Glossary term: 國際日期變更線
Description: 國際日期變更線是一條特定的子午線，大致沿著經度 180° 的子午線。國際日期變更線自北向南穿過俄羅斯與阿拉斯加之間，穿過包括密克羅尼西亞和波利尼西亞部分地區的太平洋，以及澳大利亞/新西蘭東部，最後到達南極洲的南極點。國際日期變更線標誌著日曆日期變化一天的邊界。因此，國際日期變更線以西的地區比以東的地區早一天。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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In Other Languages
- 阿拉伯語: خط التاريخ الدولي
- 德語: Datumsgrenze
- 英語: International Date Line
- 法語: Ligne internationale de changement de date
- 義大利語: Linea Internazionale del cambio di Data
- 日語: 国際日付変更線 (external link)
- 韓語: 국제날짜변경선
- 巴西葡萄牙語: Linha Internacional de Data
- 簡體中文: 国际日期变更线
Related Diagrams
International Date Line
Caption: 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.
Credit: Maria Cristina Fortuna/IAU OAE
License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
