Fantasy Astronomy centers around the depiction of the study of astronomy and astrology in fictional fantasy settings. These visuals are based on astronomers during the Scientific Revolution (16th-17th centuries) but are included in stories with magic systems and feudal politics, with a setting, usually an observatory that has whimsical architecture and scholarly characters.

The astronomy depicted in the fictional situations and aesthetic pictures is much simpler and magical than actual astronomy, as mapping constellations, making observations through a telescope, astrology, divination, and how the stars relate to the fictional world's magic system are common areas of study for the character or visual design.

Fantasy Astronomy depicts imagery and research of the cosmos. Certain aspects of this aesthetic are similar to Academia aesthetics - with books of astronomy, telescopes, and star maps.

Victorian era and Victorian-inspired fashion as well as fashion from around the 1920s-1960 is included in the typical style of dress for Fantasy Astronomy. You might also find some elements of uniforms for academias. The fashion style is often showcased by starry-themed Victorian or vintage clothing. Also note that the star/space/celestial motifs don’t need to be present on every outfit or object. Clothing is not gender specific, nor any style of makeup or hair is specified. which is one of the ways the fashion might deviate from the time eras it takes from.

Anything that involves astronomy can be considered an activity of Fantasy Astronomy.