Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2020   10:17:17   (   0.01,-127.94) (   0.62,-130.66)  310.84                80
 12/02/2020   09:55:40   (  -0.01,-127.96) (  -0.43,-126.08)  213.80                80
 12/03/2020   22:19:58   (  -0.02,-128.00) (  -0.74,-131.30)  376.32                80
 12/04/2020   21:58:21   (  -0.00,-128.02) (   0.31,-126.72)  147.68                80
 12/06/2020   10:22:30   (   0.03,-128.04) (   0.92,-131.90)  440.00                80
 12/07/2020   10:00:53   (   0.01,-128.06) (  -0.13,-127.32)   84.00                80
 12/09/2020   22:03:34   (  -0.03,-128.11) (   0.02,-127.96)   17.07                80
 12/12/2020   10:08:46   (   0.05,-128.14) (   0.16,-128.55)   48.31                80
 12/13/2020   09:47:09   (   0.03,-128.15) (  -0.88,-123.98)  474.96                80
 12/14/2020   22:11:26   (  -0.07,-128.17) (  -0.32,-129.19)  116.57                80