Buddhist cosmology

Buddhist cosmology describes a universe centered on Mount Meru, a colossal mountain surrounded by concentric rings of mountains and oceans, with four continents at the cardinal points.¹ The human world (Jambudvīpa) is the southern continent, where the historical Buddha appeared. Above Mount Meru are the heavens of the desire realm, including the realms of the Four Great Kings and the Thirty-three Gods (Trāyastriṃśa), where deities like Indra reside. Above these are the form realms (rūpa-dhātu) and formless realms (ārūpya-dhātu), inhabited by beings in deep meditative states. The entire system is enclosed within a cosmic mountain range, and countless such world-systems (cakkavāḷa) exist, each with its own Mount Meru and realms, extending infinitely in space.

The three realms of saṃsāra—the desire realm (kāma-dhātu), form realm (rūpa-dhātu), and formless realm (ārūpya-dhātu)—contain 31 planes of existence, ranging from the deepest hells to the highest formless heavens.² Beings are reborn according to their karma, with wholesome actions leading to favorable rebirths and unwholesome actions to unfavorable ones. The desire realm includes the hells (naraka), hungry ghosts (preta), animals, humans, and various deities. The form realm is inhabited by beings who have attained meditative absorptions (jhānas), and the formless realm by those who have mastered the formless attainments. Even the highest heavens are impermanent; when the merit that led to rebirth there is exhausted, beings fall to lower realms. The only escape from this cycle is enlightenment (nirvāṇa), which transcends all realms.

Buddhist cosmology posits an infinite cycle of expansion and contraction of the universe, measured in kalpas (eons).³ A mahākalpa (great eon) consists of four asaṃkhyeyakalpas (incalculable eons), each marked by the formation, abiding, destruction, and voidness of a world-system. During the destruction phase, fire, water, or wind annihilates the realms, and beings are reborn in higher heavens until a new universe forms. The lifetime of a human has varied over time, from extremely long in the past to a maximum of 80,000 years in the present age, and will decline to 10 years in the future before rising again. The Buddha's teachings are said to disappear after 5,000 years, but the universe continues its cycles without beginning or end.⁴

Beyond the standard cosmology, there are lesser-known details: the world is said to rest on water, which rests on air, which rests on space, and at the base of the universe is a circle of wind.¹ The sun and moon orbit Mount Meru, and their positions cause day and night, as well as seasons. The hells are not only underground but also include peripheral hells such as the 'screaming' and 'great screaming' hells, each with specific torments. The continent of Jambudvīpa is named after the rose-apple tree (jambu) that grows there. In some traditions, the world is divided into three thousand-fold world-systems (trisāhasramahāsāhasralokadhātu), each with its own Buddha. The cosmology also includes the concept of 'world cycles' (saṃvarta) and 'world cycles of abiding' (vivarta), which are detailed in the Abhidharma literature.⁵

Buddhist cosmology is not a literal description of the physical universe but a symbolic map of consciousness and karma.⁶ It serves as a framework for understanding the cycle of rebirth and the urgency of seeking liberation. The realms are often depicted in Buddhist art, such as the Wheel of Life (bhavacakra), which shows the six main realms of the desire realm. In meditation, the cosmology is used as a basis for developing dispassion and compassion, as one visualizes the suffering of beings in various realms. Modern scholars interpret the cosmology as a reflection of ancient Indian worldview, but its psychological and ethical dimensions remain relevant in Buddhist practice today.

Saṃsāra

The cycle of birth, death, and rebirth.

Karma

Intentional action that leads to future consequences.

Nirvāṇa

The ultimate liberation from saṃsāra.

Jhāna

Meditative absorption states.

Kalpa

An eon, a vast period of time.