The Vocabulary
The technical words, explained at whichever depth you read in.
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Conjunction
Two planets sitting in the same place.
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Opposition
Two planets at opposite ends of the sky, facing each other across the circle.
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Square
Two planets a quarter of the way round from each other.
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Trine
Two planets a third of the way round the circle from each other.
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Sextile
Two planets a sixth of the way round from each other.
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Quincunx
Two planets at an awkward distance — not opposite, not square, just not fitting.
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Ascendant
The exact point of the sky that was climbing over the horizon in the east at the minute you were born.
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Midheaven
The highest point the sky reaches over your birthplace — straight up and slightly south.
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Lunar node
One of the two places where the Moon's path crosses the Sun's.
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Lilith
The far point of the Moon's orbit — the place where it is furthest from us.
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Orb
How far off exact an angle is allowed to be and still count.
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Retrograde
When a planet appears to go backwards through the signs.
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Declination
How far north or south of the celestial equator a planet is.
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Cusp
The line where one house ends and the next begins.
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House
One of twelve slices of your chart, each covering an area of life — money, work, home, and so on.
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Stellium
Three or more planets bunched together in one place.
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Dignity
Whether a planet is somewhere it finds easy or somewhere it finds hard.
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Tropical zodiac
The zodiac measured from the first day of spring.
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Sidereal zodiac
The zodiac measured from the stars themselves rather than from the seasons.
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Ayanamsa
The size of the gap between the two zodiacs — about twenty-four degrees at the moment, and slowly growing.