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Glossar-Begriff: Datumsgrenze

Beschreibung: Die Datumsgrenze ist ein Meridian, der ungefähr dem 180. Längengrad folgt. Die Datumsgrenze verläuft in Nord-Süd-Richtung zwischen Russland und Alaska, durch den Pazifischen Ozean einschließlich Teilen von Mikronesien und Polynesien und östlich von Australien/Neuseeland, bevor sie den Südpol in der Antarktis erreicht. Die Datumsgrenze markiert die Grenze, an der sich der Kalendertag um eins ändern. Daher sind die Regionen westlich der Datumsgrenze den Regionen östlich davon um einen Kalendertag voraus.

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Begriffs- und Definitionsstatus Die Originaldefinition dieses Begriffes auf Englisch wurden von einem forschenden Astronom und einer Lehrkraft bestätigt
Die Übersetzung dieses Begriffs und seiner Definition warten auf Prüfung und Bestätigung

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".

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Ähnliche Diagramme


A map of the Earth with 24 vertical timezones. The International Date Line runs between Russian and Alaska and bisects the Pacific

International Date Line

Unterschrift: The International Date Line (shown here as a solid line) is a specific meridian which roughly follows the meridian of longitude 180°. The International Date Line passes north–south between Russia and Alaska, through the Pacific Ocean including parts of Micronesia and Polynesia, and to the east of Australia/New Zealand before reaching the South Pole on Antarctica. The International Date Line marks the boundary where calendar dates change by one. Therefore, regions to the west of the International Date line are one calendar day ahead of regions to the east. The International Date Line does not always exactly follow the meridian of longitude 180°. This is partly to stop some territory of a country falling on the other side of the International Date Line than the rest of that country (the Aleutian Islands in the United States being a good example). Some countries also choose which side of the International Date Line they lie on. Samoa changed which side of the date line it lay on in 2011. At this point the International Date Line was moved to lie to the east of Samoa having previously passed to the west of Samoa. On the opposite side of the world the dashed line marks the prime meridian (the meridian of longitude 0°). This is a line that passes through the Royal Greenwich Observatory in the UK. All time zones are measure relative to Universal Time which is the zero point for all timezones. The time zones marked at the top of the diagram are the timezones in the shaded regions excluding the effects of daylight savings time.
Bild: Maria Cristina Fortuna/IAU OAE

License: CC-BY-4.0 Creative Commons Namensnennung 4.0 International (CC BY 4.0) Symbole