👉 In astronomy, the term "tentillum" refers to a celestial body that appears as a bright white light when viewed from Earth. It is often associated with the constellation of Orion, which is known for its bright stars like Betelgeuse and Messier 21. The term "tentillum" is used by astronomers to describe celestial objects that are visible only during certain astronomical events or seasons. These objects can be as small as a speck in the night sky or as large as stars