Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/07/2021   10:15:47   (   0.22,-128.16) (   0.67,-130.09)  220.04                80
 01/08/2021   09:54:11   (   0.20,-128.15) (  -0.38,-125.51)  300.76                80
 01/09/2021   22:18:27   (  -0.25,-128.17) (  -0.83,-130.72)  290.31                80
 01/10/2021   21:56:51   (  -0.23,-128.16) (   0.23,-126.14)  229.97                80
 01/12/2021   10:20:59   (   0.27,-128.09) (   0.97,-131.32)  367.72                80
 01/13/2021   09:59:21   (   0.25,-128.07) (  -0.03,-126.73)  152.44                80
 01/14/2021   22:23:38   (  -0.29,-128.09) (  -1.19,-131.93)  439.33                80
 01/15/2021   22:02:01   (  -0.27,-128.07) (  -0.13,-127.36)   80.73                80
 01/18/2021   10:04:33   (   0.29,-127.97) (   0.26,-127.95)    3.54                80
 01/20/2021   22:09:53   (  -0.31,-127.97) (  -0.42,-128.58)   69.37                80