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词汇 Tutulemma
分类 英语词汇 英语翻译词典
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Tutulemma

英语百科

Analemma

Afternoon analemma photo taken in 1998–1999 by Jack Fishburn in Murray Hill, New Jersey, USA. The Bell Laboratories building is in the foreground.
Analemma with date marks, printed on a globe, Globe Museum, Vienna, Austria
Analemma plotted as seen at noon GMT from  the Royal Observatory, Greenwich (latitude 51.48° north, longitude 0.0015° west).
Diagram of an analemma looking east in the northern hemisphere. The dates of the Sun's position are shown (in German). This analemma is calculated, not photographed.

In astronomy, an analemma (/ˌænəˈlɛmə/; from Greek ἀνάλημμα "support") is a diagram showing the deviation of the Sun from its mean motion in the sky, as viewed from a fixed location on the Earth. Due to the Earth's axial tilt and orbital eccentricity, the Sun will not be in the same position in the sky at the same time every day. The north–south component of the analemma is the Sun's declination, and the east–west component is the equation of time. This diagram has the form of a slender figure-eight, and can often be found on globes of the Earth.

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