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Star Almanack · Calendar

Natural Calendar

How many numbered calendar days does each astronomical zodiac month contain?

Aries 1 is the UTC calendar date on which the Sun reaches 0° tropical ecliptic longitude. Taurus 1 begins at 30°, and so on. Each zodiac month includes its first date and ends the day before the next ingress date. The year runs from Aries 1 to the next Aries 1. All ingress dates and calendar-day counts use UTC, without local time-zone or daylight-saving adjustments. A natural leap year has 366 numbered calendar days. Ingress times currently use an approximate solar-longitude series and have not been independently verified against a precision ephemeris; UTC dates near midnight may change after verification.

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