Astronist ethics, also referred to as Millettarian ethics, or Cometanic ethics, is a major discipline of study dealing with the Astronist approach to various ethical issues leading to the formation of a unique ethical system associated with Astronist philosophy and beliefs. Astronist ethics is often synonymous with the inclusive discipline of contology, although contology differs in that it also encompasses the Astronist approach to epistemology, the study of knowledge, hence it covers a wider area than Astronist ethics itself.

Astronist ethics is essentially predicated upon the notion that all people are provided with unique extents of freedom and it is this freedom which should be preserved as one's ethical mandate. Therefore, the most ethical of all decisions is that which either increases one's freedom, or at least preserves it from being depleted. Astronist ethics, due to the beliefs held within wider Astronism, considers freedom to be the ultimate existential goal and the ideal state of being for all humans.

Astronist ethics equates freedom with what is deemed as right and therefore, whatever provides greater freedom is the most ethical decision to make. A decision leading to the depletion of one's own freedom or another person's freedom is identified as being ethically and morally wrong.

This approach to ethics and the application of this principle to all situations is eleuthesis or eleuthication or eleuthification.

The Astronist ethical system is entirely oriented towards the achievement of freedom in every scenario on small and large scales, known as microleu and macroleu respectively. Astronist ethics essentially states that any decision would inhibit or otherwise decrease the extent of one’s freedom or the ability of one to be or to feel free is ethically wrong, hence we should only take decisions and actions that we are somewhat sure of their eleuthicality (their adherence to eleuthesis).

To eleuthify is to make something about freedom.

Eleuthonism - also referred to as the eleuthonic principle, the principle of equating freedom with righteousness.

With Astronist ethics being themed on freedom as the central element, the discipline is prerologised and is intrinsically associated with the specific discipline dealing with freedom, eleuthonology.

There are types of freedom in Astronist ethics, mental and physical freedom and there are two forms of freedom in Astronist ethics, autothonic and empothonic, the former of which pertains to one’s own freedom while the latter pertains to another person’s freedom. The freedom of humanity, or collective freedom, is known as cothonic.

Astronist ethical principles state that freedom should be the primary attainable goal for all humans individually as well as humanity collectively. However, the ambiguity of the term freedom is duly noted and to which a uniquitarian understanding can be ascribed in the sense that each person’s consideration of what freedom is remains unique to them.

One of the essential issues with the Astronist ethical system based on eleuthonism is that actions of progression and responsibility are often debilitators of freedom. Therefore, decisions must be made so as to preserve one’s freedom, in essence spending one’s freedom as and when the circumstances demand it. To be a practitioner of eleuthonism is to find one’s unique balance between giving up or spending one’s freedom and having responsibilities or conducting certain actions that one seems desirable to their ambitions.

Astronists consider all choices to be at the price of freedom with some choices costing greater extents of freedom than others. Astronist ethics therefore states that if choices are made to the depletion of one’s own freedom or to the freedom of others then the consequences of those choices in the depletion of freedom must be accepted. Astronist ethics does not deny the importance or the benefits of traditionally depletative actions such as marriage or having children, and neither does it discouraged going ahead with such actions, but it stresses the consideration of the limitations to one’s freedom as a direct result of such actions.

The Astronist ethical system can be considered eleucentric, meaning that freedom, its consideration, its attainment and its preservation are provided with the greatest level of importance.

Hypereleuthonism - a form of eleuthonism stating that anything which depletes one’s own freedom or the freedom of humanity (depending on its application) are to be entirely avoided.

Hypoeleuthonism - a form of eleuthonism stating that anything which depletes freedom  can be conducted as long as it progresses either oneself, someone else, a particular cause, or all of humanity.

-thonic - suffix relating to freedom.

Extents of freedom - the uniquitarian ethical concept stating that each person has their own unique extent to which they are able to be free, either physically or mentally. This is ascribed to them as part of their unique existential path.