$\"\"$

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The mean distance of mars from the sun is $\"\"$ .

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The length of the major is axis is $\"\"$ .

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The aphelion of mars is $\"\"$ .

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The aphelion of mars is $\"\"$ .

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The distance form the center of the ellipse to the sun (focus) is $\"\"$ .

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The equation of the orbit is $\"\"$ , where $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$ .

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The equation for the orbit is $\"\"$ , where $\"\"$ be in millions of miles. $\"\"$

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The equation for the orbit is $\"\"$ , where $\"\"$ be in millions of miles.