September Libra vs October Libra have different personalities. Know from astrologers what is the difference between September Libra vs October Libra Personalities. Libras are a sign ruled by Venus, the planet of love, romance, and beauty, and September Libras are completely under the influence of this planet. Libras born in October are usually second or third decan Libras, which means they have a planet affecting the way they express their Libra energy.