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Analemma
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In astronomy, an analemma is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same mean solar time over the course of a year. The change of position i
Analemma with date marks, printed on a globe, Globe Museum, Vienna, Austria
Analemma with date marks, printed on a globe, Globe Museum, Vienna, Austria
The analemma cutout of this sundial causes the edge of the shadow to fall on the true time.
The analemma cutout of this sundial causes the edge of the shadow to fall on the true time.
Diagram of an analemma looking east in the Northern Hemisphere. The dates of the Sun's position are shown. This analemma is calculated for 9am, not ph
Diagram of an analemma looking east in the Northern Hemisphere. The dates of the Sun's position are shown. This analemma is calculated for 9am, not photographed.
Groundtrack of QZSS geosynchronous orbit. Seen from the ground, its analemma would have a similar shape.
Groundtrack of QZSS geosynchronous orbit. Seen from the ground, its analemma would have a similar shape.
Equation of time
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The equation of time describes the discrepancy between two kinds of solar time. The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean sol
Analemma
…respect to the stars (the ecliptic). The diagram resembles a figure eight. Globes of the Earth often display an analemma as a two-dimensional figure of equation of time ("sun fast") vs. declination of the Sun. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of…
This graph shows how many minutes the clock is ahead (+) or behind (−) the apparent sun. See the section "Notation" below.
This graph shows how many minutes the clock is ahead (+) or behind (−) the apparent sun. See the section "Notation" below.
Clock with auxiliary dial displaying the equation of time. Piazza Dante, Naples (1853)
Clock with auxiliary dial displaying the equation of time. Piazza Dante, Naples (1853)
A sundial made in 1812 by Whitehurst & Son, with a circular scale showing the equation of time correction. This is now on display in Derby Museum and
A sundial made in 1812 by Whitehurst & Son, with a circular scale showing the equation of time correction. This is now on display in Derby Museum and Art Gallery.
Marine sandglass MMM
Marine sandglass MMM