In my 30 years of practice, I have found that the horary calculator is one of the most misunderstood tools in astrology. Many students ask me: "Can I just plug in a question and get a yes or no?" The answer is yes—but only if you know how to interpret the chart correctly. A horary calculator casts a chart for the moment a question is asked, and classical rules determine the outcome. This article will show you how to use a horary calculator to get reliable yes/no answers, following the tradition of William Lilly and Guido Bonatti.
What Is a Horary Calculator?
A horary calculator is a software or online tool that generates a horary chart based on the current time and location when a question is posed. Unlike natal astrology, horary is radical: the chart itself is the answer. The calculator does the math—calculating house cusps, planetary positions, and aspects—but the judgment rests on you. To get a clear yes/no, you must apply classical rules: the question must be sincere, the chart must be radical (i.e., the Ascendant must be within 3 degrees of a sign cusp or the Moon not void of course), and the significators must be well-placed.
How to Judge Yes/No with a Horary Calculator
Step 1: Determine the Significators
Every question has a querent (the person asking) and a quesited (the thing asked about). The querent is always represented by the ruler of the 1st house (Ascendant). The quesited is represented by the ruler of the house that rules the matter. For example, in a question about love, the 7th house rules the partner; for money, the 2nd house. The horary calculator shows you these rulers. Write them down.
Step 2: Check Aspect and Reception
A yes answer typically requires an applying aspect (within orb) between the querent's ruler and the quesited's ruler, with good reception (the quesited's ruler is in the dignities of the querent's ruler, or vice versa). Avoid separating aspects—they indicate the matter has passed. Also check if the Moon, as co-significator of the querent, makes an applying aspect to the quesited's ruler. If both rulers are in mutual reception by dignity, that is a strong yes.
Step 3: Avoid Common Pitfalls
Not every chart is answerable. If the Ascendant is early (0-3 degrees) or late (27-30 degrees), the question is premature or too late. If the Moon is void of course (no applying aspects before leaving its sign), the matter will come to nothing. The horary calculator will show these conditions—do not proceed if they are present. Also, if the ruler of the 1st or 7th is in the 6th, 8th, or 12th house, the outcome is often negative or delayed.
Practical Example: A Yes/No Question
Suppose you ask: "Will I get the job?" The horary calculator casts the chart. The 1st house ruler (you) is Mars in Aries in the 10th house. The 10th house ruler (career) is Saturn in Capricorn in the 6th house. Mars and Saturn are in trine (applying), and Mars is in the exaltation of Saturn (Aries is Saturn's fall, but here Mars is in its own sign—reception is mixed). However, Saturn is in the 6th house (sickness, servitude), which weakens the job. The Moon is applying to a square with Venus (ruler of the 6th). The judgment: a weak yes, but with difficulties. The calculator gave the raw data; you applied the rules.
Practical Takeaway
- Always verify radicality: Check the Ascendant degree and Moon's void-of-course status before interpreting. A non-radical chart yields no reliable answer.
- Focus on applying aspects: Only applying aspects between significators count. Separating aspects mean the matter is past or fading.
- Consider reception: Mutual reception by dignity (exaltation, triplicity, term, face) strengthens a yes. No reception weakens it.
- Use the Moon as tiebreaker: If the main rulers are inconclusive, the Moon's next aspect to a planet can indicate the outcome.