I have that book - I am not entirely convinced of the rationale.
Astronomically speaking Earth is just another planet revolving around the Sun. If Sun is the reference/constant, then its position on the Zodiac is none other than 0 deg Aries.
Calculating how the Zodiac itself unfolds around the Sun is another matter of contention. Tropical calculation doesn't apply, therefore it's Sidereal. If Sidereal then what Ayanamsa (in Vedic lingo) to use - since they are all made for geocentric use?
I accepted that for Heliocentric use Ayanamsa = Zero (same as Sidereal J2000) makes more sense than Lahiri, Fagan/Bradley, etc.
Last but not least: there are no Houses, no AC, no IC and no MC in Heliocentric. Current wisdom maintains that geocentric planetary/zodiac attributes have the same meaning in Helio and I accept that until I am given enough reasons not to.