Orb
Orb is the acceptable deviation from an aspect's exact degree value. For example, a conjunction with a 5° orb is valid within ±5° of 0°.
Related Terms
Placidus House System
The most commonly used house system. House boundaries have unequal degrees and are sensitive to latitude differences.
Degree
The unit of measurement for determining positions on the zodiac circle. The 360° circle is divided into 12 signs of 30° each. Each degree can carry individual meaning.
Whole Sign Houses
One of the oldest house systems. A simple and effective system where each entire sign corresponds to one house. Common in Hellenistic astrology.
Ephemeris
An astronomical table showing the daily positions of planets. The fundamental reference source for astrologers' chart calculations.
IC (Nadir)
The lowest point of the chart, opposite the MC. The point representing roots, home, family, and your most private inner world.
Lunar Phases
The Moon's cycle consisting of New Moon, Crescent, First Quarter, Gibbous, Full Moon, Disseminating, Last Quarter, and Balsamic Moon phases.