- In astronomy, absolute magnitude (M) is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale. An object’s absolute magnitude is defined to be equal to the apparent magnitude that the object would have if it were viewed from a distance of exactly 10 parsecs (32.6 light-years), without extinction (or dimming) of its light due to absorption by interstellar matter and cosmic dust. By hypothetically placing all objects at a standard reference distance from the observer, their luminosities can be directly compared among each other on a magnitude scale. For Solar System bodies that shine in reflected light, a different definition of absolute magnitude (H) is used, based on a standard reference distance of one astronomical unit.
- Chelan County — Thumbnail History (historylink.org)
Chelan County embraces the drainages of the Wenatchee River, the Entiat River, and Lake Chelan, and the Chelan River for a total of 2,920 square miles. Irrigation has transformed the arid valleys into agricultural treasure houses and the home to Washington apples and the ubiquitous Aplet and Cotlet confections. Hydroelectric development has lived up to the Wenatchee Daily World’s claim, first made in the 1920s, that the region is the “Power Belt of the Great Northwest.” Almost 90 percent of the county is owned by the state and federal governments.