  -0.29,-128.07) (  -1.18,-131.94)  440.66                80
 01/15/2021   22:02:01   (  -0.27,-128.05) (  -0.12,-127.36)   79.27                80