Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2020   10:08:46   (   0.05,-128.16) (   0.11,-128.56)   45.29                80
 12/13/2020   09:47:10   (   0.03,-128.17) (  -0.94,-123.98)  478.46                80
 12/14/2020   22:11:26   (  -0.07,-128.21) (  -0.27,-129.19)  111.41                80
 12/15/2020   21:49:50   (  -0.05,-128.22) (   0.78,-124.61)  411.65                80
 12/17/2020   10:13:58   (   0.09,-128.22) (   0.44,-129.78)  178.80                80
 12/18/2020   09:52:22   (   0.07,-128.23) (  -0.61,-125.21)  344.35                80
 12/19/2020   22:16:38   (  -0.10,-128.26) (  -0.59,-130.42)  245.50                80
 12/20/2020   21:55:01   (  -0.08,-128.27) (   0.47,-125.84)  277.39                80
 12/22/2020   10:19:10   (   0.12,-128.26) (   0.76,-131.01)  313.53                80
 12/23/2020   09:57:33   (   0.10,-128.27) (  -0.30,-126.43)  209.50                80