Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/08/2021   10:21:09   (   0.06,-127.95) (   0.69,-130.68)  311.13                80
 05/09/2021   09:59:31   (   0.06,-127.99) (  -0.34,-126.09)  215.21                80
 05/10/2021   22:21:07   (  -0.06,-127.98) (  -0.81,-131.31)  379.29                80
 05/11/2021   22:04:50   (  -0.05,-128.02) (   0.22,-126.72)  147.33                80
 05/13/2021   10:26:18   (   0.05,-128.13) (   0.92,-131.90)  430.95                80
 05/14/2021   10:04:41   (   0.05,-128.15) (  -0.11,-127.31)   94.66                80
 05/16/2021   22:10:00   (  -0.05,-128.15) (  -0.00,-127.94)   23.83                80
 05/19/2021   10:12:31   (   0.06,-128.28) (   0.11,-128.54)   29.47                80
 05/20/2021   09:50:53   (   0.05,-128.30) (  -0.93,-123.95)  495.49                80