Glossary term: 极圈
Description: 极圈是地球上两条特定的纬线圈。位于北纬66°33′48.8″的极圈称为北极圈，位于南纬66°33′48.8″的极圈称为南极圈。由于地球自转轴是倾斜的，北极圈以北和南极圈以南地区的冬季为“极夜”，夏季为“极昼”。极夜期间，太阳在地平线以下的时间超过24小时，暗夜可持续数月。极昼期间，太阳在地平线以上的时间超过24小时，白昼可持续数月。越靠近极点，则极昼和极夜最长。对于每个极地区域，极夜出现在冬至前后，极昼出现在夏至前后。
Related Terms:
See this term in other languages
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
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".
Related Media
当太阳反弹时
Credit: Milos Obert/IAU OAE (CC BY 4.0)
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
日食钟——极昼中的日食
Credit: Stephanie Ziyi Ye/IAU OAE (CC BY 4.0)
License: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
Related Activities
Discover Earth's climate with a balloon
astroEDU educational activity (links to astroEDU website) Description: Discover the secrets of Earth's climate zones with a hands-on experienceLicense: CC-BY-4.0 Creative Commons 署名 4.0 国际 (CC BY 4.0) icons
Age Ranges: 8-10 , 10-12 Education Level: Middle School , Primary Areas of Learning: Fun activity , Guided-discovery learning , Modelling , Observation based , Project-based learning , Social Research Costs: Low Cost Duration: 45 mins Group Size: Group Skills: Asking questions , Constructing explanations , Developing and using models
