How to quickly find 15-degree aspects


If your astrology software does not recognize aspects in increments of 15, do not despair!

Its simple. Just take the position of the planet/luminary and add 15° … Let’s use the chart of Louis Pasteur as an example.

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pasteur AA 2am chart

Pasteur’s Moon at 17GEM55 has been referred to as ‘unaspected’. Let’s see if there are any 15° aspects. Let’s round its figure up to 18° because it is so close. When we add 15° we get 33. Subtract 30 and that is 3° — which shows us that any 15 aspect will show up +/- 3° in any sign. (18 – 15 also = 3).

What lies 1-5°? Sun & Neptune, just short of 5° Capricorn, which is a 165° aspect (dubbed “Quindecile”).

We would use a tighter 1° orb for the 15° aspect, but an orb of 2° is certainly acceptable for obtuse angles (between 90 & 180), and I think also for the 75° & 105° aspects.

Counting in 15° increments from his Moon position, if Pasteur had anything at 1-4° Gemini or Cancer that would be an aspect of 15°.

If there were antyhing at ~18 Cancer or Taurus, of course, that would be a 30/semi-sextile.

3 Leo or Taurus = 45/semi-square.

18 Leo or Aries = 60/sextile.

3 Virgo or Aries = 75° aspect.

18 Virgo or Pisces = 90/square, of course.

3 Libra or Pisces = 105°.

18 Libra or Aquarius = 120/trine.

3 Scorpio or Aquarius = 135/sesquisquare.

18 Scorpio or Capricorn = 150/quincunx.

Now an opposition to the Moon would fall at 18 Sagittarius. Subtract 15 from that and you get 3 Saigittarius. Add 15 and you get 3 Capricorn. A 165/Qd qualifies for a 2° orb, so we look at 1-5°: Sun & Neptune are there, just short of 5°.

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About Kannon McAfee

Poet, healer, professional astrologer. I'm dedicated to advancing the science and art of astrology. My specialty is birth chart interpretation and rectification (for those with questionable charts or missing birth times). My focus is on helping people meet their purpose in life while understanding their options within that.
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