The Sun is the centre and ruler of the Solar System. The sun is the life-giver as it sends out energy and light to all the planets. Without this energy, all life as we know it would cease.
The Sun to the positive aspects, radiates material energies to create change. The energies of the Sun will seemingly magnify the energies of any celestial object in opposition to the position of our home planet, the Earth. Meaning quite simply, that when the Sun is in a constellation, the energies of that constellation will be intensified, so that people born of the same Sun Sign will be more likely to resonate with these aspects more than other individuals.
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