The astronomical world, also referred to as the astronomical lifeworld (especially in any psychological, phenomenological or epistemological applications of the term), is a common word in the Astronist lexicon, especially when discussing the worldview of Astronism, which itself known as cosmocentrism. Although not widely used in the founding book of Astronism, known as the Omnidoxy, the term astronomical world has had significant impact on the Astronist worldview and philosophy in a post-omnidoxical context. 

It is broadest use, the astronomical world is an alternative for the widely used term of The Cosmos which is used throughout the Omnidoxy and countlessly in wider Astronist discourse. While the term The Cosmos is used to specifically refer to outer space as a whole of an animate and as a spiritually and intellectually interactable nature with religious significance, the term astronomical world is used with a slightly different specified meaning (although it may too be used and is used in the same context that the term The Cosmos is used). 

In it specified definition, the astronomical world refers to the conception of all that is astronomical as holding both an authoritative and gatekeeping role for both humanity and terrestrial nature itself. It is for this reason that the astronomical world term is particularly associated with the concept of astronomical authority. Another reason for their close association is because Cometan conceived these concepts on the same day, simultaneous to each other.