下载文件 ( 图像 214.47 kB)
下载 PDF 文件 (PDF file 88.40 kB)

Also available in black and white
下载文件 ( 图像 272.39 kB)
下载 PDF 文件 (PDF file 88.60 kB)

图示说明： 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.

图示来源： Maria Cristina Fortuna/IAU OAE.

图示翻译状态: 尚未由审核人员批准
图示授权许可： 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 知识共享许可协议 署名 4.0 国际 (CC BY 4.0) 图标

相关术语表词条： 世界时（UT） , 国际日期变更线 , 时区 , 本初子午线
分类： 天文学与社会 , 地球

Want to make your own translation or version of this diagram? Then download the SVG version of this diagram in English (174.25 kB). You can edit this using software like Inkscape (free) or Adobe Illustrator (proprietary). Just remember to credit the author of the original appropriately. Also available in black and white ( 图像 174.25 kB).

You can also make your own version or translation of this diagram by adding adding text to a version of this diagram with no text. Just download one of the following files:
Download Text-Free File ( 图像 192.66 kB)
Download Text-Free PDF File (PDF file 83.98 kB)
Also available in black and white:
Download Text-Free File ( 图像 252.36 kB)
Download Text-Free PDF File (PDF file 84.19 kB)

其他语言版本