Astronomy 203. Rotation and Revolution

 Seguimos con las clases de Astronomía y en esta clase vamos a hablar de los movimientos de rotación y traslación de los planetas alrededor del sol. Después haremos un reloj solar para comprobar esa rotación alrededor del sol

Para ello necesitaremos:

- 1 plato de plastico

- 1 lapicero

-  plastilina

- rotuladores de colores para las marcas

Aquí os dejo una página donde viene explicado

http://krokotak.com/2015/06/diy-sundial/

Y un vídeo explicativo, también muy sencillo

https://www.youtube.com/watch?v=dF5n6oLdrt4

 

https://www.youtube.com/watch?v=cDed5eXmngE&t=3s

https://www.youtube.com/watch?v=CqkQv617bcw

Astronomy 203. Rotation and Revolution

Like other planets of the solar system, the Earth moves in two different ways: one is called rotation… and the other is called revolution.

Rotation is the movement of the Earth on its own axis. Rotate means to turn. So, the Earth turns around a slightly-inclined imaginary line that joins the two poles, called the axis. Do you know how long it takes to make a complete turn?.. It takes 24 hours to make one rotation… Think about it for a second:.. Yes, that’s right!.. One day, day and night together, lasts 24 hours too. So the movement of rotation causes day and night. Interesting, right?

Now let’s see the movement of revolution… As you can see in the pictures, the Earth goes around the Sun in an elliptical orbit. That might sounds a little strange… but if you look… you’ll see it is simply the journey that the Earth makes around the Sun… Do you know how long it takes the Earth to make a complete revolution around the sun? Well, it takes… 365 days… Exactly – one year!..

This revolution movement is what makes the spring, with its colorful flowers… the hot summer, full of fun… the autumn, when leaves fall from the trees to the ground… and the cold and frosty winter.

So let’s remember the 2 kinds of movement that the Earth makes.

There is rotation, which is the Earth turning around itself… causing day and night… which lasts exactly 24 hours, the same as a whole day.

And there is revolution, which is the earth travelling around the sun… which takes 365 days and causes the seasons.