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Résultats de la recherche
Moon-Mercury-Pleiades Conjunction
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Créé pour l'OAE
Légende : Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.
This photograph shows the young lunar crescent, some of the nine brightest stars of the Pleiades (with one behind a cloud) on the right, and the planet Mercury, looking slightly red, in the middle of the image.
This picture is rather suggestive of the idea that the Pleiades might possibly consist of seven stars. However, the viewer is misled by the clouds; five of the stars form a tiny chariot, one is next to the handle, and three are at the other end of the quadrilateral. Eight stars would be clearly visible if there were no clouds.
This configuration of the young Moon next to the Pleiades is visible only in the northern hemisphere spring. Thus it was used by the ancient Babylonians to determine the second month of their year and to judge whether or not an intercalary month was necessary. At least as early as the second millennium before the common era, the Babylonians used several asterisms for each month, with another one of them reappearing every five days after invisibility during daylight. To determine the necessity of intercalation in order to synchronise the solar and the lunar year, the Babylonians used several asterisms, not only the Pleiades. For instance, they also made use of the bright stars Arcturus and Sirius, and they observed a configuration with the Moon as well as heliacal phenomena. The modern Jewish and modern Islamic traditions still make use of some of the Babylonian astronomical rules. However, given that the constellations have shifted as a result of precession, and the fact that nowadays we also have computational means to calculate our calendars, this configuration of the small crescent Moon and the Pleiades is less useful, though it remains exceptionally beautiful. Thus the ancient Babylonian and middle Babylonian tradition survives only rudimentarily. Furthermore, it is unlikely that it is depicted in the Nebra Disc from Bronze Age Europe, as has long been claimed.
This image was taken on Elba Island, Italy, in May 2022.
Crédit : Giulio Colombo/ IAU OAE
Termes du glossaire:
Conjonction , Mercure , Lune , Le premier croissant , Croissant de lune , Pléiades
Catégories :
Astronomie à l'œil nu
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( image 420.90 kB)
High-resolution image of the surface of the Sun
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Légende : This high-resolution image of a small portion of the outermost visible "surface" of the Sun (the photosphere) covers an area 36,500 by 36,500 km. It was one of the first images taken by the Daniel K. Inouye Solar Telescope, as part of the telescope's Science Verification Phase. Each of the cells that are visible is about the size of the US state Texas, or of France, or of Afghanistan, or of Somalia. In the brighter centers of these cells, plasma from the underlying regions rises to the surface, cools off, and then sinks down again at the location of the darker lanes delineating the cells. In these dark lanes we can also see the tiny, bright markers of magnetic fields.
Crédit : NSO/NSF/AURA
Lien du crédit
Termes du glossaire:
Photosphère , Granulation
Catégories :
Le Soleil
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Fichier
( image
17.04 MB)
Montage photo d'une éclipse partielle de Soleil prise avec un smartphone
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Créé pour l'OAE
Légende : Mention honorable au concours d'astrophotographie 2023 de l'AIU OAE, catégorie Images fixes avec smartphones-appareils mobiles : Smartphone Partial Eclipse Combined, par Douglas Duncan.
En 2021, le Maine, aux États-Unis, a été témoin d'une captivante éclipse solaire partielle, un spectacle astronomique au cours duquel la Lune passe entre la Terre et le Soleil, bloquant partiellement la lumière rayonnante du Soleil vue de la Terre. Cette image a été prise à l'aide d'un smartphone et d'une application et d'un filtre appelés "Solar Snap", inventés par le photographe, pour capturer les différentes étapes de ce phénomène céleste. Il est essentiel de noter que l'observation d'une éclipse solaire ne doit se faire qu'avec une protection oculaire adéquate afin d'éviter les lésions oculaires causées par l'exposition directe à la lumière du Soleil. Lors d'une éclipse solaire, la Lune atteint un point de son orbite où elle se trouve entre la Terre et le Soleil, ce qui entraîne une couverture partielle ou complète du disque solaire, en fonction des positions relatives spécifiques. Cette image composite combine parfaitement six moments distincts, présentant le voyage progressif de la Lune à travers le disque du Soleil, et reçoit une mention honorable dans la catégorie des images fixes prises exclusivement avec des smartphones/appareils mobiles. Chaque croissant présenté représente une phase unique de cet événement captivant, offrant un aperçu fugace des merveilles de notre monde naturel. Des outils accessibles comme les smartphones, associés à des applications et des filtres appropriés, permettent aux individus de documenter et de chérir en toute sécurité ces événements célestes remarquables.
Crédit : Douglas Duncan/UAI OAE (CC BY 4.0)
Termes du glossaire:
Eclipse solaire partielle
Catégories :
Astronomie à l'œil nu
, Système solaire
Mots clés :
astrophotography
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( image 465.84 kB)
The Speed of Spacecraft
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Légende : This infographic is part of the "Simplifying Astronomy for Arabic Speakers" project, aiming to present scientific concepts in a simple and accessible way. The design focuses on the speed of spacecraft during the various stages of their launch, illustrating how velocity changes as the spacecraft progresses to reach the desired orbit.
Details of the Stages:
Stage One (Launch):
The spacecraft begins its journey by launching from the launch pad with an increasing speed. The velocity in this stage is influenced by Earth's gravity and atmospheric resistance.
After One Minute:
The spacecraft reaches a speed of approximately 1,600 kilometers per hour (km/h), reflecting a rapid acceleration powered by its engines.
After Two and a Half Minutes:
The rocket boosters are jettisoned, allowing the spacecraft to reach a speed of about 4,800 km/h. At this point, the spacecraft becomes lighter, enabling it to accelerate more efficiently.
Final Stage:
By the end of the ascent phase, the spacecraft achieves its final speed of approximately 28,000 km/h, allowing it to enter the desired orbit around Earth.
Through educational designs like this, the project provides enthusiasts with an opportunity to understand the intricate details of space missions in an engaging and simplified manner.
Crédit : Ali Al-Edhari ; Background image credit - NASA
Termes du glossaire:
Fusée
Langue : Arabic
Script : Arabic
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Fichier
( image
11.88 MB)
Stone Star Circles, Startrails above Stonehenge, by Till Credner, Germany
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Créé pour l'OAE
Légende : Second place in the IAU OAE Astrophotography Contest, category Star trails.
Astronomy is one of the oldest (if not the oldest) of the sciences, and as such has connection to various cultures over millennia. This image in a way conveys this relationship by being contextualised in Stonehenge. There is much research into what astronomers call archeoastronomy sites, and how they connect to the sky (for example, seasons, phases of the moon and much more). Civilizations across time and from all over the world have their own views and interpretations of what they see in the sky, and this has been tied not only to culture but also to the people’s day-to-day and seasonal activities. The “concentric circles” which are often referred to as “star trails”, are the result of the apparent motion of the sky, which is in reality due to the rotation of the Earth on its axis. The small dot appearing towards the top center of the image is Polaris – The North or Pole Star. Polaris is only visible to observers in the Northern latitudes. The height of the Pole Star can be used to infer the observer’s actual latitude. Stonehenge is located at around 51° North. This image is taken from one of the most notable ancient sites in the world, brings us back in time, and makes us wonder about the stories told by the people that lived in that place many millennia ago.
Crédit : Till Credner/IAU OAE
Termes du glossaire:
Étoiles circumpolaires , La piste des étoiles
Catégories :
Astronomie à l'œil nu
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( image 1.26 MB)
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