Astronomy

New PDF release: Astronomy - Fundamentals and Frontiers

By Robert Jastrow

ISBN-10: 0471018457

ISBN-13: 9780471018452

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Additional resources for Astronomy - Fundamentals and Frontiers

Example text

In sidereal time a star appears on the horizon, rises to its highest point in the sky, and sets at the same time throughout the year. Astronomical observatories find it useful to have clocks that keep sidereal time, but an astronomer will soon get into trouble if he decides when to go home on the basis of a sidereal clock, 6 because he will be home four minutes earlier every day, and after six months he will expect his dinner at breakrotated four minutes or fast time. Clocks that keep solar time are preferable for the regulation of practical affairs.

Sometimes the longitude is expressed other ways. in It may be written as the angle from the prime meridian to the local meridian, running counterclockwise (eastward) north pole. in the In this when the earth system, longitudes may example above, with a longitude is viewed from above the range to 360°, and the point of 30°W in the conventional system, would have a longitude of 330°. Longitude (westward) may when also be specified as the angle running clockwise in is viewed from above the north pole, the earth which case in the above example the longitude would be simply 30°.

Three stars differ radically from their apparent brightnesses, because they lie at widely different distances from est of the three stars, 1600 times Deneb is intrinsically the bright- brighter than Vega and 6400 times us. appears to be the dimmest star in the triangle farthest away— 1400 light-years from the solar system versus brighter than Altair, but it because it is 26 light-years for Vega and 16 light-years for Altair. 30 The summer by Deneb, Vega, and triangle formed Altair. from Altair us, the fact that means that its Deneb brightness is is 1400/16 cut = 88 times down by farther a factor of away than 88 2 or approx- imately 7700.

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Astronomy - Fundamentals and Frontiers by Robert Jastrow


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