quarta-feira, 1 de setembro de 2010

Por que a lua aparece de dia? - tradutor de inglês


Muitas vezes vemos a lua durante o dia, muito branca no céu, o planeta Venus também pode ser visto durante o dia. Mas seu brilho é bem inferior ao da lua, por isso devemos saber para onde olhar para podermos observá-lo. A lua estando mais perto da terra é mais fácil de ser observada. Nesta época do ano (setembro) Venus esta um pouco deslocado do sol mais ou menos 15 graus adiantado, olhando para este local poder ser visto durante o dia, das 10 da manhã as 10 da noite, vale a pena tentar. Aprenda mais sobre a lua e seu brilho com este texto em inglês, alem de ser informativo serve p/ vc ir praticando seu aprendizado deste idioma tão importante. Good luck!



Why does the Moon sometimes come out during the day?


You can see the Moon in the daytime because it is big and brightly lit by the Sun. The surface of the Moon is about as reflective as an asphalt road--rather dark but not totally black. When you look at the Moon, you are seeing the light which reflects off it. This is not nearly as bright as the Sun, but it is up to 100,000 times as bright as the brightest nighttime star.
During the day, the brightness of the sky washes out the light from the stars: a region of the sky including a bright star is only very slightly brighter than a region of the sky without a bright star, so your eye cannot notice the difference. However, the region of the sky containing the Moon is much brighter, so you can see it. You can also sometimes see Venus during the day if the conditions are right and you know exactly where to look, but anything dimmer is lost.
It might be useful to think of the Sun as a large light bulb, and the moon as a large mirror. There are situations where we can't see the light bulb, but we can see the light from the bulb reflected in the mirror. This is the situation when the moon is out at night. We can't see the Sun directly because the earth is blocking our view of it, but we can see its light reflected from the moon. However, there are also situations where we can see both the light bulb and the mirror, and this is what is happening when we see the moon during the day. You can explore this for yourself with a light and a hand mirror. Depending on which way you face (away from the light or sideways to the light) you can see either just the mirror, or both the light and the mirror.

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