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they navigated by trades and by the stars.
They used maps and navigated by the stars, sun and moon.
The term binary is applied to a number of different things, such as binary stars, binary numbers, or binary chemical agents. Your question should be more specific.
Yes, each level of Angry Birds has 3 stars. You can achieve 3 stars by destroying the constructions and pigs with as little amount of birds as possible. The more points you get the better chance you get the 3 stars. Hope that helps!
Astrologers and Scientists (especially studying physics) look at the stars
Knocking all the birds
the light radiated from the stars
planes birds stars and what not
spectrographs
the orbits of binary stars
determine which stars are gravitationally bound to each other
young stars are found to have hot disks that surround them.