Astronism.org, formerly known as Millettism.org, is the primary publisher of Astronist content and is solely owned and managed by The Institution of The Philosophy of Millettism. Astronism.org acts as both the url for the publisher's website as well as its brand name and is used across the official social media accounts representing the organised philosophy of Astronism. Astronism.org can be described as the public-facing representative for The Institution of The Philosophy of Millettism.

Therefore, Astronism.org forms a major part of the branding, commercialisation, and dissemination of ideas regarding the philosophy and is integral to the marketing mechanisms employed by The Institution.

Main functions of Astronism.org:

• Responsible for biographical writing of Cometan and other Astronist figures.
• Responsible for definitions and explanatory pieces regarding Astronist beliefs and concepts.
• Management of all Institution-owned websites.
• Management of all Institution-owned social media channels.

Subsidiaries of Astronism.org:

• Photography Lately (photography agency)
• Cometanica (archival documents and images)

Millettarian Photographic Institute