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If you were to mark the point on a globe that represents the point on Earth where the sun is directly overhead at clock noon every day for a whole year, and to mark the date you made each dot, then connect the dots, and add a scale in the east-west direction showing each degree of longitude corresponding to four minutes, you would have an analemma. It doesn't matter what time zone you do this in as long as you do it in the same time zone all year and you don't adjust for Daylight Saving Time.
Its purpose comes from the fact that calendar days or clock days are all the same length of time, but real days are not. Although the average length of a real day, the average time from local solar noon to local solar noon, is 24 hours, half of the days are actually a little longer by different amounts and half are a little shorter. This is why when you look at a list of sunrise and sunset times for a certain place, the dates of the earliest and latest sunrise and sunset are not on the solstices. In fact, at some latitudes, the dates of the earliest sunrise and latest sunset or the dates of the latest sunrise and earliest sunset are over a month apart!
The figure-8-shaped scale can be found on most globes and sundials.
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What is the purpose for the analemma?
The analemma shows the position of the sun in the sky over the course of a year, accounting for variations in the Earth's orbit and axial tilt. It provides information about the sun's declination and the equation of time, which are important for accurate timekeeping and astronomical observations.
Is the analemma is a useful tool for locations north of the Tropic of Capricorn?
No, the analemma is a figure-eight shaped curve that shows the position of the Sun in the sky at a specific location at the same time of day throughout the year. For locations north of the Tropic of Capricorn, the analemma is not as useful because the Sun's path in the sky is closer to directly overhead during certain times of the year, making the figure-eight shape less pronounced.
Does the analemma determine how far a country is located from the equator?
No, the analemma is a figure-8-shaped diagram representing the declination of the Sun. It shows the variation of the Sun's position in the sky throughout the year. The distance of a country from the equator is determined by its latitude, which is the angular distance north or south of the equator.
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What is the purpose for the analemma?
The analemma shows the position of the sun in the sky over the course of a year, accounting for variations in the Earth's orbit and axial tilt. It provides information about the sun's declination and the equation of time, which are important for accurate timekeeping and astronomical observations.
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Is the analemma is a useful tool for locations north of the Tropic of Capricorn?
No, the analemma is a figure-eight shaped curve that shows the position of the Sun in the sky at a specific location at the same time of day throughout the year. For locations north of the Tropic of Capricorn, the analemma is not as useful because the Sun's path in the sky is closer to directly overhead during certain times of the year, making the figure-eight shape less pronounced.
Does the analemma determine how far a country is located from the equator?
No, the analemma is a figure-8-shaped diagram representing the declination of the Sun. It shows the variation of the Sun's position in the sky throughout the year. The distance of a country from the equator is determined by its latitude, which is the angular distance north or south of the equator.
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