Astrology is a complex art and science which applies symbolic meaning to astronomical information as it existed over two thousand years ago when the practice of astrology was first documented in writing by ancient astronomers and astrologers.
Western astrologers use the ancient positions of the constellations and Sidereal (aka Vedic or Hindu) astrologers use current astronomical positions. The two systems are very different, but work equally well.
Astrologers begin by erecting a natal chart, or horoscope, based on the date, time, and place you were born. Today, most charts are done on a computer which makes them very accurate. But, they are only as accurate as the information you provide. Any reputable astrologer will advise you to obtain more accurate birth information or to have your chart rectified if you only know that you were born “around 5 p.m.”
Read more here https://vocal.media/longevity/an-introduction-to-astrology
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