Thus a planetary transit does not require, or imply, an ascendant (and thus no house system). But aspects between planets, and thus planetary transits, depend only on the motion of the planets along the ecliptic as viewed from the Earth (or the Sun). The reason that none of these four programs involve an ascendant, or astrological houses, is that the ascendant (and thus any house system) depends on a geographical position (usually a birthplace). Most astrological software is geocentric, but astro‑trading programs often use a heliocentric zodiac. In geocentric astrology the solar system and the zodiac are viewed from the perspective of the Earth, whereas in heliocentric astrology they are viewed from the perspective of the Sun. They are mostly described here as if they were merely astrological, but they are also useful in the areas of astro‑trading and astronomy. The programs on this website are based on exact astronomical algorithms developed by astronomers. Heliocentric Planetary Aspects and Transits. Please visit our Software Shop to see software available. World and personal planetary transits, and synastry Calculation of geocentric and heliocentric planetary positions, planetary aspects,
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