Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/04/2021   09:54:22   (   0.05,-127.80) (  -0.62,-124.88)  332.32                80
 05/05/2021   22:15:58   (  -0.06,-127.81) (  -0.59,-130.08)  260.33                80
 05/06/2021   21:59:41   (  -0.05,-127.85) (   0.50,-125.51)  267.07                80
 05/08/2021   10:21:09   (   0.06,-127.96) (   0.65,-130.69)  310.77                80
 05/09/2021   09:59:32   (   0.05,-127.99) (  -0.38,-126.10)  215.69                80
 05/10/2021   22:21:07   (  -0.05,-127.99) (  -0.83,-131.30)  378.63                80
 05/11/2021   22:04:51   (  -0.05,-128.03) (   0.27,-126.73)  148.17                80
 05/13/2021   10:26:19   (   0.05,-128.14) (   0.88,-131.91)  429.75                80
 05/14/2021   10:04:42   (   0.04,-128.17) (  -0.16,-127.33)   95.96                80
 05/16/2021   22:09:59   (  -0.04,-128.17) (  -0.02,-127.94)   25.58                80