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A parallax is a change in apparent position, when YOU move. In astronomy, it usually refers to the change in the apparent position of a star, due to Earth's orbit around the Sun. It's there, whether you "use" it or not, but it is quite useful to determine distances of stars that are relatively close to us - since the farther a star is, the smaller will the parallax be. Even for the nearest star after the Sun, the parallax is smaller than one second (1/3600 of a degree).

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What is a parallax and what is it used for?

parallax is a planet


What is parallax bar used for?

Parallax bars are used in photogrammetry and remote sensing. with the use of the principles of parallax and refraction, parallax bars are used to measure the heights of buildings and other features.


What can parallax be used to determine about a star?

Parallax is a method used to find the distances of stars.


When was parallax first used?

In 1672


Is parallax a star?

The parallax refers to the apparent change in the star's position, due to Earth's movement around the Sun. This parallax can be used to measure the distance to nearby stars (the closer the star, the larger will its parallax be).


What is a parallax bar used for?

A parallax bar is used in surveying to measure horizontal distances and elevations. It typically consists of a bar with two telescopes at each end that can be used to accurately measure distances by taking line of sight readings.


When can parallax not be used?

Paralax can not be used during an eclise


Why was Galileo so interested in parallax?

He was on to a brilliant idea about how parallax can be used to estimate some astronomical distances.


How is a parallax used in astronomy?

for determining distance


How is parallax used in computer programming?

Parallax is used in computer programming by using a computer and a USB connection. They have been popular in robotics because of their easiness to program.


Why can't the parallax effect be used to measure distances to other galaxies?

The parallax angle of such distant objects is way too small to be measured. In general, the farther away an object, the smaller is its parallax angle.


What is parallax bar?

Parallax bar is a device used in surveying to measure the horizontal distance between two points by creating a visual displacement of a point viewed through a telescope on a graduated rod. This displacement is used to calculate the distance based on the principle of parallax. It is commonly used in topographic mapping and land surveying.