Horoscope Chart Dates

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Zodiac sign dates

These dates follow the tropical zodiac used in most Western astrology. Because the calendar year is not exactly the length of the Sun’s annual cycle, the day the Sun enters each sign can shift by a day from year to year.

Why sign dates vary by a day

The Sun takes about 365.24 days to return to the same point on the ecliptic, while calendar years are 365 or 366 days long. Leap years and time zones therefore move the exact moment of each sign change around by up to a day. For example, the Sun enters Aries at the March equinox, which falls on 19, 20 or 21 March depending on the year and your time zone. People born on these edge days are often said to be “on the cusp”; the calculator settles which side of the line your birth falls on.

Elements and modalities

How the calculator works

The calculator computes the Sun’s actual ecliptic longitude at your birth moment using astronomical formulas — the same approach astronomers use for solar positions, accurate to well under a degree for dates between 1800 and 2050. Each sign covers 30 degrees of longitude starting from 0° Aries at the March equinox. If you don’t know your birth time, noon is assumed, and the calculator warns you if the Sun changed sign during your birth date.

Worked example

Someone born on 23 August 1995 is on the Leo–Virgo boundary. With no birth time the calculator checks the whole day and reports that the Sun moved from Leo into Virgo during that date. Entering a birth time and UTC offset settles it: births after the change are Virgo, earlier ones Leo.

Sun sign, moon sign and rising sign

Your sun sign is only one part of a birth chart. Astrologers also look at the Moon’s sign, which changes every two to three days, and the rising sign (ascendant), which changes roughly every two hours and needs an exact birth time and place. Popular horoscopes are based on sun signs alone, which is why many people find them general.

Signs and the seasons

The tropical zodiac is tied to the seasons of the Northern Hemisphere. Aries begins at the March equinox, Cancer at the June solstice, Libra at the September equinox and Capricorn at the December solstice — the four cardinal signs. That is why these signs are called cardinal: each opens a season. In the Southern Hemisphere the seasons are reversed, but the zodiac dates stay the same.

Symbols and their origins

A note on astrology

Astrology is a cultural and symbolic tradition, not a science: studies have not found that zodiac signs predict personality or life events. The astronomy here is real — the Sun really was in that part of the sky — but the meanings attached to signs are traditional interpretations. Enjoy them for fun and reflection.

Tropical and sidereal zodiacs

Western astrology uses the tropical zodiac, tied to the seasons. Vedic (Indian) astrology uses the sidereal zodiac, tied to the background stars; because of the slow wobble of Earth’s axis (precession), the two differ today by about 24 degrees, so your sidereal sun sign is often the sign before your tropical one. The calculator uses the tropical system.