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 ?
The analemma offers a graphic display of one of the lessons a horologium can teach: the difference between clock time and sun time.
A comparison of four analemmas for determining the azimuth of the Qibla.