- Rockport State Park (Washington) (Wikipedia)
Rockport State Park is a 632-acre (256 ha) public recreation area at the foot of Sauk Mountain in Skagit County, Washington. The state park is notable for its nearly 600 acres (240 ha) of old-growth forest. The park offers five miles of hiking trails including the Sauk Mountain Trail and the Evergreen Trail which traverses the old-growth forest.
- Absolute magnitude (Wikipedia)
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.