👉 The term "arillary" is a term in English that refers to an artificial or constructed structure, particularly one used for astronomical observations. It is often associated with observatories and telescopes, where the use of mirrors, lenses, and other optical devices allows for the observation of celestial objects such as the Earth's orbit around the sun and its movement through space. The term "arillary" is also commonly used in the context of scientific research to refer to the study of astronomical phenomena using telescopes