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astronomy

Ra

Ra is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ra rather than just read about it. In short: Ra (; Ancient Egyptian: 𓂋𓐰𓂝𓇳, romanized: rꜥ; also transliterated rꜥw, pronounced [ˈɾiːʕuw] ; cuneiform: 𒊑𒀀 ri-a or 𒊑𒅀ri-ia; Phoenician: 𐤓𐤏, romanized: rʿ) or Re (Coptic: ⲣⲏ, romanized: Rē) was the ancient Egyptian deity of the Sun. By the Fifth Dynasty, in the 25th and 24th centuries BC, Ra had become one of the most important gods in ancient Egyptian religion, identified primarily with the noon-day Sun.

Ra — main illustration
Ra — illustration

Key takeaways

  • Ra belongs to astronomy; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Ra to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Ra from memory before moving on to harder problems.

Reference excerpt

Ra (; Ancient Egyptian: 𓂋𓐰𓂝𓇳, romanized: rꜥ; also transliterated rꜥw, pronounced [ˈɾiːʕuw] ; cuneiform: 𒊑𒀀 ri-a or 𒊑𒅀ri-ia; Phoenician: 𐤓𐤏, romanized: rʿ) or Re (Coptic: ⲣⲏ, romanized: Rē) was the ancient Egyptian deity of the Sun. By the Fifth Dynasty, in the 25th and 24th centuries BC, Ra had become one of the most important gods in ancient Egyptian religion, identified primarily with the noon-day Sun. Ra ruled in all parts of the created world: the sky, the Earth, and the underworld. He was believed to have ruled as the first pharaoh of Ancient Egypt. He was the god of the Sun, order, kings and the sky. Ra was portrayed as a falcon and shared characteristics with the sky-god Horus. At times, the two deities were merged as Ra-Horakhty, "Ra, who is Horus of the Two Horizons". When the god Amun rose to prominence during Egypt's New Kingdom, he was fused with Ra as Amun-Ra. The cult of the Mnevis bull, an embodiment of Ra, had its center in Heliopolis and there was a formal burial ground for the sacrificed bulls north of the city. All forms of life were believed to have been created by Ra. In some accounts, humans were created from Ra's tears and sweat, hence the Egyptians call themselves the "Cattle of Ra". In the myth of the Celestial Cow, it is recounted how humankind plotted against Ra and how he sent his eye as the goddess Sekhmet to punish them.

Religious roles

Journey of the Sun According to Egyptian myth, when Ra became too old and weary to reign on Earth, he relinquished and went to the skies. As the Sun god, his duty was to carry the Sun across the sky on his solar barque to light the day. When the sun set and twilight came, he and his vessel passed through the akhet, the horizon, in the west, and traveled to the underworld. At times, the horizon has been described as a gate or door that leads to the Duat. There, he would have to sail on the subterrestrial Nile and crossed through the twelve gates and regions. Through the course of his underworld journey, he would transform into his Ram-headed form. Every night, Apophis would attack Ra in an attempt to stop the sun-boat's journey. After defeating the snake, Ra would leave the underworld, returning at dawn, lighting the day once again. He was said to have traveled across the sky in his falcon-headed form on the Mandjet Barque through the hours of the day, and then switch to the Mesektet Barque in his ram-headed form to descend into the underworld for the hours of the night.

Sun as a creator

The Sun is the giver of life, controlling the ripening of crops that were worked by man. Because of the life-giving qualities of the Sun, the Egyptians worshipped the Sun as a god. The creator of the universe and the giver of life, the Sun or Ra represented life, warmth and growth. Since the people regarded Ra as a principal god, creator of the universe and the source of life, he had a strong influence on them, which led to him being one of the most worshipped of all the Egyptian gods and even considered King of the Gods.

At an early period in Egyptian history, his influence spread throughout the whole country, bringing multiple representations in form and in name. The most common form combinations are with Atum (his human form), Khepri (the scarab beetle) and Horus (the falcon). The form in which he usually appears is that of a man with a falcon's head, which is due to his combination with Horus, another sky-god. On top of his head sits a solar disc with a cobra, which in many myths represents the Eye of Ra. At the beginning of time, when there was nothing but chaos, the sun-god existed alone in the watery mass of Nun which filled the universe. The universe was enrapt by a vast mass of primordial waters, and the Benben, a pyramid mound, emerged amid this primal chaos. There was a lotus flower with Benben, and from this, when it blossomed, emerged Ra. "I am Atum when he was alone in Nun, I am Ra when he dawned, when he began to rule that which he had made." This passage talks about how Atum created everything in human form out of the chaos and how Ra then began to rule over the Earth where humans and divine beings coexisted. He created Shu, god of air, and the goddess of moisture, Tefnut. The siblings symbolized two universal principles of humans: life and right (justice). Ra was believed to have created all forms of life by calling them into existence by uttering their secret names. In some accounts humans were created from Ra's tears and sweat.

In the underworld

Ra was thought to travel on the Atet, two solar barques called the Mandjet (the Boat of Millions of Years) or morning-boat and the Mesektet or evening-boat. These boats took him on his journey through the sky and the Duat – twelve hours of night which is also the literal underworld of Egypt. While Ra was on the Mesektet, he was in his ram-headed form. When Ra traveled in his sun-boat, he was accompanied by various other deities including Sia (perception) and Hu (command), as well as Heka (magic power). Sometimes, members of the Ennead helped him on his journey, including Set, who overcame the serpent Apophis, and Mehen, who defended against the monsters of the underworld. When Ra was in the underworld, he would visit all of his various forms. Apophis, the god of chaos (isfet), was an enormous serpent who attempted to stop the sun-boat's journey every night by consuming it or by stopping it in its tracks with a hypnotic stare. During the evening, the Egyptians believed that Ra set as Atum or in the form of a ram. The night boat would carry him through the underworld and back towards the east in preparation for his rebirth. These myths of Ra represented the sun rising as the rebirth of the sun by the sky-goddess Nut; thus attributing the concept of rebirth and renewal to Ra and strengthening his role as a creator god as well. When Ra was in the underworld, he merged with Osiris, the god of the dead.

Iconography

… excerpt ends here. Continue reading the full article.

Illustrations

Ra illustration
Ra illustration
Ra: Ra on the solar barque on his daily voyage across the sky (𓇯), adorned with the sun-disk
Ra on the solar barque on his daily voyage across the sky (𓇯), adorned with the sun-disk
Ra: Jewelry of Ra as a falcon with spread wings, adorned with the sun-disk and holding the ankh, the  hieroglyphic symbol of life
Jewelry of Ra as a falcon with spread wings, adorned with the sun-disk and holding the ankh, the hieroglyphic symbol of life
Ra: Inlay depicting the squatting Ra with the sun-disk placed atop his falcon head
Inlay depicting the squatting Ra with the sun-disk placed atop his falcon head

Worked examples

Example 1 — a first encounter with Ra

Start with the simplest possible case. Write down what Ra claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ra before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ra ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ra

In research
Ra appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Ra in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Ra is common in secondary-school and first-year university syllabi. It links to neighbouring topics Avian humanoids, Creator gods, Egyptian gods, so understanding it makes those chapters shorter.
In everyday life
Look for Ra outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ra in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Ra means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Ra out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ra in simple terms?

Ra (; Ancient Egyptian: 𓂋𓐰𓂝𓇳, romanized: rꜥ; also transliterated rꜥw, pronounced [ˈɾiːʕuw] ; cuneiform: 𒊑𒀀 ri-a or 𒊑𒅀ri-ia; Phoenician: 𐤓𐤏, romanized: rʿ) or Re (Coptic: ⲣⲏ, romanized: Rē) was the ancient Egyptian deity of the Sun. By the Fifth Dynasty, in the 25th and 24th centuries BC…

Why does Ra matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ra?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ra.

Tags

  • Avian humanoids
  • Creator gods
  • Egyptian gods
  • Falcon deities
  • Kings of the gods
  • Legendary progenitors
  • Lion gods
  • Nubian gods
  • Personifications
  • Ra
  • Sky and weather gods
  • Solar gods

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