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The tropical zodiac follows the seasons, the sidereal zodiac the stars. Precession has pushed them about 24 degrees apart, enough to change most Sun signs.
The 24 solar terms are seasonal markers tied to Earth's orbit around the Sun, used as a farming guide in the lunar almanac.
Ophiuchus is not a 13th zodiac sign: the Sun crosses 13 IAU constellations, but Western astrology uses 12 equal 30 degree signs from the equinox.
Ptolemy's Tetrabiblos has four books setting out astrological principles, planetary influences, and why Ptolemy treated astrology as conjectural knowledge.
Cung hoàng đạo in English is zodiac signs. This covers the 12 sign names in English, their pronunciation, sign versus constellation, and translation notes.
Why Buddha's Birthday falls on the 8th or the 15th of the fourth lunar month, and how the Vietnam Buddhist Sangha holds Vesak Week each year.
Solar terms are 24 markers dividing the year by the Sun's position on the ecliptic, used in East Asian calendrics to determine seasons and festivals.
Discover the Moon Sign in astrology: its definition, how to calculate it, and how it differs from the Sun sign (the usual zodiac sign).
Tiểu Mãn, the 8th solar term, begins on 20 or 21 May when the Sun reaches 60 degrees longitude. In 2026 it starts at 07:28 on 21 May, Vietnam time.
Explore the Sextile aspect in astrology: a harmonious 60-degree angle symbolizing opportunity, hidden talents, and cooperation.
Cốc Vũ, the sixth solar term beginning 19 or 20 April, marks the rains that feed the rice. Its calculation, meaning and folk customs are explained.
Cung Hoàng Đạo is one of twelve equal divisions of the ecliptic, each tied to a constellation and used in Western astrology for personality, love and career.
Explore the meaning of the 9th house in astrology: life philosophy, travel, higher education, belief, and expansion of vision.
Jyotish, Indian astrology, uses the nine Navagraha, 27 Nakshatras and the sidereal zodiac, unlike Western astrology in reference frame and chart layout.
New Year's Day in Vietnam comes from the Gregorian calendar, adopted in the French colonial period, and later became an official public holiday.
Đại Hàn is the last of the 24 solar terms, at solar longitude 300 degrees and lasting about 15 days. Here its calculation, customs, and meaning are explained.
Lập Thu, tiết khí thứ 13, đánh dấu chuyển hạ sang thu. Bài giải thích cách tính ngày, ba hậu, gốc tích trong Tuế thời quảng ký và tục lệ.
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