Online Star Maps

Astro e-Calendar

The Basics of Stargazing

Stargazing Manner

Astronomical Event

Chinese Starlore

Zodiacal Constellations

Astro-photography

Glossary


Important notices





Which constellation do you belong to? Do you know that since these constellations are located in the Zodiac, the path of the Sun in the sky, therefore they are collectively called Zodiacal Constellations? On your birthday, the Sun has just travelled past your constellation. Yet, things have changed over the past 2,000 years or so.

The celestial phenomenon witnessed now is not the same as 2,000 years ago. Since the earth's axis actually sweeps out a cone with a period of about 26,000 years, the position of the Zodiac in the sky changes accordingly. As a result, the arrival time of the Sun at the same constellation will be delayed for about one month every 2,000 years or so. Furthermore, a thirteenth constellation, Ophiuchus, is also in the Zodiac now. Using the diagram on the left, you can compare the present constellations the Sun passes by on your birthday with the traditional ones.

enlarge