line of sight

noun

Also called line of sighting. an imaginary straight line running through the aligned sights of a firearm, surveying equipment, etc.

Astronomy. an imaginary line from an observer to a celestial body, coincident with the path traveled by light rays receivedfrom the body.

Radio. a straight line connecting two points sufficiently high and near one another so that the line is entirely above the surface of the earth.

Ophthalmology. line of vision.

sightline.

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Origin:
1550–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Line of sight is always a great word to know.

So is Leo. Does it mean:

the brightness of a star in comparison with that of the sun: the luminosity of Sirius is expressed as 23 and indicates intrinsic brightness 23 times greater than the sun

the Lion, a zodiacal constellation between Virgo and Cancer, containing the bright star Regulus

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Collins

World English Dictionary

line of sight

—n
1.	the straight line along which an observer looks or a beam of radiation travels
2.	ophthalmol another term for line of vision

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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"Museums and art stores are also sources of pleasure and inspiration. Doubtless it will seem strange to many that the hand unaided by sight can feel action, sentiment, beauty in the cold marble; and yet it is true that I derive genuine pleasure from touching great works of art. As my finger tips trace line and curve, they discover the thought and emotion which the artist has portrayed."

-Helen Keller