Glossary term: 근일점
Description: 태양계 대부분의 천체는 타원 궤도를 가지며, 태양은 초점 중 하나에 위치합니다. 근일점은 궤도를 따라 공전하는 천체가 태양에 가장 가까운 지점입니다. 수학적으로 이 지점은 타원의 장축의 한쪽 끝을 나타냅니다. 여기서 "근점"은 가장 가까운 지점을, "일"은 태양을 의미합니다. 따라서 이 단어는 중심 천체가 태양일 때만 사용할 수 있습니다. 중심 천체가 태양이 아닌 별일 때는 "근성점"이라고 하고, 공전하는 중심 천체가 지구일 때는 "근지점"라고 합니다. 중심 천체와 관계없이 일반적인 용어는 "근점"입니다.
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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
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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In Other Languages
- 아랍어: الحضيض الشمسي
- 독일어: Perihel
- 영어: Perihelion
- 프랑스어: Périhélie
- 이탈리아어: Perielio
- 일본어: 近日点 (external link)
- 중국어 간체: 近日点
- 중국어 번체: 近日點
Related Media
Halley's Comet
Caption: Halley’s Comet, is a well-known periodic comet, named after the English astronomer Edmond Halley. It has an orbital period of approximately 75 years and is visible from Earth with the naked eye when it passes through the inner solar system.
The image shows Halley’s Comet, officially designated 1P/Halley, with a tail of gas and dust streaming away from the Sun. It was taken from the La-Silla-Observatory in Chile in 1986 during Halley's Comet's last visit to the inner solar system. The stars in this image appear elongated or as lines of three different colored dots as image was created from three separate observations in different colors of light and the telescope was tracking the comet, which was moving very slightly compared to the background stars. Note that the comets tail does not point in exactly the same direction as the elongation of the stars. This shows us that the comet tail is not always behind the comet, but instead pointing away from the Sun.
The comet passes its perihelion (closest distance to the Sun) at a distance of around 0.59 astronomical units, right between the orbits of Mercury and Venus. Beyond Neptune, it reaches its aphelion (furthest distance from the Sun) at a distance of approximately 35 astronomical units. Halley's Comet reached aphelion in December 2023 and is now moving inwards again. It is expected to be seen with the naked eye from Earth again in mid-2061.
Credit: ESO
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