An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Relating to or used in → trigonometry. → trigonometric function.

→ trigonometry; → -ic.

A function of an angle, one of six functions (sine, cosine, tangent, cotangent, secant, and cosecant) that represent ratios of sides of right triangles. Also called circular function.

→ trigonometric; → function.

The → parallax of a nearby star (less than 300 → light-years) against the background of more distant stars resulting from the motion of the Earth in its orbit around the Sun.

→ trigonometric; → parallax.