Denebola

latin: Denebola · arabic: dhanab al-asad (ذنب الأسد) · egyptian: Sedef (sd.f, 'his tail')

Definition

Denebola is the beta star of the constellation Leo, designated Beta Leonis, marking the tail of the Lion. The Arabic name dhanab al-asad (ذنب الأسد, 'tail of the lion') describes the star's place on the figure. In the Egyptian astronomical tradition the star corresponds to Sedef (sd.f, 'his tail'), an hourly star in the Ramesside star tables paired with Tep-en-Mai (Regulus) as the head of the Mai-Lion constellation; in the Arabic Manazil al-Qamar tradition Denebola serves as the indicator star for Mansion 12 Al-Sarfah ('The Changer').

In Tradition

Across the Egyptian, Hellenistic, and Arabic-Persian transmission lineages Denebola anchors the tail of the Lion-figure with cross-tradition naming continuity: Egyptian Sedef (sd.f) = Arabic dhanab al-asad = Latin Denebola, all naming the same locational role. Al-Biruni records Denebola as one of the nebulous-star degrees 'injurious to the eyes' at 5°-7° Virgo in his Tafhim catalog; Warnock fixes the star as the indicator for Mansion 12 with Ptolemy's Saturn-Venus complexion for the bright star in Leo's tail.

In Practice

Practitioners use Denebola in multiple reading-frames. As an indicator star, the precessed longitude marks the leading boundary of Lunar Mansion 12 Al-Sarfah; Warnock fixes the 2019 position at 21° Virgo 52'. As a per-star fixed star, the star is read by direct longitudinal conjunction-aspect to natal points under Ptolemy's Saturn-Venus complexion. As an injurious-degree star, Al-Biruni's Tafhim §460 places Denebola among the degrees 'injurious to the eyes' at 5°-7° Virgo. As a constellational anchor, the Egyptian Sedef identification preserves the star as the tail of the Mai-Lion across the New Kingdom Ramesside tables, the Roman-period Heter coffin (AD 125), and the modern reception. Crane's modern zodiacal-fixed-stars reference table gives the J2000 position 21° Virgo 37'; Dykes Appendix D gives 23° Leo 09' for the Persian-Arabic reference framework. The star's near-ecliptic latitude makes longitudinal conjunction-aspect the practical reading.

Historical Origin

Denebola is attested in the Egyptian Ramesside star tables (New Kingdom c. 1200-1100 BCE) as Sedef (sd.f), the hourly star paired with Tep-en-Mai (Regulus) per Belmonte-Lull 2018; in Al-Biruni's Tafhim §460 (1029 CE) as a nebulous-degree star at 5°-7° Virgo; in Masha'allah's Book of Aristotle III.1 fixed-star configurations (Dykes 2009 trans.) and Dykes Appendix D 27-star table; in the Arabic Manazil al-Qamar Mansion 12 Al-Sarfah scheme compiled by Warnock 2019.

Etymology

Origin: Arabic. Meaning: From Arabic dhanab al-asad (ذنب الأسد), 'tail of the lion'; the same naming-role is preserved by the Egyptian Sedef (sd.f, 'his tail') in the Ramesside tables — a cross-tradition naming continuity for the star's place on the Lion-figure..

Definition

In Tradition

In Practice

Historical Origin

Etymology

Further Reading