The Omnidoxy (meaning "knowledge of all things", or "knowledge for all"; also spelt Omnidoxi, Omnidoxí, Omnidoxa or Omnidoksi; Chinese: 全经; pinyin: Quánjīng), also known in colloquial dialogue as the book of Astronism, and formerly known as The Grand Centrality, is an extensive philosophical and religious treatise solely authored by Cometan as a result of his experience of surography, and as a result, it became the founding text of the organised philosophy of Astronism.

The authorship of The Omnidoxy rests in monauthoriality with Cometan who began writing the Omnidoxy at the age of seventeen through a series of personal inspirations that lasted a total of seven years forming an era known as The Founding of Astronism. By its completion, the Omnidoxy extended to over 2 million words in total length and remains a principal work of Astronic literature.

Partitioned according to twelve disquisitions which are further divided into hundreds of discourses, the titles of which are known as rubrals, The Omnidoxy is codified according to a unique writing structure known as insentence.

The Omnidoxy remains the principal book contributing to the founding of the foundations of Astronism and was the first text to introduce the concept of cosmocentricity, as well as the introducer of hundreds of belief orientations, schools of thought, and disciplines of study along with thousands of concepts and notions that subsequently formed the basis of Astronism.

The Omnidoxy is considered the founding text of Astronism and although it is classified to be a work as a product of the surography of Cometan, it does not generally share the same status and role as for example, the Bible in Christianity and the Quran in Islam. It is not a product of divine revelation, it is not an infallible text, and it is considered to be on the first of many doxian classified texts that will form the Canon of Astronism.

However, some groups within Astronism, namely those associated with the belief orientation of omnidoxism, place an all-importance on the Omnidoxy text as the only valid work of Astronist literature. This generally comes with the consideration that all other supposed works of Astronism are invalid and are not worthy of entering the Canon of Astronism.

The discipline of study known as omnidoxicology relates to the formal academic study and contemplation of The Omnidoxy by philosophers, scholars, and academics while that which is known as omnidoxical studies refers to the study of The Omnidoxy by ordinary people.

The historical origination of The Omnidoxy rests in its authorship by Brandon Taylorian during early 21st century England, specifically in the northern county of Lancashire. Like in all textual criticism, the timing and location of the codification of The Omnidoxy is integral to understanding why and how it was written, especially by considering the influential factors impacting Cometan during his construction of the text, particularly the cultural, political, religious, and social contexts of Taylorian's personal life and of wider society at the time. This forms an important branch of study within omnidoxicology known as omnidoxical criticism, or omnidoxical exegesis in which scholars study and investigate The Omnidoxy in order to discern conclusive judgements inspired by how, where, why, by whom, for whom, and in what circumstances The Omnidoxy was written.