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Help me understand this worked solution! (ellipse)(+rep)

There is an orbit of a Star viewed from Earth.

Use the following information to find the mass of the central object.

Period: 15.2 years
Inclination: 46 degrees
Eccentricity: 0.87
Semimajor Axis: 0.119"
Distance: 8Kpc

These are (I think) the values measured.

He converts the 0.119" into metres = 1.4 x 10^14m

But then in Keplers third law, instead of using 1.4 for the semi-major axis, he uses 2.3.

I assume this is because of the inclination, but I can't work out how to get to the 2.3

Thanks

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