Air: Associated with thought; it's one of the four elements.

Astrology: The study of the planets and how they influence people and their personalities.

Birthchart: Chart that shows the positions of the planets, sun and moon at the time, date and place of birth.

Cardinal: Associated with inituition; it's one of the elements.

Celestial Sphere: An imaginary sphere around Earth used to map the positions of the Sun, Stars, Planets and Earth.

Earth: Associated with reality; it's one of the four elements.

Ecliptic: Marks the point where Earth's orbital plane intersects the celestial sphere.

Element: Represents characteristics that are associated with certain zodiac signs.

Equinox: Point at which the ecliptic crosses the Earth's equator.

Fire : Associated with activity and one of the four elements.

Fixed: Associated with stability and one of the four elements.

Horoscope: Birthchart according to time, date and place of birth.

Mutable: Associated with harmony and is one of three qualities.

Opposite Signs: Zodiac signs that are opposite each other on the zodiac wheel.

Planets: Eight major orbs moving around the Sun excluding Earth but Sun and Moon are sometimes also referred to as planets.

Quality: The behaviour associated with certain zodiac signs.

Rising Sign: Sign of the zodiac on the eastern horizon at time of birth.

Ruling Planet: Planet that influences a certain zodiac sign.

Solstice: Point at which the Sun is furthest south or north from Earth's equator.

Star Sign: Common misnomer for Sun sign.

Water: Associated with emotion and is one of the four elements.

Zodiac: Imaginary band divided into twelve segments of 30 degrees.

Zodiac Characteristics: Group of Characteristics associated with a certain sign.

Zodiac Constellation: Using sidereal time the zodiac is aligned to thirteen constellations.

Zodiac Lunar: Using moon cycles the zodiac is aligned to thirteen lunar months.

Zodiac Signs: Twelve 30-degree segments of the zodiac numbered anticlockwise according to positions at spring equinox.

Zodiac Wheel: The wheel is divided into twelve equal sections of 30 degrees and named after groups of stars.