analemma

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analemma

(an-ă-lem -ă) The shape resembling a figure of eight obtained by plotting the position of the Sun relative to the intersection of a meridian and the celestial equator at a fixed (mean) time every day throughout the year. The analemma's vertical extent is a reflection of the changes in the Sun's declination arising from the inclination of the Earth's axis to the perpendicular to its orbit. The horizontal extent arises from the fact that the Earth's orbit is elliptical, which produces a difference between the length of the apparent solar day (the actual time between successive meridian transits of the Sun) and the mean solar day.

analemma

[‚an·ə′lem·ə]
(astronomy)
A figure-eight-shaped diagram on a globe showing the declination of the sun throughout the year and also the equation of time.
(civil engineering)
Any raised construction which serves as a support or rest.

analemma

1. A retaining wall at the side of an ancient Greek or Roman theater.
2. Any raised construction which serves as a support or rest.
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References in periodicals archive ?
They were fascinated by the time-telling ability of the analemmatic sundial and had an opportunity to observe the sun in both white and Hydrogen Alpha light.
A further type of sundial is the analemmatic dial, which has a horizontal dial and a vertical gnomon.
Among the choices are a polar-style sundial (the most common type), an analemmatic sundial (rare, but simple to construct), and a cylindrical sundial.