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Seven images of the Sun. From the left it sinks, reaching its lowest in the centre image, before rising higher to the right.

When the Sun Bounces

image
Créé pour l'OAE

Légende : First place winner in the 2023 IAU OAE Astrophotography Contest, category of Still images of sunrise and sunset location over the year. This image was taken at Norway's North Cape. Owing to the latitude of this location, the Sun never truly sets during the summer months, from around April to August. This results in the unique spectacle of continuous daylight, known as a polar day. This captivating series of images, taken in 2022, showcases the Sun's relentless journey across the horizon every 30 minutes. At its lowest point in the sky, the Sun does not set, but appears to bounce off the horizon. The globe on the far right in the photo stands as a sentinel, marking the northernmost point of the European continental mainland.
Crédit : Milos Obert/IAU OAE (CC BY 4.0)

Termes du glossaire: Trajectoire du soleil (Arc diurne) , Cercle polaire , Cercle arctique , Journée polaire
Catégories : Astronomie à l'œil nu
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 3.54 MB)

Curved bright lines rise from the left, peaking on the right. The further to the left a line rises, the higher it peaks.

The Path of the Sun

image
Créé pour l'OAE

Légende : Second place winner in the 2023 IAU OAE Astrophotography Contest, category of Still images of day arcs of the Sun and Solargraphs. This enchanting image, captured in Germany between 21 June 2018 and 21 December 2018, is a poetic blend of art and science, showcasing nature's rhythm and the passage of time. It combines images taken at different times of day over the course of six months. Each curve tracks the Sun’s path (or arc) across the sky on a particular day. The sweeping arc of the Sun is distorted here by the projection, making it appear like a curve. The position of the daily arc across the sky changes with the Sun’s seasonal movement in the sky. Captured using a simple pinhole camera fashioned from a coffee can, it shows the Sun's journey over the course of six months, and the gradual shift of the daily arc from the summer, when it is higher in the sky, to its lowest arc at the winter solstice. Gaps in the Sun’s path represent days or times of day when the Sun was obscured by clouds. This image is a vivid testament to the changing seasons, revealing the Sun's dance in the sky as days grow shorter or longer.
Crédit : Frank Niessen/IAU OAE (CC BY 4.0)

Termes du glossaire: Equinoxe , Solstice , Solstice d'été , Trajectoire du soleil (Arc diurne) , Solstice d'hiver
Catégories : Astronomie à l'œil nu
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 465.46 kB)

Three paths of the Sun across the sky. The highest almost crosses the middle of the image, the lowest is one sixth of the way

Solstices and Equinox

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Créé pour l'OAE

Légende : Honorable mention in the 2023 IAU OAE Astrophotography Contest, category of Still images of day arcs of the Sun and Solargraphs. This captivating image showcases the journey of the Sun through the sky during the winter solstice (bottom), equinox (middle), and summer solstice (top) in Bursa, Turkey, between 21 December 2007 and 20 June 2008. Using a fisheye lens, the photographer captured the Sun's positions at regular intervals from sunrise to sunset on the three different days, illustrating the changing lengths of day and night throughout the year. The variations in the Sun’s daily path across the sky, its height at midday, and the positions of sunrise and sunset, as well as the length of a day, depend on Earth’s axial tilt relative to its orbit around the Sun. The series was taken from a rooftop in Bursa, where the local terrain adds its own unique touch by occasionally obstructing the horizon. Oriented with north at the top and south at the bottom, this visual diary serves as a stunning representation of the Sun’s path for those residing in mid-northern latitudes.
Crédit : Tunç Tezel/IAU OAE (CC BY 4.0)

Many images of the sunset in a montage. The Sun’s setting position changes from the left in winter to the right in summer.

Occasive Amplitude

image
Créé pour l'OAE

Légende : Second place winner in the 2023 IAU OAE Astrophotography Contest, category of Still images of sunrise and sunset location over the year. Captured from Gatto Corvino village in Sicily, this composite showcases the Sun setting at various points over the sea from the winter to the summer solstice (2016–2017). The centre frame marks due west. As Earth orbits the Sun, the position of the setting (and rising) Sun changes from being northward of due west (east) in summer to southward of due west (east) in winter. During the equinoxes — when day and night are of equal length — the Sun rises directly in the east and sets directly in the west. The changing location of the Sun on the horizon is due to Earth’s axial tilt as it orbits the Sun. In temperate regions of Earth, the Sun’s height above the horizon at noon is at its highest and lowest points in the sky on the summer and winter solstices respectively.
Crédit : Marcella Giulia Pace/IAU OAE (CC BY 4.0)

image d'illustration pour Seasons Around the World

Seasons Around the World

Activités pédagogiques de astroEDU (liens vers le site astroEDU)
Description : Demonstrate the seasons on Earth using a model.

Termes du glossaire: Terre , Équateur , Orbite , Saisons , Soleil , Rotation
Catégories : Astronomie observationnelle , Planète Terre
Mots clés : Hands-on , Model
Tranches d'âge : 6-8 , 8-10 , 10-12
Niveau scolaire : Collège , Primaire
Domaines d'apprentissage : Modélisation , Apprentissage par enquête
Coûts : Moyen
Durée : 45min
Taille du groupe : Par groupe
Compétences : Analyser et interpréter des données , Poser des questions , Construire des explications , Développer et utiliser des modèles , Planifier et mener des enquêtes
Auteurs : Space Awareness

Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

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Le Bureau de l'astronomie pour l'éducation est hébergé par la Maison de l'astronomie sur le campus de l'Institut Max Planck d'astronomie à Heidelberg. Le Bureau de l'astronomie pour l'éducation est un bureau de l'Union Astronomique Internationale, avec un financement important des Fondations Klaus Tschira et Carl Zeiss. Les colloques Shaw-IAU sur l'astronomie pour l'éducation sont financés par la Fondation Shaw Prize.