In: Physics
Describe how the motion of a planet (like Mars) among the stars of the zodiac on the sky is qualitatively different from the motion of an object like our Sun among the stars of the zodiac.
Describe the two hypotheses as to the origin or reason for the Sun’s motion relative to the stars of the Zodiac, first the self-centered view then the more modern less self- centered hypothesis.
1. The motion of the planet (like Mars) among the stars of the zodiac on the sky is qualitatively different from the motion of object like Sun because the zodiac signs are nothing but the different phases of distance in the orbit of a planet, that led to the origin of Modern Astronomy. While the Sun as the centre which labelled as the locus of all zodiac periods or phases.
2. The two hypotheses to the origin/reason for the Sun's motion relative to the stars of the zodiac, first:
The self-centred view: As the observations were taken from the planet or earth as per zodiac signs or periods (refer the figure below) the Sun seems to be in relative motion to the planet.
and the modern less self-centred hypotheses is due to modern orbit observations that Sun is not in motion relative to any planet but constant to its position but relatively moving with respect to the Milkyway galaxy.