Book of Nut (Fundamentals of the Course of the Stars)

Definition

The Book of Nut is an ancient Egyptian text about the sky: it describes how the sun and stars move through the year, told as a story about the goddess Nut, who arches over the earth as the body of the sky. Each evening she swallows the sun; through the night it travels inside her; at dawn she births it again. Along her body run the decans — the 36 star-groups the Egyptians used to mark the hours of night. The text's own ancient title is the Fundamentals of the Course of the Stars; "Book of Nut" is the modern nickname.

In Tradition

Egyptologists read the Book of Nut as the principal native-Egyptian work that ties cosmology, the calendar, and star-timekeeping into one frame. It mixes mythological description with practical astronomical tables — including decan lists and the mechanics of the sun's nightly passage — so that the religious image of Nut and the technical business of telling time are inseparable parts of a single text.

In Practice

The Book of Nut is one of our richest windows onto how the Egyptians themselves explained the sky. It survives in four main witnesses: the cenotaph of Sethy I at Abydos (19th Dynasty, roughly 1300 BCE, the earliest surviving copy), the tomb of Ramesses IV in the Valley of the Kings (20th Dynasty), and two Roman-period commentary papyri, Carlsberg I and Carlsberg Ia, written around AD 144 — nearly 1,500 years after the Sethy I version. That long gap matters: the Carlsberg papyri preserve a line-by-line commentary that helps modern scholars read the much older temple version. The text lays out the decans rising and setting through Nut's body across the year, names remote regions of the cosmos such as the primordial darkness at the top of the sky, and frames all of it as the daily and yearly journey of the sun. Neugebauer and Parker catalogued it as "the Cosmology of Seti I and Ramses IV"; von Lieven's 2007 study standardized the ancient title now in use.

Historical Origin

Earliest witness: the cenotaph of Sethy I at Abydos, 19th Dynasty (c. 1300 BCE); also in the tomb of Ramesses IV (KV 2, 20th Dynasty) and, most completely, in Papyrus Carlsberg I and Ia, c. AD 144 (first edited by Lange and Neugebauer, 1940). Catalogued by Neugebauer and Parker as "The Cosmology of Seti I and Ramses IV" in Egyptian Astronomical Texts (1960). The modern critical edition and standardized title Fundamentals of the Course of the Stars are due to Alexandra von Lieven (2007). Also in Clagett, Belmonte and Lull, and Brown.

Etymology

Origin: Egyptian. Meaning: snT Smt nt sbAw — "the fundamentals of the course of the stars".

Further Reading

• Otto Neugebauer & Richard A. Parker, Egyptian Astronomical Texts, Volume I: The Early Decans
• Alexandra von Lieven, Grundriss des Laufes der Sterne: Das sogenannte Nutbuch
• Marshall Clagett, Ancient Egyptian Science, Volume II: Calendars, Clocks, and Astronomy
• Juan Antonio Belmonte & José Lull, In Search of Cosmic Order: Selected Essays on Egyptian Archaeoastronomy