The Sun. Movement and constellations

What do you know about our star, the Sun?

Online simulations of the Sun will help us to learn more about the star that is closest to the Earth and supplies the energy to the Earth that allows life to exist.

The Sun, our nearest star, is a gigantic sphere of hot plasma that radiates light and heat in all directions. It is the center of our solar system and provides life and energy to all the planets that orbit it, including Earth.

The Sun is approximately 4.6 billion years old and is estimated to have a lifetime of at least another 5 billion years. Its size is impressive, with a diameter of about 1.4 million kilometers, making it 109 times larger than Earth. Its mass is about 333,000 times that of our planet and it contains more than 99% of the total mass of the solar system.

The Sun is composed mainly of hydrogen (about 74% of its mass) and helium (about 24%), along with traces of heavier elements. At its core, temperatures reach 15 million degrees Celsius and pressures are enormous, allowing nuclear fusion reactions to occur in which hydrogen nuclei combine to form helium, releasing large amounts of energy in the process.

This energy is transported to the surface of the sun through a process known as convection and is then emitted into space in the form of light and electromagnetic radiation at all wavelengths, from gamma rays and X-rays to visible light and even radio waves.

Solar radiation is essential for life on Earth. It is responsible for photosynthesis in plants, which converts sunlight into chemical energy and provides oxygen to the atmosphere. It is also the main source of heat on our planet, affecting weather patterns and regulating the water cycle.

Studying the Sun is fundamental to understanding how it works and predicting its behavior. Scientists use space and ground-based observatories to study its solar activity, such as sunspots, solar flares and coronal mass ejections, which can affect communications, power grids and navigation systems on Earth.

Online simulations of the Sun will show you some interesting details about the closest star to Earth. Learn and have fun!

The Zodiac


The ecliptic is the path the Sun describes in the sky. The zodiac is the twelve constellations of the ecliptic.
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Constellations of the Zodiac


The zodiac is a belt of the sky with a width of about 8° around the ecliptic. It allows us to locate the Sun, the Moon and most of the planets in their apparent position. It is divided into 12 parts, each of which corresponds to a constellation: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces.
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Diurnal motion of the Sun


The diurnal motion of the Sun is the change of the Sun’s position in the sky due to the rotational motion of the Earth.
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