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The major axis of an ellipse is its longest diameter, a line that runs through the center and both foci, its ends being at the widest points of the shape.

The semi-major axis is one half of the major axis, and thus runs from the centre, through a focus, and to the edge of the ellipse. It represents a "long radius" of the ellipse, and is the "average" distance of an orbiting planet or moon from its parent body.

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11y ago
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14y ago

The distance from one of the foci to the center of the ellipse divided by the eccentricity.

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Q: What is also known as the semimajor axis?
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What is a semimajor axis of an ellipse?

The major axis is the diameter across the widest part. The semimajor axis is half that, and for a planet it's the average of the maximum and minimum distances from the Sun .


If a semimajor axis is 2.77au what is period of Ceres years?

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What is the semimajor axis of a circle of diameter 24 cm?

The major and minor axes of a circle are the same - either is any diameter. So a semimajor axis is half the diameter which is 12 cm.


How do Kepler's 3 laws of motion combined with the parts of an ellipse explain the amount of time it takes for a planet to orbit the sun based on its length?

One of the parts of an ellipse is the length of its major axis. Half that is called the semimajor axis. Kepler's 3rd law says that the time to do one orbit is proportional to the 3/2 power of the semimajor axis. IF the semimajor axis is one astronomical unit the period is one year (the Earth). For a planet with a semimajor axis of 4 AUs the period would have to be 8 years, by Kepler-3.


How do Keplers 3 laws of motion combined with the parts of an ellipse explain the amount of time it takes for a planet to orbit the sun based on its length?

One of the parts of an ellipse is the length of its major axis. Half that is called the semimajor axis. Kepler's 3rd law says that the time to do one orbit is proportional to the 3/2 power of the semimajor axis. IF the semimajor axis is one astronomical unit the period is one year (the Earth). For a planet with a semimajor axis of 4 AUs the period would have to be 8 years, by Kepler-3.


The period of revolution is related to?

the period of revolution is related to the semimajor axis.... :)


What does the semimajor axis of a planet with a period of 12 earth years measure?

That can be calculated from Kepler's 3rd law which says if the period is T years the semimajor axis must be T2/3 astronomical units. So for a period of 12 years the s/m axis is 5.421 AU or 784 million km.


What is another name for a horizontal axis on a graph?

The horizontal axis is also known as the 'X' axis. The vertical axis is also known as the 'Y' axis.


Where is Makemake located in the solar system?

Its average distance from the Sun (to be more precise, its semimajor axis) is about 46 AU.


What is y-Axis also known as?

The vertical axis


Is the horizontal axis also called the value axis?

False! the vertical axis ( y axis) is the one also known as the value axis


Why does mercury orbit the sun first?

(I'm going to assume that when you said "first" you meant "fastest," because otherwise the question is nonsense.) Because of Kepler's Third Law. The orbital period for a body is related to the semimajor axis of its orbit. Mercury's orbit has the shortest semimajor axis of all the Solar planets, and therefore it has the shortest orbital period.