astronomy

Pure abodes

Pure abodes 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 Pure abodes rather than just read about it. In short: The Śuddhāvāsa (Sanskrit: शुद्धावास; Pali: सुद्धावास, romanized: suddhāvāsa; Tibetan: གནས་གཙང་མ་, Wylie: gnas gtsang ma; Vietnamese: Tịnh Cư Thiên; Chinese: 五部淨居天／五部净居天; Japanese: 五部浄居天, romanized: gobujōgoten; Korean: 정거천, romanized: jeonggeocheon; Thai: สุทฺธาวาส) worlds or "Pure Abodes" are distinct from the other worlds of the rūpadhātu in that they do not house beings who have been born there through ordinary m…

Key takeaways

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

Reference excerpt

The Śuddhāvāsa (Sanskrit: शुद्धावास; Pali: सुद्धावास, romanized: suddhāvāsa; Tibetan: གནས་གཙང་མ་, Wylie: gnas gtsang ma; Vietnamese: Tịnh Cư Thiên; Chinese: 五部淨居天／五部净居天; Japanese: 五部浄居天, romanized: gobujōgoten; Korean: 정거천, romanized: jeonggeocheon; Thai: สุทฺธาวาส) worlds or "Pure Abodes" are distinct from the other worlds of the rūpadhātu in that they do not house beings who have been born there through ordinary merit or meditative attainments, but only those Anāgāmins ("Non-returners") who are already on the path to Arhat-hood and who will attain enlightenment directly from the Śuddhāvāsa worlds without being reborn in a lower plane. Every Śuddhāvāsa deva is therefore a protector of Buddhism. (Brahma Sahampati, who appealed to the newly enlightened Buddha to teach, was an Anagami from a previous Buddha). Because a Śuddhāvāsa deva will never be reborn outside the Śuddhāvāsa worlds, no Bodhisattva is ever born in these worlds, as a Bodhisattva must ultimately be reborn as a human being. Since these devas rise from lower planes only due to the teaching of a Buddha, they can remain empty for very long periods if no Buddha arises. However, unlike the lower worlds, the Śuddhāvāsa worlds are never destroyed by natural catastrophe. The Śuddhāvāsa devas predict the coming of a Buddha and, taking the guise of Brahmins, reveal to human beings the signs by which a Buddha can be recognized. They also ensure that a Bodhisattva in his last life will see the four signs that will lead to his renunciation.

Five Pure Abodes The Princeton Dictionary of Buddhism states that "The heavens of the realm of subtle materiality (rūpadhātu) consist of sixteen (according to the Sarvāstivāda school), seventeen (the Sautrantika school), or eighteen levels (the Theravada/Sthavirankāya school) of devas ... The last five heavens are collectively designated as the five pure abodes, and the divinities residing there are called the Śuddhāvāsakāyika devas." The five Śuddhāvāsa worlds are:

Akaniṣṭha or Akaniṭṭha (Sanskrit; Pali; Tibetan: འོག་མིན, Wylie: ’og min) – World of devas "equal in rank" (literally: having no one as the youngest). The highest of all the Rūpadhātu worlds, it is often used to refer to the highest extreme of the universe. The current Śakra will eventually be born there. The duration of life in Akaniṣṭha is 16,000 kalpas (Vibhajyavāda tradition). The ruler of Akaniṣṭha is Maheśvara. The height of this world is 167,772,160 yojanas above the Earth (approximately the distance of Saturn from Earth). Sudarśana or Sudassī (Tibetan: ཤིན་ཏུ་མཐོང, Wylie: shin tu mthong) – The "clear-seeing" devas live in a world similar to and friendly with the Akaniṣṭha world. The height of this world is 83,886,080 yojanas above the Earth (approximately the distance of Jupiter from Earth). Sudṛśa or Sudassa (Tibetan: གྱ་ནོམ་སྣང་བ, Wylie: gya nom snang ba) – The world of the "beautiful" devas are said to be the place of rebirth for five kinds of anāgāmins. The height of this world is 41,943,040 yojanas above the Earth. Atapa or Atappa (Tibetan: མི་གདུང་བ, Wylie: mi gdung ba) – The world of the "untroubled" devas, whose company those of lower realms wish for. The height of this world is 20,971,520 yojanas above the Earth (approximately the distance of Sun from Earth). Avṛha or Aviha (Tibetan: མི་ཆེ་བ, Wylie: mi che ba) – The world of the "not falling" devas, perhaps the most common destination for reborn Anāgāmins. Many achieve arhatship directly in this world, but some pass away and are reborn in sequentially higher worlds of the Pure Abodes until they are at last reborn in the Akaniṣṭha world. These are called in Pāli uddhaṃsotas, "those whose stream goes upward". The duration of life in Avṛha is 1,000 kalpas (Vibhajyavāda tradition). The height of this world is 10,485,760 yojanas above the Earth (approximately the distance of Mars from Earth).

References

Worked examples

Example 1 — a first encounter with Pure abodes

Start with the simplest possible case. Write down what Pure abodes 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 Pure abodes 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 Pure abodes 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 Pure abodes

In research: Pure abodes 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 Pure abodes 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: Pure abodes is common in secondary-school and first-year university syllabi. It links to neighbouring topics Buddhist cosmology, Buddhist philosophical concepts, so understanding it makes those chapters shorter.
In everyday life: Look for Pure abodes 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Pure abodes in 20 minutes

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

Frequently asked questions

What is Pure abodes in simple terms?

Why does Pure abodes 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 Pure abodes?

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 Pure abodes.