Nancy Holt, Dark Star Park [detail] ( 1979-1984)
Rosslyn, Arlington County, Virginia
Gunited concrete, stone masonry, asphalt, steel, water, earth, grass, plants, willow oak
Overall surface acrea: Two-thirds of an acre (.27 ha)
Sphere diameters: three 8 ft. (2.4 m) and two 6 ft. 6 1⁄2 in. (1.9 m)
Pool diameters: one 18 ft. (5.4 m) and one 15 ft. (4.6 m)
Pool depth: 1 ft. 6 in. (45.7 cm)
Large tunnel: L. 25 ft. (7.6) x inner Diam. 10 ft. (3 m)
Small tunnel: L. 15 ft. (4.5m) x inner Diam. 3 ft. (.91 m)
Pole heights: two 20 ft. (6.1 m) and two 16 ft. 8 5⁄8 in. (5.1 m)
Pole diameter: 6 in. (15.2 cm)
Sun/shadow alignment: The shadows cast by the spheres and the steel poles line up with the shadow patterns on the ground each year on August 1 at approximately 9:32 a.m., the anniversary of the day in 1860 when William Henry Ross acquired land that later became Rosslyn.