Iniciación COURSE A LA ASTRONOMY (25)
A TOTAL ECLIPSE OF SUN
continue with the process followed by an eclipse.
suddenly appears the solar corona, appear in the sky the planets and brightest stars. The total is short and the third contact occurs in a similar manner but in reverse order.
Another type of solar eclipse is a hybrid, mixed or worn. Occurs when the tip of the umbra falls short on the surface of the Earth and the event is void, but is changing its project total to finish abort.
Mercury and Venus are the planets closest to the Sun than the Earth, are called inner planets. Proóximo
The planet Mercury and the Sun is moving in the sky faster than any other planet and its rotation period is 58.65 days, ie 2 / 3 of its period of movement around the sun is Venus
the star, following the sun and moon, the brighter the sky, reaching favorable conditions (39 days before or after inferior conjunction) the magnitude -4.4. Because that appears before sunrise or after sunset, is known as "morning star" or "star of the evening."
The maximum angular separation of Mercury is 28 ° and Venus is 47 degrees, therefore never be seen at the zenith of the sky at midnight.
Mercury always appears near the sun, you can watch 2 hours and 15 minutes, at most, before sunrise and after sunset solar. Making it difficult telescopic observation of this planet, since sunlight and prevents or hinders. Venus
also observed before sunrise or after puesta.Al be further from the Sun, is visible up to 4 hours before sunrise and after sunset solar.
Both planets show phases like the Moon. The inner planets have a different geometry of planetary positions to the outer planets. To explain these relative movements consider the sun in the center of two concentric circles, representing the lower radio inside the orbit of the planet and the largest radio to Earth orbit.
is said that a planet is at inferior conjunction when the planet is at its farthest from Earth. In the vicinity of a superior conjunction, an inner planet shows its face fully illuminated, but it is hard to see considering his apparent closeness to the Sun
Approaching greatest elongation east, being visible at dusk, the planet reveals a growing phase effect as the moon.
After a while, the planet is at inferior conjunction, it is said that the planet is at inferior conjunction when the planet is in place closest to the Earth. At inferior conjunction the planet can not be observed both for its proximity to the Sun and the small lighted portion, as directed toward Earth, its dark side. Subsequently, the planet reaches its greatest elongation west, being the planet visible in the vicinity of the dawn, until finally found a new superior conjunction.
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