Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 9 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/13/2020   10:11:54   (  -0.10,-128.17) (   0.37,-130.35)  248.51                80
 09/14/2020   09:55:38   (  -0.10,-128.19) (  -0.65,-125.77)  276.03                80
 09/15/2020   22:17:16   (   0.11,-128.18) (  -0.52,-131.00)  320.41                80
 09/16/2020   21:55:40   (   0.11,-128.20) (   0.50,-126.41)  203.79                80
 09/18/2020   10:17:10   (  -0.11,-128.27) (   0.62,-131.61)  380.59                80
 09/19/2020   10:00:54   (  -0.11,-128.29) (  -0.40,-127.03)  143.59                80
 09/20/2020   22:22:32   (   0.11,-128.28) (  -0.76,-132.26)  453.34                80
 09/21/2020   22:00:56   (   0.11,-128.29) (   0.26,-127.68)   70.18                80
 09/24/2020   10:06:08   (  -0.12,-128.36) (  -0.10,-128.28)    8.30                80
 09/26/2020   22:08:51   (   0.13,-128.35) (   0.02,-128.94)   67.11                80