The geocentric model , consistent with planetary parallax , was assumed to be an explanation for the unobservability of the parallel phenomenon , stellar parallax .
The geocentric model , consistent with planetary parallax , was assumed to be an explanation for the unobservability of the parallel phenomenon , stellar parallax .
The heliocentric model, inconsistent with planetary parallax, was assumed to be an explanation for the unobservability of the parallel phenomenon, stellar parallax.