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Under the tropical zodiac, the Sun enters Libra on the moment of autumnal equinox by definition, or around September 22, leaving it around October 24.
Libra, symbolised by a pair of scales, has an ideal of peace, balance and harmony in all life. A pity reality rarely matches this ideal for long. The desire for relationship is strong, but like all air signs Libra has a problem with the emotional complexities therein.