Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/06/2021   10:16:07   (  -0.14,-128.31) (   0.21,-129.91)  182.49                80
 03/07/2021   09:54:30   (  -0.14,-128.32) (  -0.80,-125.32)  341.13                80
 03/08/2021   22:16:07   (   0.13,-128.37) (  -0.37,-130.54)  247.28                80
 03/09/2021   21:59:50   (   0.13,-128.38) (   0.65,-125.95)  276.87                80
 03/11/2021   10:21:18   (  -0.11,-128.37) (   0.49,-131.13)  314.76                80
 03/12/2021   09:59:40   (  -0.12,-128.38) (  -0.52,-126.54)  208.65                80
 03/13/2021   22:21:18   (   0.11,-128.42) (  -0.64,-131.76)  380.81                80
 03/14/2021   22:05:00   (   0.12,-128.43) (   0.38,-127.17)  143.19                80
 03/16/2021   10:26:28   (  -0.10,-128.42) (   0.77,-132.36)  447.91                80
 03/17/2021   10:04:51   (  -0.11,-128.43) (  -0.24,-127.77)   75.07                80
 03/19/2021   22:10:11   (   0.10,-128.46) (   0.12,-128.40)    7.15                80