 
  
  
   
 
 
  If
   If   orbits become polarised
  orbits become polarised 
 
  Aligned with absolute reference frame
   Aligned with absolute reference frame 
 
  Assume CMB defines absolute reference frame
   Assume CMB defines absolute reference frame
  - Planetary data (Hellings 1984)
  - Planetary data (Hellings 1984) 
  - PSR B1855+09 (Damour &
Esposito-Farese 1992)
  - PSR B1855+09 (Damour &
Esposito-Farese 1992)
J2317+1439   - most circular orbit known
  - most circular orbit known
 
 - (Bell, Camilo & Damour 1996)