Glossary term: Altitude

Description: In a horizontal coordinate system, altitude refers to how high an object is from the horizon. It is measured in degrees. An object on the horizon would have an altitude of 0 deg. and an object that is directly overhead would have an altitude of 90 deg. Negative values of altitude would mean the object is currently below the horizon. In geography, the altitude (measured in length units such as meters) is a measure of how high a place is from the mean sea level.

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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".