Analemma

The analemma is a basis for calculation deduced from the course of the sun, and found by observation of the shadow as it increases until the winter solstice. ❋ Vitruvius Pollio (N/A)

For more information about the Analemma Society, visit www. analemma.org. ❋ Holly Hobbs (2010)

For it is from this revolution of the firmament, from the course of the sun through the signs in the opposite direction, and from the shadows cast by equinoctial gnomons, that we find the figure of the analemma. ❋ Vitruvius Pollio (N/A)

This is because the length of the shadow at the equinox is used in constructing the figure of the analemma, in accordance with which the hours are marked to conform to the situation and the shadow of the gnomon. ❋ Vitruvius Pollio (N/A)

Whoever wishes to find their baseplates, can easily do so from the books of these writers, provided only he understands the figure of the analemma. ❋ Vitruvius Pollio (N/A)

The hours, indicated by bronze rods in accordance with the figure of the analemma, radiate from a centre on the face. ❋ Vitruvius Pollio (N/A)

Let the hours be marked off transversely on the column from the analemma, and let the lines of the months also be marked upon the column. ❋ Vitruvius Pollio (N/A)

This having been drawn and completed, the scheme of hours is next to be drawn on the baseplates from the analemma, according to the winter lines, or those of summer, or the equinoxes, or the months, and thus many different kinds of dials may be laid down and drawn by this ingenious method. ❋ Vitruvius Pollio (N/A)

If the y-axis of the analemma was due to the Earth's axial tilt, then the x-axis comes from the Sun appearing fast or slow: ❋ Unknown (2009)

One neat, modern trick we've been able to photograph is an analemma, or a picture of the Sun at the same exact time on different days over the course of a year. ❋ Unknown (2009)

If you headed south, once you drop below the Arctic Circle, you'd be able to see the entire analemma, and it would start to tilt to one side. ❋ Unknown (2009)

Once you crossed the Antarctic Circle, the analemma, now nearly completely inverted, would start to disappear, until only the lower 50% was visible from the South Pole. ❋ Unknown (2009)

As the Earth's equinoxes precess (which they do over a time period of 26,000 years), the shape of our analemma ❋ Unknown (2009)

What two features of the earth and its revolution are responsible for the analemma shape? ❋ BHSEarthScience (2009)

If the Earth's orbit were a perfect circle, and the Earth always moved at the same speed around the Sun, our analemma would simply be a line, and the Sun would simply move along that line, reaching one end on the Summer Solstice and the other end on the Winter Solstice. ❋ Unknown (2009)

By time you got down to the equator, the analemma would be completely horizontal. ❋ Unknown (2009)

What does the analemma look like at other places on Earth? ❋ Unknown (2009)

So on a planet like Mercury, where the axial tilt is less than one degree, the Sun's position in the sky doesn't change from day-to-day, and so an analemma on Mercury is just a single point! ❋ Unknown (2009)

You can see, above, that (from the ruins) the above analemma is from the Northern Hemisphere. ❋ Unknown (2009)

[Dick and Jane] are having sex. Dick wants to have anal sex and Jane does not, they have now [discovered] that they have an [analemma]. ❋ Victorya R (2005)