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Kaṇāda (Sanskrit: कणाद, IAST: Kaṇāda), also known as Kaṇabhaksha, Kaṇabhuj was an ancient Indian natural scientist and philosopher who founded the Vaisheshika school of Indian philosophy that also represents the earliest Indian physics.

Estimated to have lived sometime between 6th century to 2nd century BCE, little is known about his life. His traditional name Kaṇāda means "eater of atoms", and he is known for developing the foundations of an atomistic approach to philosophy in the Sanskrit text Vaiśeṣika Sūtra. His text is also known as Kaṇāda Sūtra, or "Aphorisms of Kaṇāda".

The school founded by Kaṇāda explains the creation and existence of the universe by proposing an atomistic theory, applying logic and realism, and is one of the earliest known systematic realist ontology in human history. Kaṇāda suggested that everything can be subdivided, but this subdivision cannot go on forever, and there must be smallest entities (paramāṇu) that cannot be divided, that are eternal, that aggregate in different ways to yield complex substances and bodies with unique identity, a process that involves heat, and this is the basis for all material existence. He used these ideas with the concept of Atman (soul, Self) to develop a non-theistic means to moksha. If viewed from the prism of physics, his ideas imply a clear role for the observer as independent of the system being studied. Kaṇāda's ideas were influential on other schools of Hinduism, and over its history became closely associated with the Nyaya school of Hindu philosophy.

Kaṇāda's system speaks of six properties (padārthas) that are nameable and knowable. He claims that these are sufficient to describe everything in the universe, including observers.……

Lifetime

The century in which Kaṇāda lived is unclear and has been a subject of a long debate. In his review of 1961, Riepe states Kaṇāda lived sometime before 300 CE, but convincing evidence to firmly put him in a certain century remains elusive.

The Vaiśeṣika Sūtras mention competing schools of Indian philosophy such as Sāṃkhya and Mīmāṃsā, but make no mention of Buddhism, which has led scholars in more recent publications to posit estimates of 6th century BCE. The Vaiśeṣika Sūtra manuscript has survived into the modern era in multiple versions and the discovery of newer manuscripts in different parts of India by Thakur in 1957 and Jambuvijayaji in 1961, followed by critical edition studies, suggest that the text attributed to Kaṇāda was systematized and finalized sometime between 200 BCE and the start of the common era, with the possibility that its key doctrines may be much older. Multiple Hindu texts dated to the 1st and 2nd century CE, such as the Mahāvibhāṣa and Jñānaprasthana from the Kushan Empire, quote and comment on Kaṇāda's doctrines.……

Ideas

Physics is central to Kaṇāda's assertion that all that is knowable is based on motion. His ascribing centrality to physics in the understanding of the universe also follows from his invariance principles. For example, he says that the atom must be spherical since it should be the same in all dimensions. He asserts that all substances are composed of four types of atoms, two of which have mass and two are massless.

Kaṇāda presents his work within a larger moral framework by defining Dharma as that which brings about material progress and highest good. He follows this sūtra with another that asserts that the Vedas have gained respect because they teach such Dharma, and something is not Dharma simply because it is in the Vedas.

Kaṇāda and early Vaisheshika scholars focused on the evolution of the universe by law. However, this was not unusual for his times since several major early versions of Hindu philosophies such as Sāṃkhya, Nyāya, Mīmāṃsā along with sub-schools of Yoga and Vedanta, as well as non-Vedic schools such as Jainism and Buddhism, were similarly non-theistic.……