Orb (astrology)
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In astrology
Astrology
Astrology consists of a number of belief systems which hold that there is a relationship between astronomical phenomena and events in the human world...

, the orb is how much an angle made by two points differs from the exactness of an aspect
Astrological aspect
In astrology, an aspect is an angle the planets make to each other in the horoscope, and also to the ascendant, midheaven, descendant, lower midheaven, and other points of astrological interest. Aspects are measured by the angular distance in degrees and minutes of ecliptic longitude between two...

. A trine
Trine
Trine may refer to:*Trine , an angle of 120° *Trine , a 2009 video game by Frozenbyte*Trine 2, the sequel to Trine*Trine University, an institution of higher education in Angola, Indiana...

, for instance, is 120 degrees. If two points were 123 degrees apart, they would be said to be in a trine with an orb of 3 degrees. It is generally held in astrological delineation that the larger the orb, the less powerful the aspect's effect is.

For example, if the sun is located in the sign Aquarius at 15 degrees and the moon is also going through Aquarius, then the moon's orb of influence will begin no earlier than 5 degrees Aquarius and will last no longer than 25 degrees Aquarius. However, this would be considered a wide orb. Most astrologers consider the orb of influence to be no more than 8 degrees on either side.

Larger orbs tend to be used for aspects
Astrological aspect
In astrology, an aspect is an angle the planets make to each other in the horoscope, and also to the ascendant, midheaven, descendant, lower midheaven, and other points of astrological interest. Aspects are measured by the angular distance in degrees and minutes of ecliptic longitude between two...

 involving major bodies, such as the sun or moon. Larger orbs also tend to be used for major aspects, such as conjunctions and oppositions.

Smaller orbs are sometimes used when an aspect
Astrological aspect
In astrology, an aspect is an angle the planets make to each other in the horoscope, and also to the ascendant, midheaven, descendant, lower midheaven, and other points of astrological interest. Aspects are measured by the angular distance in degrees and minutes of ecliptic longitude between two...

 is "out of sign". An "out of sign" aspect involves one that's a multiple of 30 degrees, meaning the two points should have the same positioning within their signs, however the orb causes the points to be in different signs than expected. For example, if the sun is located at 29 degrees
Anaretic degree
In astrology, the anaretic degree is the final degree of any sign, which is 29 degrees 0 minutes to 29 degrees 59 minutes. Some modern theorists include the last two degrees...

 Aries, and the moon is located at 1 degree Leo, the difference is 92 degrees, which makes a square aspect. However Aries and Leo are four signs or 120 degrees apart, so one might expect a trine aspect instead when just considering the signs involved.
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