Born on a date
On August 13 the Sun was in Leo in every one of the 151 years from 1900 to 2050.
Sun on August 13
151 of 151
years from 1900 to 2050 in which the Sun was in Leo at some point of August 13.
Over all births, the Sun in Leo occurs in 8.78% of simulated births, about 1 in 11; the most common of 12.
Sun in Leo
In Leo, the Sun expresses itself in a warm, open way.
Generic readingA generic description in the style of modern astrology, the same for everyone who has this placement. Not a prediction.
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Which sign
Which decan
How common the sign is overall
Each count is out of the 151 years examined.
Bars start at zero.Each bar is the share of the 151 years in which the Sun was in that decan (a ten-degree third of a sign) at some point of August 13. The years overlap: in some years the Sun is in two decans on this date.
An even split of the 12 signsBars start at zero.Over all simulated births, on any date of the year, not only August 13. Each entry also gives the years, out of 151, in which the Sun was in that sign at some point of August 13. Share of 2,000,000 simulated births (1950–2024), tropical zodiac.
Sun in Leo
22 Jul 2026 → 23 Aug 2026 · about 31 days
last pass
Sun in Leo
23 Jul 2027 → 23 Aug 2027 · about 31 days
next pass
As of 16 October 2026, 13:57 UTC. Dates are UTC, tropical zodiac, read from the ephemeris's table of sign entries. This page refreshes hourly.
The Moon moves no more than about 16 degrees a day, so within one date it is in one sign or, when it crosses a boundary, two. Which signs depends on the year: across 1900–2050 the Moon was in each sign on August 13 in the number of years below.
Bars start at zero.Counts overlap: a year in which the Moon changes sign during the date counts for both signs. UTC dates.
AI-written text that an AI research review then checked against sources. No person has reviewed it; the notes and references behind each check are under its label.
The Sun in Leo is in domicile, the planet's own home, and the tradition lists no other planet's rulership here. Leo is a masculine, fixed fire sign; the Sun is a masculine, day-team planet, so sect, gender and sign agree.
Leo is the fifth sign of the zodiac, a fixed fire sign with positive polarity, and the only sign the Sun governs in traditional astrology.
Read the full Sun in Leo pageThe whole reading, its sources and how it was checked.
The astrology of the Greek-speaking Mediterranean from roughly the 1st century BCE to the 7th century CE, as recorded by authors such as Vettius Valens, Dorotheus and Ptolemy.
1 Oct 2026
The third decan of Leo covers 20° to 30°. Firmicus Maternus gives its face ruler, in the Chaldean order, as Mars, the planet that follows Jupiter in the slowest-to-fastest sequence. Medieval authors rank a face as the lowest dignity, so Mars here counts as a minor link rather than a strength. Mars is a malefic, a planet the tradition treats as difficult in nature, and it has no dignity in Leo. It belongs to the night team, while the Sun, the planet that rules Leo, is on the day team; that sorting is called sect. Leo is a masculine, fixed fire sign. Later practice reads the face after the major dignities, so it adds little to a planet placed here.
Sources
What was checked
An AI research review checked this text against sources on 1 Oct 2026. No person has reviewed it.
Reviewer's notes
Face ruler matches Firmicus Mathesis II.4 and the project's Chaldean decan table. Original claim that Hellenistic astrologers rank a face lowest was wrong (Firmicus equates a planet in its own decan with domicile; the ranking is medieval), so the text now attributes by author. Brennan's coverage of decans was not independently opened; existence of the 2017 book confirmed.
Sources consulted
The 20th-century Western approach shaped by Alan Leo, Dane Rudhyar and Liz Greene, drawing on Jungian psychology.
1 Oct 2026
The third decan of Leo covers 20°–30° of the sign, and a decan is a ten-degree third of a sign. In the modern triplicity convention it takes the third fire sign, Aries, as its sub-sign. Modern psychological astrology reads this as Leo's fixed fire sharpened by Aries' cardinal initiative. Modern readings associate the decan with decisiveness and a more combative display of self-confidence, along with impatience when recognition is slow. The tension described is between sustaining a position and starting a new one. The Chaldean order that Hellenistic astrologers use for faces gives this decan to Mars, so the two schemes land on related themes by different rules. The modern convention assigns by element, where the older scheme assigns by orbital order.
Sources
What was checked
An AI research review checked this text against sources on 1 Oct 2026. No person has reviewed it.
Reviewer's notes
Verified against the reference data: Leo 3 sub-sign is Aries; the Chaldean face is Mars. Removed 'a later system' as unconfirmed, since the same-element method appears in Indian texts of late antiquity. Sources: Brennan removed because a review states his book does not cover decans; Arroyo kept on the strength of a library record listing decans, so the modern reading is attributed to modern readings in general, not to his text.
Sources consulted
The astrology of the Greek-speaking Mediterranean from roughly the 1st century BCE to the 7th century CE, as recorded by authors such as Vettius Valens, Dorotheus and Ptolemy.
1 Oct 2026
Leo's second decan covers 10° to 20° of the sign. Firmicus Maternus gives its face ruler, in the Chaldean order, as Jupiter, a benefic, a planet the tradition treats as supportive by nature. Leo's domicile lord, the planet that rules the sign, is the Sun. Jupiter follows Saturn, the first decan's face ruler, in the slowest-to-fastest sequence. Jupiter has no dignity of its own in Leo, so this face is a small, borrowed link. Jupiter and the Sun are both day-team planets under sect, the tradition's sorting of planets into day and night teams. In Dorotheus' triplicity scheme, which names lords for each element's three signs, Jupiter rules the fire signs by night and the Sun by day. That is a second thread between the planets. Leo is masculine, fixed and fire.
Sources
What was checked
An AI research review checked this text against sources on 1 Oct 2026. No person has reviewed it.
Reviewer's notes
Face ruler matches Firmicus Mathesis II.4 and the project's Chaldean decan table. Original claim that Hellenistic astrologers rank a face lowest was wrong (Firmicus equates a planet in its own decan with domicile; the ranking is medieval), so the text now attributes by author. Brennan's coverage of decans was not independently opened; existence of the 2017 book confirmed. Dorotheus cited only for the triplicity lords, which were confirmed.
Sources consulted
The 20th-century Western approach shaped by Alan Leo, Dane Rudhyar and Liz Greene, drawing on Jungian psychology.
1 Oct 2026
The second decan of Leo covers 10°–20° of the sign, and a decan is a ten-degree third of a sign. The modern triplicity convention, also found in Vedic drekkana, assigns the next fire sign, Sagittarius, as its sub-sign. Modern psychological astrology reads this as Leo's warmth and fixed purpose shaded by Sagittarius' appetite for meaning, travel and candid talk. Modern readings describe a broader and more restless expression than the first decan, with generosity directed at ideas as well as people. The tension described is between loyalty to a chosen position and the mutable pull to move on. In the Chaldean order that Hellenistic astrologers use for faces, this decan falls to Jupiter. The modern scheme reaches Sagittarius, by element, where the older one reaches the planet Jupiter.
Sources
What was checked
An AI research review checked this text against sources on 1 Oct 2026. No person has reviewed it.
Reviewer's notes
Verified against the reference data: Leo 2 sub-sign is Sagittarius (the next fire sign); the Chaldean face is Jupiter. Hellenistic-era use of a same-element variant is reported in secondary sources, so the text keeps the scheme labelled modern and does not claim it is absent from antiquity. Sources: Brennan removed because a review states his book does not cover decans; Arroyo kept on the strength of a library record listing decans, so the modern reading is attributed to modern readings in general, not to his text.
Sources consulted