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Is the calculator at the following page you are looking for (&quot;Calculate Circumference of the Earth at a given Latitude&quot;)?:<br />
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&lt;&nbsp;<a href="http://www.easysurf.cc/circle.htm#cetol1" rel="ugc">http://www.easysurf.cc/circle.htm#cetol1</a> &gt;
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Is the calculator at the following page you are looking for ("Calculate Circumference of the Earth at a given Latitude")?:

< http://www.easysurf.cc/circle.htm#cetol1 [http://www.easysurf.cc/circle.htm#cetol1] >

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That is using the correct formula I would assume (but it could be working with the fact the earth is not a sphere), but I need to input the diameter of my own sphere.
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That is using the correct formula I would assume (but it could be working with the fact the earth is not a sphere), but I need to input the diameter of my own sphere.

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Assume perfect circle.<br />
<br />
Formula: C = 2 pi r cos(x), <br />
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where pi = 3.14159..., r = the earth's equatorial radius = 6378 km, and x is the angle of latitude.
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Assume perfect circle.

Formula: C = 2 pi r cos(x),

where pi = 3.14159..., r = the earth's equatorial radius = 6378 km, and x is the angle of latitude.

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The formula: C (&quot;diameter of the circle created by a parallel&quot;) = 2 pi r cos(x).<br />
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2 pi r = 96 in your case. <br />
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You can use the formula for all &quot;degree of latitude&quot; and &quot;spheres&quot; of all sizes. &nbsp;:-)
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The formula: C ("diameter of the circle created by a parallel") = 2 pi r cos(x).

2 pi r = 96 in your case.

You can use the formula for all "degree of latitude" and "spheres" of all sizes.  :-)

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C = Circumference = pi * Diameter
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I have a wire frame sphere with a diameter of 96 units. &nbsp;I need a math pro to show and explain the formula to calculate the diameter of the circle created by a parallel at a certain degree of latitude. &nbsp;For your example please use 30 degrees. &nbsp;If you find a web page that has a calculator for this on it, that would be good enough also.
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I have a wire frame sphere with a diameter of 96 units.  I need a math pro to show and explain the formula to calculate the diameter of the circle created by a parallel at a certain degree of latitude.  For your example please use 30 degrees.  If you find a web page that has a calculator for this on it, that would be good enough also.

How do you calculate parallel radius on a sphere.

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