The Earth

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by valeminila
Last updated 8 years ago


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The Earth

The Earth, a STAR

what is GALAXY?


1) What is GALAXY?2) The Milky Way galaxy3) Rotation and Revolution 4) The Earth and it SEASONS


For thousands of years men have looked to the sky and wondered what are those bodies that shine and move against blue velvet in the background. Our planet is the third from the sun and it has the shape of a tilted ellipse because when it turns in the space is not completely straight but has a tilt on its axis.

Today we know that the universe is composed of vast amounts of stars that are grouped into sets that are called galaxies, however, not all stars that make up a galaxy are equal. In fact, it is precisely the variability of these stars (color, temperature, density, evolution, distribution and volume) which gives its characteristics to the galaxies.

His axis called rotation or polar, is the imaginary line that the Earth rotates, moving around the sun, but always keeping the same tilt on its axis. Therefore Earth movements present two fundamental rotational and translational movements.

Movements of the EARTH

translational motion, the Earth travels in an elliptical orbit around the sun. The round trip takes 365 days, 5 hours and 48 minutes and starts on March 21, it is called a tropical year and solar year. Also for the convenience of all, there is a calendar year consisting of 365 days and starts on January.

Rotational movement, the Earth moves on its polar Axis following a direction from west to east, causing the sun to appear in the east and hide on the West. The exact duration of this rotation is called sidereal day and consists of exactly 23 hours, 56 min, and 05 seconds, but for the convenience of everyone, the adjustment is made, called civil calendar and lasts 24 hours.


The galaxy that hosts our planet is called Milky Ways and has a spiral shape, besides is formed by young blue and white stars. It may contain at least as many planets as well. The Solar System is located within the disk, about 27,000 light-years away from the Galactic Center, on the inner edge of a spiral-shaped concentration of gas and dust called the Orion–Cygnus Arm.


The seasons: due to translational motion, the Earth moves away or is approaching the sun, and therefore the light is not distributed evenly on the Earth’s surface, which gives rise to the changes of the seasons.



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