## Horizon |

The **horizon** or **skyline** is the apparent line that separates *true horizon* is actually a theoretical line, which can only be observed when it lies on the sea surface. At many locations, this line is obscured by land, trees, buildings, mountains, etc., and the resulting intersection of earth and sky is called the *visible horizon*. When looking at a sea from a shore, the part of the sea closest to the horizon is called the **offing**.^{[1]}

The true horizon is horizontal. It surrounds the observer and it is typically assumed to be a circle, drawn on the surface of a perfectly spherical model of the ^{[2]}

When observed from very high standpoints, such as a

The word *horizon* derives from the *horizōn kyklos*, "separating circle",^{[3]}, where "ὁρίζων" is from the verb ὁρίζω *horizō*, "to divide", "to separate",^{[4]} which in turn derives from "ὅρος" (*oros*), "boundary, landmark".^{[5]}

- appearance and usage
- distance to the horizon
- curvature of the horizon
- vanishing points
- see also
- references
- further reading
- external links

Historically, the distance to the visible horizon has long been vital to survival and successful navigation, especially at sea, because it determined an observer's maximum range of vision and thus of

In many contexts, especially *geometrical horizon* (which assumes a perfectly flat, infinite ground plane) and the *true horizon* (which assumes a ^{[dubious – discuss]} (but for someone on a 1000-meter hill looking out to sea the true horizon will be about a degree below a horizontal line).

In astronomy the horizon is the horizontal plane through the eyes of the observer. It is the

Other Languages

العربية: أفق

asturianu: Horizonte

Aymar aru: Chhaqachhaqa

azərbaycanca: Üfüq

বাংলা: দিগন্ত

Bân-lâm-gú: Tē-pêng-sòaⁿ

беларуская: Гарызонт

беларуская (тарашкевіца): Гарызонт

български: Хоризонт

བོད་ཡིག: ས་ངོས་སྙོམས་ཐིག

bosanski: Horizont

brezhoneg: Dremmwel (fizik)

català: Horitzó

čeština: Obzor

Cymraeg: Gorwel

dansk: Horisont (geografi)

Deutsch: Horizont

eesti: Horisont

Ελληνικά: Ορίζοντας

español: Horizonte

Esperanto: Horizonto

euskara: Ostertz

فارسی: افق

français: Horizon (physique)

Gaeilge: Léaslíne

Gàidhlig: Fàire

galego: Horizonte (xeografía)

한국어: 지평선

հայերեն: Հորիզոն

हिन्दी: क्षितिज

hrvatski: Obzor

Ido: Horizonto

বিষ্ণুপ্রিয়া মণিপুরী: হোরিজোন্টে

Bahasa Indonesia: Cakrawala

íslenska: Sjóndeildarhringur

italiano: Orizzonte

עברית: אופק

ಕನ್ನಡ: ಕ್ಷಿತಿಜ

ქართული: ჰორიზონტი

қазақша: Көрінетін көкжиек

Kiswahili: Upeo wa macho

Кыргызча: Горизонт

Latina: Finitor

latviešu: Horizonts

Lëtzebuergesch: Horizont

lietuvių: Horizontas

Limburgs: Horizon

magyar: Horizont

македонски: Хоризонт

मराठी: क्षितिज

მარგალური: ჰორიზონტი

مصرى: افق

Bahasa Melayu: Ufuk

မြန်မာဘာသာ: မိုးကုတ်စက်ဝိုင်း

Nederlands: Horizon (lijn)

नेपाल भाषा: कुलां

日本語: 地平線

нохчийн: Ана

norsk: Horisont

norsk nynorsk: Horisont

occitan: Orizont

олык марий: Каватӱр

oʻzbekcha/ўзбекча: Ufq

ਪੰਜਾਬੀ: ਦੁਮੇਲ

polski: Horyzont

português: Horizonte

română: Orizont

Runa Simi: Pachapanta

русский: Горизонт

саха тыла: Саҕах

Scots: Easins

shqip: Horizonti

Simple English: Horizon

slovenčina: Obzor (Zem)

slovenščina: Obzorje

српски / srpski: Хоризонт

srpskohrvatski / српскохрватски: Horizont

Basa Sunda: Sisi langit

suomi: Horisontti

svenska: Horisont

Tagalog: Abot-tanaw

தமிழ்: தொடுவானம்

ไทย: ขอบฟ้า

Türkçe: Ufuk

українська: Горизонт

اردو: افق

Tiếng Việt: Chân trời

Volapük: Horit

Winaray: Panganoron

吴语: 地平线

粵語: 地平線

中文: 地平線