Half the traditional orb of a planet. The orb of a planet is the diameter of an imaginary sphere of light surrounding the planet. The moiety is the radius of that sphere. The sum of the moieties of two planets gives the maximum orb of an aspect between two planets. Modern astrology assigns orbs for convenience; traditional moieties were specific. It is assigned moieties to the planets as follows: Sun, 8.5?°; Moon, 6.25?°; Mercury, 3.5?°; Venus, 4?°, Mars, 3.75?°, Jupiter, 6?°; and Saturn, 5?°. Modern astrologers refer to the sum of the moieties as the orb of an aspect.