Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/14/2021   10:04:41   (   0.06,-128.14) (  -0.11,-127.31)   94.50                80
 05/16/2021   22:10:00   (  -0.06,-128.14) (  -0.01,-127.94)   23.40                80
 05/19/2021   10:12:30   (   0.07,-128.26) (   0.10,-128.53)   30.19                80
 05/20/2021   09:50:52   (   0.07,-128.28) (  -0.88,-123.93)  494.91                80
 05/21/2021   22:12:28   (  -0.07,-128.24) (  -0.27,-129.15)  103.26                80
 05/22/2021   21:56:11   (  -0.07,-128.26) (   0.77,-124.56)  421.92                80
 05/24/2021   10:17:38   (   0.07,-128.36) (   0.40,-129.73)  157.36                80
 05/25/2021   09:56:01   (   0.06,-128.37) (  -0.65,-125.15)  366.87                80
 05/26/2021   22:17:37   (  -0.06,-128.31) (  -0.51,-130.36)  233.48                80
 05/27/2021   22:01:18   (  -0.06,-128.32) (   0.48,-125.76)  290.82                80