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مصطلح في المعجم: القوس

ويُعرف أيضًا باسم برج القوس

الوصف: القوس هو أحد الأبراج في دائرة البروج، أي أن النجوم التي تُكوِّن هذه الكوكبة تقع في الجزء من السماء الذي يتقاطع مع مسير الشمس (المستوى الذي يُحدِّده مدار الأرض حول الشمس). ومن ثَمَّ، يمكننا أن نجد الشمس بانتظام من الأرض وكذلك الكواكب الأخرى في المجموعة الشمسية في كوكبة القوس. في حالة الشمس يحدث هذا من أواخر كانون الاول/ديسمبر إلى أوائل كانون الثاني/يناير (في ذلك الوقت، بالطبع، لا يمكننا رؤية نجوم الكوكبة). القوس هو أحد الكوكبات ال 88 الحديثة التي حددها اتحاد الفلك الدولي، لكنه يعود إلى أبعد من ذلك بكثير - فقد كان أحد الكوكبات ال 48 التي سماها عالم الفلك كلوديوس بطليموس في القرن الثاني.
تتميز كوكبة القوس بأنها الموقع الذي يوجد فيه مركز مجرتنا درب التبانة، وكذلك الثقب الأسود فائق الكتلة المعروف باسم القوس A*.

مصطلحات ذات صلة:



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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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وسائط ذات صلة


صورة  مجرة درب التبانة  مقوسة فوق أرض عشبية أفريقية. ويظهر توهجها المنتشر متقاطعا مع تيار من البقع الداكنة.

قوس درب التبانة فوق حديقة أمبوسيلي الوطنية

الشرح: الصورة الفائزة في مسابقة التصوير الفلكي لعام 2022 IAU OAE ، فئة الصور الثابتة للأنماط السماوية. التقطت هذه الصورة في يوليو 2016 من حديقة أمبوسيلي الوطنية في كينيا ، وتقع بالقرب من خط الاستواء. في الأساطير المصرية من شمال إفريقيا ، ارتبطت درب التبانة بنهر أبحر به الآلهة والأرواح. يفسر الزولو في جنوب إفريقيا هذا النمط من السحب الداكنة والمشرقة للنجوم على أنه حيوان ذو بشرة سوداء وبيضاء ، في حين اعتبره خويخوي وسان الجنوب أفريقيين "طريق النجوم". في العديد من ثقافات جنوب إفريقيا ، يعتبر قوس درب التبانة طريقًا إلى السماء شكلته إلهة أم ، وفقًا لأسطورة الخلق في جنوب إفريقيا التي تم تبنيها في القرن التاسع عشر من الأبحاث الإثنولوجية المبكرة ، ولكنها اختفت اليوم. في منتصف يمين الصورة ، نجد النجم الأحمر الساطع قلب العقرب في الكوكبة الحديثة للعقرب وفي الحافة اليسرى العلوية توجد النجمة البيضاء فيغا التي تعتبر ذكر ستينبوك من قبل الشعوب المحيطة بكيب تاون. الأستراليون الأصليون لديهم العديد من الأسماء لمجرة درب التبانة. يشير سكان Yolnu في Arnhem Land في الإقليم الشمالي بأستراليا إلى درب التبانة باسم Milnguya ، نهر السماء. يرتبط أحد الأنماط البارزة في هذه الصورة بالتباين بين المناطق الفاتحة والمظلمة في مجرة درب التبانة. هذه المناطق المظلمة عبارة عن غيوم كثيفة باردة من الغبار والغاز بين النجوم ، والتي تحجب الضوء من النجوم خلفها. أحد الأنماط البارزة هو نمط السماوية Emu الذي يشار إليه باسم Tchingal من قبل العديد من الشعوب الأصلية في جنوب أستراليا. يقع رأس ومنقار emu (سديم Coalsack) في أسفل يسار الصليب الجنوبي (يُرى في أقصى أسفل يمين الصورة) ، ويمتد الجسم والساقين منه إلى اليسار. تربط مجموعات السكان الأصليين الأخرى المناطق المظلمة بالكهوف أو الممرات المائية. يوفر اتجاه emu على مدار العام أدلة مهمة حول الوقت المناسب لاختيار بيض emu ، ومتى يفقس البيض. في بعض الأشهر ، عندما تكون غيوم مجرة درب التبانة هذه قريبة من الأفق ، فإنها لا تُعتبر على أنها إيمو على الإطلاق بل كتمساحين زاحفين. الشكل الحديث لسديم الأنبوب المظلم مرئي بوضوح فوق مركز المجرة. يصل دخان هذا الأنبوب إلى منطقة rho Ophiuchi الملونة بجوار Antares في Scorpius ، النجم البرتقالي والأحمر فوق مجرة درب التبانة. يُشار إلى أنتاريس من قبل شعب Boorong باسم Djuit ، الببغاء ذو الردف الأحمر ، بينما يشير شعب Kokatha في الصحراء الغربية إلى Antares باسم Kogolongo ، الكوكاتو الأسود ذو الذيل الأحمر. بالإضافة إلى ذلك ، يمكن رؤية بعض الأبراج البارزة: Cygnus و Aquila و Lyra و Scorpius و Sagittarius و Crux و Centaurus. يتم تفسير نجوم المؤشر ، Alpha و Beta Centauri ، أحيانًا على أنهما عيون الوحش في بعض تقاليد جنوب إفريقيا. بالإضافة إلى ذلك ، يمكن رؤية بعض الأبراج البارزة: Cygnus و Aquila و Lyra و Scorpius و Sagittarius و Crux و Centaurus. يتم تفسير نجوم المؤشر ، Alpha و Beta Centauri ، أحيانًا على أنهما عيون الوحش في بعض تقاليد جنوب إفريقيا.
المصدر: أميرريظا كامكار / IAU OAE

المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات CC-BY-4.0 :License


سماء مرصعة بالنجوم وضوء متوهج من مجرة درب التبانة يظهر خلف هرم مدرج من الطوب اللبن.

ذراع المجرة

الشرح: صورة تذكارية من مسابقة التصوير الفلكي لعام 2022 والتي ينظمها مكتب تعليم الفلك التابع للاتحاد الدولي الفلكي، فئة الصور الثابتة ذات خلفيات سماوية. التقطت هذه الصورة من جنوب العراق في كانون الثاني (يناير) 2022 ، وتُظهر سماء صافية فوق أحد المعالم الأثرية العديدة في المنطقة والتي تشبه الزقورة البابلية. اخترع السومريون هذه المباني الشبيهة بالجبال حتى قبل اختراع النصوص حيث ظهرت الزقورات المبكرة قبل 4000 عام تقريبًا من الحقبة الحالية (التقويم الحالي). تبدو هذه الزقورة كفجوة الهرم وفي العصور البابلية غالبًا ما كان سعلوها معابد. في الجزء المقابل لدَرج الزقورة ، تظهر كويكبات الجزء الجنوبي من دائرة البروج، والتي إكتشفهاأيضًا البابليون. تعرف هذة الكويكبات (الأبراج) بـ برج الجدي (يسارًا ، به كوكب) والقوس (الرامي) ، الذي تظهر نجومه اللامعة على شكل إبؤيق الشاي. بالنسبة للبابليين ، كان القوس هو الإله بابلسانغ ، إله مدينة لاراك وإله الزراعة والحرب. كانوا يعتبرونه أيضًا إلاهاً للإلهة الطب ،ويسمونة جولا ، وهيئتة على شكل مخلوق هجين يحمل قوسًا وسهمًا: ذا جذع بشري ورأس متصل بجسم حصان بأربعة أرجل ، وجناحان عملاقان وذيلان. - ذيل حصان وذيل عقرب. لم يكن مثل هذا المخلوق موجودًا في الأساطير اليونانية ، لذلك اختصره الإغريق إلى شيء يعرفونه ، القنطور الذي يحمل القوس والسهم. على الرغم من ذلك، تُعد هذه الصورة غير منطقية في الثقافة اليونانية لأن القنطور كان يعتبر وحشيًا وقاسيًا ، وليس ذكيًا بما يكفي لاستخدام القوس والسهم. لذلك ، كان هناك شخصية (تشبيه) يونانية أخرى موجودة في ذات الوقت: ألا وهو رجل ذو حوافر بدلاً من أقدام في نهايات ساقيه ، وأذن وذيل حصان، لكن هذا التصور لم يعد موجودا في العصر الروماني. برج (كوكبة) الجدي هو أحد أكثر الكويكبات استقرارًا من ناحية الشكل في دائرة البروج ولم يتغير على مدى آلاف السنين. تم تَخيُلهُ على أنه مخلوق هجين بحيث يُشبه الجزء الأمامي الماعز والجزء الخلفي السمكة. هذه الكوكبة عرفت منذ قديم الزمن على يد البابليين باسم كوكبة الجوت-فيش (Goat-Fish). في العقيدة البابلية ، هو بمثابة الشيطان حسن النية الذي يحمي البشر ويشفيهم ويصاحب إله الحكمة والسحر. لقد تبنى الإغريق هذة العقيدة واخترعوا قصة لها. إشتهرت هذة القصة وهذة الكوكبة في العصر الروماني بشكل كبير حيث إتخذها إمبراطور روما أوغسطس كرمز شخصي، وطبعها أيضًا على العملات المعدنية وأدوات الدعاية السياسية الأخرى. في كوكبة القوس او الرامي كما ذكرنا، يمكن أن نلاحظ تكتل لامع من النجوم (يشبة الإنتفاخ) , والذي يرمز الى مركزمجرتنا درب التبانة. هذا التكتل بالكاد يظهر في الصورة ، وذلك نتيجة تأثير الحضارة الحديثة والتلوث الضوئيالناتج عن إستخدامنا الخاطئ للأضواء الاصطناعية. ينعكس هذا الضوء ويتششت في السماء ليلاً مما يجعل من المستحيل رؤية درب التبانة في المناطق التي يعيش فيها البشر.
المصدر: رقيه محمد/ الاتحاد الدولي الفلكي-مكتب تعليم الفلك

المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات CC-BY-4.0 :License


The diffuse glow of the Milky Way broken by dark patches. Right, the red star Antares forms the top of a hook-like pattern

Milky Way Arch over La Palma

الشرح: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   This image, which shows the majestic band of the Milky Way and a range of culturally significant patterns, was taken in May 2022 at a very high altitude from the Roque de los Muchachos Observatory in La Palma, from which one can see the clouds below. Some prominent star patterns include Scorpius, Sagittarius, Lyra, Cygnus, Aquila, the Summer Triangle asterism, and the Teapot asterism. As the Canary Islands used to be a starting point for European sailors to explore the world, we use this place to point to the many indigenous cultures they encountered. Most notably it is the dark patterns within the band of the Milky Way that hold significance for many Indigenous cultures around the world. The dark patterns are in fact dense, cool clouds of gas and dust that block the light from stars. Indigenous people see caves, waterways and various patterns associated with the dark regions of the Milky Way. The constellations and patterns hold different cultural significance and interpretations for different people. For example, the constellation Scorpius is referred to by Polynesian people as the demigod Maui’s Fishhook. The Yolnu people of Arnhem Land associate Scorpius with a crocodile called Ingalpir. Some Indigenous Australian groups associate stories with individual stars within Scorpius, most notably Antares, the orange-red star in the top right of the image above the band of the Milky Way. Next to the Scorpion and above the bright centre of the Milky Way, there is a prominent dark cloud that is called the Pipe Nebula by modern astrophotographers. The smoke of this pipe goes up to rho Ophiuchi. This and all the other dark clouds in the Milky Way together form the backbone of heaven for some tribes, and an animal with black-and-white skin for South African Zulu people. The nomenclature of bright stars also has cross-cultural roots. For example, Vega (the bright blue star towards the top of the image) comes from the Arabic waqi, from al-nasr al-waqi, the Eagle who throws himself down (in order to hunt). This contrasts with the Flying Eagle, Altair, also derived from Arabic. Antares is a Greek word meaning “the one similar to Mars”, referring to its colour. The star name Shaula in the stinger of the Scorpion is a modern version of the Babylonian or even Sumerian star name.
المصدر: Amirreza Kamkar/IAU OAE

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


The Milky Way arches over a mountain-top building. Its diffuse glow is broken by dark patches and is brighter on the right

The Moon and Milky Way arch Above the Golden Hall

الشرح: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   Taken in April 2021 from the top of the Laojun Mountain in China, this image shows a panoramic view of the Milky Way over the Golden Hall called “Yuhuangding” as a symbol of wealth. In China, the Milky Way is considered a huge stream like one of the big rivers. It separates the Cowherd (Altair) and his beloved Weaving Girl (Vega) and it has a Celestial Ford in the northern dark cloud in the modern constellation Cygnus. The Milky Way appears as a whitish arch as we cannot distinguish all the individual stars, but instead see the accumulation of light from them. It is a disc-shaped galaxy and the Solar System is located within one of its spiral arms, so we see it from inside, which gives it the shape of a band in our sky. It is associated with the religions and mythologies of several cultures. The modern term Milky Way derives from Greek folklore as the milk spread in the sky by the mother goddess Hera, when she unwillingly breastfed young Heracles. This son of Zeus and a mortal woman was put next to her while she was asleep but from his strong sucking she woke up and realised she was feeding an unknown child, and immediately pushed the child away. Greek philosophers like Plato considered the glittering band in the sky to be the traces of a former path of the Sun. Alternatively, for the Tupi-Guarani indigenous mythology from South America, the Milky Way represents the “path of tapir”. For some Australian native peoples, its dark clouds formed the shape of an emu if high in the sky, and of crocodiles if low on the horizon. For many southern African, South American and Australian cultures, it was considered a pathway to or from heaven. At the right edge of the image, we can recognise the modern constellation Scorpius with its most prominent star, Antares, the reddish star just above the Milky Way. The brightest point seen in the centre bottom of the image is the rising Moon with Jupiter next to it. A few constellations can be distinguished in this image, including Corona Australis, a faint arc-shaped constellation located to the bottom right. Just above the Southern Crown, we can see the Teapot asterism as part of the Sagittarius constellation. Since Sagittarius lies next to the centre of the Milky Way, many structures such as star-forming regions, globular clusters and planetary nebulae can be found within its boundaries. In Sagittarius, we also find a supermassive black hole four million times as massive as our Sun. At the left side of the band, we can identify the bright star Deneb in the constellation Cygnus, The Swan, through which the Milky Way runs, meaning that a variety of star clusters are found in this constellation.
المصدر: Likai Lin/IAU OAE

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


The bright Moon is reflected in a pool of water. The diffuse light and dark patches of the Milky Way dominate the top right

Lyrid of the Lake

الشرح: Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.   Taken in the early hours of 24 April 2022, this image captures the sky of Yunnan Province, China, with a reflection on Lake Nian. The Milky Way is visible on the left side, while whitish Earth clouds are visible on the right. A Lyrid meteor crosses the sky along the Milky Way, its tail pointing back toward the shower's radiant in the constellation Lyra, which lies outside the image above the upper edge. The natural colours of the meteor are impressively clear. A few constellations are also visible. In the top left corner we can recognise the small constellation of the Dolphin, in which five brightest stars comprise the asterism. This asterism forms the head-part of the larger Greek constellation of the Dolphin and was considered the Dolphin since Roman times, when Ptolemy formed the new constellation of Equuleus in the southern part of the original figure. In mediaeval China, this asterism was considered the Good and the Rotten Gourd, the good one being formed by the brighter rhombus on the top and the rotten one made of faint stars in the tail of the Roman dolphin. The bright star to the right of the Dolphin and at the top of the image is Altair, the brightest star in the constellation Aquila. In Chinese uranology, Altair, together with some adjacent areas, forms the constellation of the Drum at the River. However, in Chinese folklore, the bright star stands for a boy in love with a girl, who is represented by the bright star Vega (in Lyra) on the other side of a huge celestial stream, the Milky Way. Vega is not visible in this image but the Lyrid meteor is like a teardrop of the unlucky girl who cannot reach her lover. In the upper right of the image, the constellation Scorpius shines with its bright reddish star Antares. With some of its neighbouring stars, it was regarded in China as the asterism of The Heart, which was also one of the Lunar Mansions. It was considered the heart of the Azure Dragon, the super-constellation of spring, in ancient China. Scorpius and Sagittarius, in the middle of the image, contain the brightest clouds of the Milky Way, the Galactic Centre, which also has clearly visible dark clouds in front of the bright ones. There is no classical Greco-Roman constellation between Aquila and Scorpius, but in the 17th century, two Polish astronomers, the couple Jan and Elizabeta Hevelius, named this area of bright clouds in the Milky Way Scutum, the Shield, in memory of a Polish king. In China, however, this area directly outside the super-constellation (or heavenly enclosure) of the Celestial Market Place was seen as depicting Market Officers.
المصدر: Jianfeng Dai/IAU OAE

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات

الرسوم التوضيحية المرتبطة


Scorpius appears as a letter T joined to a letter J. The ecliptic runs ESE to WNW and clips one arm of the T

Scorpius Constellation Map

الشرح: The constellation Scorpius (often commonly called Scorpio) along with its bright stars and surrounding constellations. Scorpius is surrounded by (going clockwise from the top) Ophiuchus, Serpens Caput, Libra, Lupus, Norma, Ara, Corona Australis and Sagittarius. Scorpius’s brightest star Antares appears in the heart of the constellation with the famous tail of Scoprius in the south-east (lower left). Scorpius lies on the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. The Sun only spends a short amount of time in late November in Scorpius. The other planets of the Solar System can often be found in Scorpius. Scorpius lies south of the celestial equator. The whole constellation is not visible from the most arctic regions of the world with parts of Scorpius obscured for observers in northern parts of Asia, Europe and North America. Scorpius is most visible in the evenings in the northern hemisphere summer and southern hemisphere winter. The yellow circles mark the positions of the open clusters M6, M7 & NGC 6231 while the yellow circles with plus signs superimposed on them mark the globular clusters M4 and M80. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The circle around Antares indicates that it is a variable star. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. The blue line marks the ecliptic, the path the Sun appears to travel across the sky over the course of one year. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
المصدر: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


Sagittarius is shaped like a teapot pouring tea south west. The ecliptic runs WSW to ENE at the top of the constellation

Sagittarius Constellation Map

الشرح: The constellation Sagittarius along with its bright stars and surrounding constellations. Sagittarius is surrounded by (going clockwise from the top) Aquila, Scutum, Serpens Cauda, Ophiuchus, Scorpius, Corona Australis, Telescopium, Microscopium and Capricornus. The brighter stars in Sagittarius form a distinctive teapot shape. Sagittarius lies on the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. The Sun is in Sagittarius from mid December to mid January. The other planets of the Solar System can often be found in Sagittarius. Sagittarius lies south of the celestial equator. The famous teapot asterism is visible for all but the most arctic regions of the world but the most southerly parts of the constellation are not visible in northern parts of Asia, Europe and North America. Sagittarius is most visible in the evenings in the northern hemisphere summer and southern hemisphere winter. The supermassive black hole Sagittarius A* which lies at the center of our Milky Way Galaxy is sits on the western (here right-hand) edge of Sagittarius. Due to it covering an area at the center of our Galaxy, Sagittarius is home to many star clusters including open clusters (marked here with yellow circles) and globular clusters (marked here with yellow circles with + signs superimposed on them). Three nebulae are also marked here with green squares. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
المصدر: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


Capricornus appears as a downward pointing isosceles triangle. The ecliptic runs through the center from WSW to ENE

Capricornus Constellation Map

الشرح: The constellation Capricornus (commonly called Capricorn) including its bright stars and surrounding constellations. Capricornus is surrounded by (going clockwise from the top) Aquarius, Aquila, Sagittarius, Microscopium and Piscis Austrinus. Capricornus lies on the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. The Sun is in Capricornus from mid January to mid February. The other planets of the Solar System can often be found in Capricornus. Capricornus lies just south of the celestial equator and is visible to all observers south of the Arctic Circle. Capricornus is most visible in the evenings in the northern hemisphere autumn and southern hemisphere spring. In the south east (lower left on this diagram) of the constellation one can find the globular cluster M30 (shown here as a yellow circle with a plus sign superimposed on it). The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
المصدر: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


Ophiuchus appears as a headless stick figure

Ophiuchus Constellation Map

الشرح: The constellation Ophiuchus along with its bright stars and its surrounding constellations. Ophiuchus is surrounded by (going clockwise from the top): Hercules, Serpens Caput, Scorpius, Sagittarius and Serpens Cauda. Ophiuchus is not part of the traditional twelve zodiac constellations but it lies on the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. The Sun is in Ophiuchus from late November to mid December. The other planets of the Solar System can often be found in Ophiuchus. Ophiuchus spans the celestial equator and thus part of the constellation is visible across the whole of the earth at some point in the year. However during the time it is most visible in the evenings (the southern hemisphere winter and northern hemisphere summer) much of the arctic is in perpetual daylight making the stars in the constellation impossible to see. The whole constellation is visible from equatorial and temperate regions of both hemispheres. As Ophiuchus lies close to the galactic center it contains many globular clusters such as M9, M10, M12, M14, M19, M62, and M107. These are marked as yellow circles with plus symbols superimposed. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
المصدر: Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات


Corona Australis has a sickle shape, curving upwards as we move from right to left

Corona Australis Constellation Map

الشرح: The constellation Corona Australis with its brighter stars and surrounding constellations. Corona Australis is surrounded by (going clockwise from the top): Sagittarius, Scorpius, Ara and Telescopium. This constellation has relatively few bright stars. Corona Australis is a southern constellation and thus the whole constellation is visible in the southern hemisphere at some point in the year. The constellation can also be viewed from equatorial and some temperate regions of the northern hemisphere. The constellation is best viewed in the evening in the northern hemisphere summer and southern hemisphere winter. The globular cluster NGC 6541 lies in Corona Australis and is marked here with a yellow circle with a plus sign superimposed on it. The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the lines joining the stars appear on the sky. The blue line at the top right of the diagram marks the ecliptic.
المصدر: Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope

License: CC-BY-4.0 المشاع الإبداعي نَسب المُصنَّف 4.0 دولي (CC BY 4.0) أيقونات