The Astrolium horary astrology calculator casts your horary chart for the moment you understood a sincere question and reads it by the classical method. Horary astrology, codified by William Lilly in Christian Astrology (1647), holds that the chart of the question contains the answer. The calculator stamps question time, casts in Regiomontanus, runs Lilly's 7 considerations before judgment, and routes significators in under 90 seconds.
The chart is radical or it is not, and the calculator tells you which with the classical reasoning underneath. The considerations come first because horary discipline depends on them: a chart with too many warnings is the practitioner being told to wait, not an invitation to force an answer.
This is the free preview. The full horary feature ships the question log with outcome tracking, perfection search to 90 days, and per-question house-system overrides. For the deeper reading method (Lilly, Cornelius, Frawley), read the horary astrology guide. For the related electional work, see electional astrology and the void-of-course Moon tool. For the $29 per month Pro plan, see pricing.
What the calculator returns
The output is structured as four blocks:
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The question chart. A Regiomontanus wheel showing all 7 classical planets, the Ascendant, the MC, and the relevant lots if you've checked the box. The chart legend names the system (Regiomontanus) and the location stamp to the minute.
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The radicality verdict. A panel of 7 checks: Ascendant in the first 3 degrees of a sign (too early), Ascendant in the last 3 degrees (too late), Moon void of course, Moon in via combusta (15 Libra to 15 Scorpio), Saturn in the 1st house, Saturn in the 7th house, and malefic in the 7th or lord of the 7th retrograde. Each check is green or red with the classical reasoning in a tooltip.
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Significators. Lord 1 (the querent's planet) is named with its sign, house, and condition. The Moon is named as co-significator. The quesited's planet is the lord of whichever house you selected: Lord 7 for relationship questions, Lord 10 for career, Lord 4 for real estate.
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The perfecting aspect. The next applying Ptolemaic aspect between the querent's significator and the quesited's significator within 30 days, with translation of light by the Moon flagged separately. If no perfection appears, the calculator says so explicitly; that is part of the answer.
How to use it
Type your question into the field. Stamp the moment you understood the question to the minute. Pick the question type from the dropdown (which routes the quesited's significator). Click cast.
The chart renders in 80 ms. Read the radicality panel first. If 4 or more checks are red, Frawley's strict reading says do not judge. The Lilly permissive reading lets you proceed with the caution recorded. Read the significators next. Read the perfecting aspect last. The chart tells the story; the radicality and significators are the grammar.
What horary actually is
William Lilly codified horary practice in Christian Astrology. The technique runs back to Dorotheus of Sidon and the Hellenistic period, and forward through medieval Arabic and Latin practice to the contemporary writers John Frawley and Geoffrey Cornelius.
Three claims define the technique. One: the moment of the sincere question contains the answer. Two: the chart is radical (fit to be read) only if certain conditions hold. Three: the significators meeting by applying aspect within the relevant time window means yes; them missing means no.
The classical strictness is the technique's discipline. A horary chart with 3 red considerations is not a horary chart; it is the astrologer being asked a question they cannot answer at this moment. The honest response is "ask again later." That discipline is what separates horary from chart-reading-with-questions. For the timing side of the same tradition — picking auspicious moments rather than reading questions — see the planetary hours calculator and the house systems guide.
Limits of the free calculator
The calculator runs 1 chart at a time and does not save the question or its outcome. The full horary feature ships the question log: every chart you cast sits next to its question and an outcome field that stays empty until the matter resolves. Filling in outcomes weeks or months later is the only honest way to refine horary judgement. The Pro plan keeps that record automatically.
The free calculator also limits the perfection search to 30 days forward. The full feature extends to 90 days, with stations and sign-changes flagged inside the search window.
Cross-link
For the full horary reading method with Lilly, Cornelius, and Frawley, read the horary astrology guide. For the question log and outcome tracking, see the horary feature. For the related electional work (designing a moment rather than reading one), see electional astrology. For the void-of-course Moon as a standalone check on any chart, see the dedicated tool. For the $29 per month Pro plan with unlimited horary charts, see pricing.