Re: [nbos] Star Chart Base Data Release."Cam Kirmser" Mon Jun 13th, 2011> Any chance of getting the calculations you used for x,y,z from the RA/Dec?

You need more than RA/Dec; you also need the parallax - or, some other way

to get the distance from Sol. Then, with RA, Dec and the Distance (R), you

can derive X, Y and Z.

The formulas are;

X = R × cos(Dec) × cos(RA)

Y = R × cos(Dec) × sin(RA)

Z = R × sin(Dec)

Now, remember, if you use Excel for these conversions, you have to convert

the angles to degrees. Excel's trig functions are based on Radians.

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