The degree of brightness of a star or other celestial body, measured on a logarithmic scale in which lower numbers mean greater brightness, such that a decrease of one unit represents an increase in brightness by a factor of 2.512. An object that is 5 units less than another object on the magnitude scale is 100 times more luminous. Because of refinements in measurement after the zero point was assigned, very bright objects have negative magnitudes. &diamf3; The brightness of a celestial body as seen from Earth is called its apparent magnitude . (When unspecified, an object's magnitude is normally assumed to be its apparent magnitude.) The dimmest stars visible to the unaided eye have apparent magnitude 6, while the brightest star in the night sky, Sirius, has apparent magnitude −1.4. The full Moon and the Sun have apparent magnitudes of −12.7 and −26.8 respectively. &diamf3; The brightness of a celestial body computed as if viewed from a distance of 10 parsecs (32.6 light-years) is called its absolute magnitude . Absolute magnitude measures the intrinsic brightness of a celestial object rather than how bright it appears on Earth, using the same logarithmic scale as for apparent magnitude. Sirius has an absolute magnitude of 1.5, considerably dimmer than Rigel which, though its apparent magnitude is 0.12, has an absolute magnitude of −8.1. Stars that appear dim in the night sky but have bright absolute magnitudes are much farther from Earth than stars that shine brightly at night but have relatively dim absolute magnitudes. The Sun, a star of only medium brightness, has an absolute magnitude of 4.8. &diamf3; The degree of total radiation emitted by a celestial body, including all infrared and ultraviolet radiation in addition to visible light, is called its bolometric magnitude . Bolometric magnitude is generally measured by applying a standard correction to an object's absolute magnitude.
Find another word for immensity. In this page you can discover 31 synonyms, antonyms, idiomatic expressions, and related words for immensity, like: infinity, vastness, greatness, massiveness, hugeness, enormousness, immeasurableness, boundlessness, bulkiness, sizableness and immenseness.
Looking into the immensity of space, man also looks into the depths of godhead.
Clarke appeals to the immensity of time and space as involving infinity in God.
First, in the spontaneous stage, where reflection is not yet developed, and art is imperfect, humanity has thought only of the immensity around it.
At the end of his life he wrote of Amiel, "The man who has time to keep a private diary has never understood the immensity of the universe."
- These vast ruins, more imposing from their immensity than pleasing in detail, have been described by scores of travellers and tourists; but it will be sufficient here to refer to the following works: - (First discoverers) M.