Question

Parallax angle and parallactic angle 1 physics

Answer 1

Parallactic angle - In spherical astronomy, the parallactic angle is the angle between the great circle through a celestial object and the zenith, and the hour circle of the object. ... Despite its name, this angle is unrelated with parallax. The parallactic angle is zero when the object crosses the meridian.

Parallax angle - The parallax angle is the angle between the Earth at one time of year, and the Earth six months later, as measured from a nearby star. Astronomers use this angle to find the distance from the Earth to that star.