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 the moon......

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Sandeep Sunstar

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PostSubject: the moon......   Wed May 29, 2013 4:07 pm

THE MOON: EARTH’S ONLY SATELLITE
April 15, 2010

Salient features of the moon, the earth’s only satellite, are as follows:

. The moon is earth’s only satellite.

. The mean distance between the earth and the moon is about 3,85,000 km.

. Moon has a diameter of about 3,480 ‘km and a mass 1 of about 81 that of the earth.

. The orbit of the moon is elliptical.

. The time taken by the moon to complete one revolution around the earth is 27 days, 7 hours, 43 minutes and 11 1/2 seconds, or about 273 days. (This period is called sidereal month.)

.The period of moon’s revolution of the sun is 29.53 days on an average, and is called synodic month.

. The moon’s period of rotation around its axis and revolution round the earth is same.

. Moon at all times keeps the same side towards the earth.

. The plane of the moon’s orbit is inclined at an angle of 5° 09′ to the plane of the ecliptic.

. When the sun and the moon lie on the same side of the earth, the moon is said to be in conjunction with the sun.

. When the sun anc:l. the moon are on opposite sides of the earth, they are sail.:! to be in opposition.

. The major cause of sea-tides is the gravitational pull of the moon. The sun, because of its greater distance from he earth, has a tide-producing power that is only five-elevenths the tide-producing power of the moon.

. When the moon is between the earth and the sun, the position is called the New Moon. On New Moon, the part of the moon facing the earth is in complete darkness. The moon takes different shapes on different days after the New Moon: waxing crescent (after 3 days), first quarter (7th day), waxing gibbuns (10th day), full moon (14th day), and waning gib bous (17th day), last quarter (21st day), and waning crescent (25th day).
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Sandeep Sunstar

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PostSubject: Re: the moon......   Wed May 29, 2013 4:08 pm

MOON AND TIDES
April 8, 2010

MOON AND TIDES Tides are defined as slight oscil lations of sea level that occur approximately twice a day and attain exaggerated proportions in marginal seas, straits and estuaries. The major cause of the tides is the gravi tational pull of the moon and the sun. Though both the sun and the moon exert gravitational force on earth to produce tides, the moon, by nature of its closeness to the earth has a greater control over the timings of the” tidal rises and falls.

Lunar Tides As the moon travels in its orbit in the same direction as the earth’s rotation, a period of 24 hours, 50 minutes elapses between two successive occasions when the moon is vertically above a point. The highest level the water reaches is called a high tide and the lowest level is called a low tide. High and low tides occur twice each during the period of 24 hours, 50 minutes, giving an interval of about 121h hours between successive high (or low) tides.

Under the influence of the moon, water at H2 is pulled towards the moon more than towards the earth and therefore water piles up at H2 forming a high tide. The earth is pulled towards the moon more than the water at Hl; therefore water lags behind and piles up at Hl forming a high tide. The moon’s pull causes water to be drawn from Ll and L2; therefore there are low tides there.
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