![Figure 4](geom.png)
Figure 4: Geometric definitions for the precessional motion of spinning compact binaries [54, 306].
We show (i) the source frame defined by the fixed orthonormal basis
; (ii) the instantaneous
orbital plane which is described by the orthonormal basis
; (iii) the moving triad
and the associated three Euler angles
,
and
; (v) the direction of the total
angular momentum
which coincides with the
–direction. Dashed lines show projections into
the
–
plane.
![{x, y,z }](article3009x.gif)
![{xℓ,yℓ,ℓ}](article3010x.gif)
![{n, λ, ℓ}](article3011x.gif)
![α](article3012x.gif)
![ι](article3013x.gif)
![Φ](article3014x.gif)
![J](article3015x.gif)
![z](article3016x.gif)
![x](article3017x.gif)
![y](article3018x.gif)