Astronomy Ch 2

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Title:	Astronomy Ch 2
Description:	angular diameter The angle formed by lines extending from the observer to opposite sides of an object. (p. 21) <br />angular distance The angle formed by lines extending from the observer to two locations. (p. 21) <br />apparent visual magnitude (mv) The brightness of a star as seen by human eyes on Earth. (p. 16) <br />asterism A named grouping of stars that is not one of the recognized constellations. Examples are the Big Dipper and the Pleiades. (p. 15) <br />celestial equator The imaginary line around the sky directly above Earth's equator. (p. 20) <br />celestial pole (north or south) One of the two points on the celestial sphere directly above Earth's poles. (p. 20) <br />celestial sphere An imaginary sphere of very large radius surrounding Earth and to which the planets, stars, sun, and moon seem to be attached. (p. 20) <br />circumpolar constellation (north or south) A constellation so close to one of the celestial poles that it never sets or never rises as seen from a particular latitude. (p. 21) <br />constellation One of the stellar patterns identified by name, usually of mythological gods, people, animals, or objects. Also, the region of the sky containing that star pattern. (p. 14) <br />east point One of the four cardinal directions. The point on the horizon directly east. (p. 20) <br />horizon The circular boundary between the sky and Earth. (p. 20) <br />magnitude scale The astronomical brightness scale. The larger the number, the fainter the star. (p. 15) <br />minute of arc An angular measure. One sixtieth of a degree. (p. 21) <br />model See scientific model. <br />nadir The point on the celestial sphere directly below the observer. The opposite of the zenith. (p. 20) <br />north celestial pole The point on the celestial sphere directly above Earth's North Pole. (p. 20) <br />north point One of the four cardinal directions. The point on the horizon directly north. (p. 20) <br />precession The slow change in the direction of Earth's axis of rotation. One cycle takes nearly 26,000 years. (p. 18) <br />scientific model A tentative description of a phenomenon for use as an aid to understanding. (p. 18) <br />second of arc An angular measure. One sixtieth of a minute of arc. (p. 21) <br />south celestial pole The point on the celestial sphere directly above Earth's South Pole. (p. 20) <br />south point One of the four cardinal directions. The point on the horizon directly south. (p. 20) <br />west point One of the four cardinal directions. The point on the horizon directly west. (p. 20) <br />zenith The point on the sky directly above the observer. (p. 20)
Number of Cards:	24
Author:	thesuhys13
Created:	2006-04-30
Tags:	astronomy
Private:	No
Favorite Count:	1
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