Glossary term: Parallax

Description: Parallax is the apparent change in position of an object, such as a star, due to the change in the observer’s point of view. Astronomers typically use the change in the position of Earth during the year to measure parallax. If observations are made six months apart, Earth has changed position by two times the length of the astronomical unit – see also ‘Annular Parallax’.

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The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".