Androcles wrote:
Blackwell Synergy: Monthly Notices RAS, Vol 0, Issue 0: Sun's ...
"The Sun wobbles about the Solar system barycentre with the distance
varying up to two times its radius." - (RAS - Royal Astronomical
Society)

The sun is an irregular cepheid with a period of 4330 days when seen
from M31.

I see your knowledge of Cepheids is like your knowledge
of physics, Androcles. :-)

Paul