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This page was last edited on 4 December 2024, at 13:54 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Sometimes the stones from the local area and sometimes they represent the Welsh counties, such as at Aberystwyth. A large, flat-topped stone, known as the Logan Stone, lies at the centre of the circle and serves as a platform. Gorsedd circle at Menai Bridge, Anglesey, with the Menai Suspension Bridge in the background
The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur. Formulation
A white night is a night with only civil twilight which lasts from sunset to sunrise. [17] At the winter solstice within the polar circle, twilight can extend through solar noon at latitudes below 72.561° (72°33′43″) for civil twilight, 78.561° (78°33′43″) for nautical twilight, and 84.561° (84°33′43″) for astronomical twilight.
The circle of equal altitude, also called circle of position (CoP), is defined as the locus of points on Earth on which an observer sees a celestial object such as the sun or a star, at a given time, with the same observed altitude.
The third wall is a full circle, 110 m in diameter and 2.6 m wide. The fourth and outermost wall is the largest: 150 m in diameter and 3.2 m wide. A central tumulus 65 feet (20 m) in diameter and 15 feet (4.6 m) high is surrounded by concentric circles, the outermost of which is 520 feet (160 m) in diameter and 8 feet (2.4 m) high. [1]
Sun path, sometimes also called day arc, refers to the daily (sunrise to sunset) and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. The Sun's path affects the length of daytime experienced and amount of daylight received along a certain latitude during a given season.
On Earth, the terminator is a circle with a diameter that is approximately that of Earth. [1] The terminator passes through any point on Earth's surface twice a day, at sunrise and at sunset, apart from polar regions where this only occurs when the point is not experiencing midnight sun or polar night. The circle separates the portion of Earth ...