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Hjúki and Bil

Hjúki and Bil is a science 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 Hjúki and Bil rather than just read about it. In short: In Norse mythology, Hjúki (Old Norse: [ˈhiu̯ːke], possibly meaning "the one returning to health") and Bil (O.N.: [ˈbil], literally "instant") are a brother and sister pair of children who follow the personified Moon, Máni, across the heavens. Both Hjúki and Bil are solely attested in the Prose Edda, written in the 13th century by Snorri Sturluson.

Hjúki and Bil — main illustration
Hjúki and Bil — illustration

Key takeaways

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

Reference excerpt

In Norse mythology, Hjúki (Old Norse: [ˈhiu̯ːke], possibly meaning "the one returning to health") and Bil (O.N.: [ˈbil], literally "instant") are a brother and sister pair of children who follow the personified Moon, Máni, across the heavens. Both Hjúki and Bil are solely attested in the Prose Edda, written in the 13th century by Snorri Sturluson. Scholarly theories that surround the two concern their nature, their role as potential personifications of the craters on the Moon or its phases, and their relation to later folklore in Germanic Europe. Bil has been identified with the Bilwis, an agriculture-associated figure that is frequently attested in the folklore of German-speaking areas of Europe.

Attestations In chapter 11 of the Prose Edda book Gylfaginning, the enthroned figure of High states that two children by the names of Hjúki and Bil were fathered by Viðfinnr. Once while the two were walking from the well Byrgir (Old Norse "Hider of Something") — both of them carrying on their shoulders the pole Simul (Old Norse, possibly meaning "eternal") that held the pail Sæg between them – Máni took them from the Earth, and they now follow Máni in the heavens, "as can be seen from the earth". Hjúki is otherwise unmentioned, but Bil receives recognition. In chapter 35 of Gylfaginning, at the end of a listing of numerous other goddesses in Norse mythology, both Sól (the personified Sun) and Bil are listed together as goddesses "whose nature has already been described". Bil appears twice more in the Prose Edda book Skáldskaparmál. In chapter 75, Bil appears within another list of goddesses, and her name appears in chapter 47 in a kenning for "woman".

Theories

Identification and representation As the two are otherwise unattested outside Snorri's Prose Edda, suggestions have been made that Hjúki and Bil may have been of minor mythic significance, or that they were made up outright by Snorri, while Anne Holtsmark (1945) posits that Snorri may have known or had access to a now lost verse source wherein Hjúki and Bil personified the waxing and waning moon. Holtsmark further theorizes that Bil may have been a dís (a type of female deity). Scholars have theorized that Hjúki and Bil may represent lunar activity, including that they may represent the phases of the moon or may represent the craters of the Moon. Nineteenth-century scholar Jacob Grimm rejects the suggestion that Hjúki and Bil represent the phases of the moon, and states that Hjúki and Bil rather represent the craters on the Moon seen from the Earth. Grimm says that the evidence for this "is plain from the figure itself. No change of the moon could suggest the image of two children with a pail slung over their shoulders. Moreover, to this day the Swedish people see in the spots of the Moon two persons carrying a big bucket on a pole." Grimm adds that:

What is most important for us, out of the heathen fancy of a kidnapping man of the moon, which, apart from Scandinavia, was doubtless in vogue all over Teutondom, if not farther, there has evolved itself since a Christian adaptation. They say the man in the moon is a wood-stealer, who during church time on the holy sabbath committed a trespass in the wood, and was then transported to the moon as a punishment; there he may be seen with the axe on his back and the bundle of brushwood (dornwelle) in his hand. Plainly enough the water-pole of the heathen story has been transformed into the axe's shaft, and the carried pail into the thornbrush; the general idea of theft was retained, but special stress laid on the keeping of the christian holiday; the man suffers punishment not so much for cutting firewood, as because he did it on Sunday.

Grimm gives further examples from Germanic folklore until the time of his writing (the 19th century) and notes a potential connection between the German word wadel (meaning the full moon) and the dialectal employment of the word for "brushwood, twigs tied up in a bundle, esp[ecially] fir-twigs, wadeln to tie up brushwood", and the practice of cutting wood out in the full moon. Benjamin Thorpe agrees with the theory of Hjúki and Bil as the personified shapes of Moon craters. Rudolf Simek states that the obscurity of the names of the objects in the tale of Hjúki and Bil may indicate that Snorri derived them from a folktale, and that the form of the tale of the Man in the Moon (featuring a man with a pole and a woman with a bushel) is also found in modern folklore in Scandinavia, England, and Northern Germany.

In both the story Hjúki and Bil found in the Icelandic Prose Edda and the English nursery rhyme "Jack and Jill", two children, one male and one female, fetch a pail of water, and the pairs have names that have been perceived as phonetically similar. These elements have resulted in theories connecting the two, and the notion has had some influence, appearing in school books for children from the 19th century and into the 20th century. A traditional form of the rhyme reads:

Bilwis A figure by the name of Bilwis is attested in various parts of German-speaking Europe starting in the 13th century. Scholar Leander Petzoldt writes that the figure seems to stem from the goddess and over time saw many changes, later developing "an elfin, dwarfish aspect and the ability to cripple people or cattle with the shot of an arrow" (such as in Wolfram von Eschenbach's 13th century poem "Willehalm"). Petzoldt further surveys the development of the figure:

… excerpt ends here. Continue reading the full article.

Illustrations

Hjúki and Bil: Animation of the Moon as it cycles through its phases
Animation of the Moon as it cycles through its phases
Hjúki and Bil: A 19th century drawing of The Man in the Moon from folklore in areas of Germanic Europe
A 19th century drawing of The Man in the Moon from folklore in areas of Germanic Europe
Hjúki and Bil: Jack and Jill, proposed as connected to Hjúki and Bil
Jack and Jill, proposed as connected to Hjúki and Bil

Worked examples

Example 1 — a first encounter with Hjúki and Bil

Start with the simplest possible case. Write down what Hjúki and Bil claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Hjúki and Bil 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 Hjúki and Bil 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 Hjúki and Bil

In research
Hjúki and Bil appears in science 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 Hjúki and Bil 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
Hjúki and Bil is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brother-sister duos, Lunar deities, Mythological duos, so understanding it makes those chapters shorter.
In everyday life
Look for Hjúki and Bil 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 Hjúki and Bil in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hjúki and Bil 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 Hjúki and Bil out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hjúki and Bil in simple terms?

In Norse mythology, Hjúki (Old Norse: [ˈhiu̯ːke], possibly meaning "the one returning to health") and Bil (O.N.: [ˈbil], literally "instant") are a brother and sister pair of children who follow the personified Moon, Máni, across the heavens. Both Hjúki and Bil are solely attested in the Prose Edda…

Why does Hjúki and Bil matter?

Because it connects several science 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 Hjúki and Bil?

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 Hjúki and Bil.

Tags

  • Brother-sister duos
  • Lunar deities
  • Mythological duos
  • Norse deities
  • Æsir

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