rai

Example:The rai of the Sun is about 1,000 times that of the Earth.

Definition:A unit of distance used in astronomy, equivalent to the average distance from the Earth to the Sun, approximately 149.6 million kilometers.

Example:The rai of a star is a measure of its apparent brightness as seen from Earth.

Definition:The degree to which light strikes the eye. This term is used in astronomy to describe how bright a star appears from Earth.

Example:The rai of a variable star can change significantly over time, affecting its apparent magnitude.

Definition:A measure of the brightness of a celestial object as seen from Earth, on an inverse logarithmic scale. A smaller number means a brighter object.