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 ?
Caption: The sundial is nearly complete here except for the analemma, which wasn't finished until the June 21st, 2018 solstice.
Most include a blend of Pinot Noir and Chardonnay, except for the 2014 and 2015 Codorniu Napa Grand Reserve Rose and the Analemma 2013 Atavus Blanc de Noirs, which are 100% Pinot Noir, and the 2001 Equinox Blanc de Blanc Cuvee de Chardonnay, which is 100% Chardonnay.
If the project goes through, the Analemma Tower will be the first ever revolving building outside Earth, as it would travel between hemispheres on a regular daily schedule.
A detailed explanation is beyond the scope of this text, but a web search for "analemma" will provide an abundance of online explanations and images.
The Sun is not on the meridian at noon at the solstices, so the analemma is skewed and does not line up with the vertical axis.
The analemma offers a graphic display of one of the lessons a horologium can teach: the difference between clock time and sun time.
An analemma is the figure-eight pattern that the Sun makes in the sky when photographed at the same time periodically throughout an entire year.
If our Earth had a perfectly circular orbit and no axial tilt, the Sun would always appear at the same point in the sky at the same time of day throughout the year and the analemma would be a dot.
Observers anywhere on Earth will see the Sun trace out the exact same analemma pattern projected against the sky through the course of a year.
By doing so he recorded the analemma in the sky--it's the flattened figure-8 seen on globes.
And while many photographers will target this rare meeting of the Sun and Moon using telescopes and telephoto lenses, I'm planning on shooting a very different kind of composite image of the event--a year-long analemma, with the eclipse adding that special shot to make the final result unique and interesting.
Apparently no one has ever recorded the analemma from a polar region.