Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 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)
 12/04/2020   21:58:21   (  -0.00,-128.02) (   0.28,-126.72)  148.28                80
 12/06/2020   10:22:30   (   0.03,-128.04) (   0.88,-131.90)  439.57                80
 12/07/2020   10:00:54   (   0.01,-128.06) (  -0.16,-127.33)   84.49                80
 12/09/2020   22:03:34   (  -0.03,-128.12) (  -0.00,-127.95)   18.23                80
 12/12/2020   10:08:46   (   0.05,-128.14) (   0.12,-128.56)   47.18                80
 12/13/2020   09:47:10   (   0.03,-128.16) (  -0.93,-123.98)  476.19                80
 12/14/2020   22:11:26   (  -0.07,-128.18) (  -0.28,-129.19)  114.83                80
 12/15/2020   21:49:50   (  -0.05,-128.19) (   0.78,-124.61)  407.93                80
 12/17/2020   10:13:58   (   0.09,-128.19) (   0.46,-129.79)  182.37                80