As an Astrologer, I get hundreds of PM/DM on my social media every month on horoscope compatibility. My followers and astrology enthusiast are always excited to know if their horoscope is compatible with a specific person – a friend, their significant other, crush, boss, colleagues, family members, etc.
Technically, you would need a person’s full birth details (birth time, date and location) to look at an individual’s entire birth chart and do a synastry (compatibility) chart reading to know if you are genuinely compatible with that individual.
However, with the main horoscope sign or Sun sign alone, you would be able to tell a person’s motivation, ego, higher purpose, how they portray themselves in the public sphere and if their values are in alignment with your values.
Personally, using this technique to analyse the people around me helped me build rapport with clients when I was working in corporate (I was in Advertising for 10 years before I made a career switch).
In astrology, the 12 horoscope signs are grouped into four elements fire (Aries, Leo, Sagittarius), earth (Taurus, Virgo, Capricorn), air elements (Gemini, Libra, Aquarius) and water (Cancer, Scorpio, Pisces). As a general rule of thumb, fire elements are complementary to other fire signs and also air signs; air signs are favourable to fellow air signs and again fire signs; earth signs blend well with other earth signs, and water signs with other water signs and earth signs are good together.