{"id":141,"date":"2022-02-07T22:19:07","date_gmt":"2022-02-07T22:19:07","guid":{"rendered":"https:\/\/pressbooks.ccconline.org\/astronomy\/?post_type=chapter&p=141"},"modified":"2022-02-11T15:50:03","modified_gmt":"2022-02-11T15:50:03","slug":"chapter-2-key-terms","status":"publish","type":"chapter","link":"https:\/\/pressbooks.ccconline.org\/astronomy\/chapter\/chapter-2-key-terms\/","title":{"raw":"Chapter 2 Key Terms","rendered":"Chapter 2 Key Terms"},"content":{"raw":"
\r\n \t
accelerate<\/dt>\r\n \t
to change velocity; to speed up, slow down, or change direction.<\/dd>\r\n<\/dl>\r\n
\r\n \t
apparent magnitude<\/dt>\r\n \t
a measure of how bright a star looks in the sky; the larger the number, the dimmer the star appears to us<\/dd>\r\n<\/dl>\r\n
\r\n \t
astrology<\/dt>\r\n \t
the pseudoscience that deals with the supposed influences on human destiny of the configurations and locations in the sky of the Sun, Moon, and planets<\/dd>\r\n<\/dl>\r\n
\r\n \t
celestial equator<\/dt>\r\n \t
a great circle on the celestial sphere 90\u00b0 from the celestial poles; where the celestial sphere intersects the plane of Earth\u2019s equator<\/dd>\r\n<\/dl>\r\n
\r\n \t
celestial poles<\/dt>\r\n \t
points about which the celestial sphere appears to rotate; intersections of the celestial sphere with Earth\u2019s polar axis<\/dd>\r\n<\/dl>\r\n
\r\n \t
celestial sphere<\/dt>\r\n \t
the apparent sphere of the sky; a sphere of large radius centered on the observer; directions of objects in the sky can be denoted by their position on the celestial sphere<\/dd>\r\n<\/dl>\r\n
\r\n \t
circumpolar zone<\/dt>\r\n \t
those portions of the celestial sphere near the celestial poles that are either always above or always below the horizon<\/dd>\r\n<\/dl>\r\n
\r\n \t
cosmology<\/dt>\r\n \t
the study of the organization and evolution of the universe<\/dd>\r\n<\/dl>\r\n
\r\n \t
ecliptic<\/dt>\r\n \t
the apparent annual path of the Sun on the celestial sphere<\/dd>\r\n<\/dl>\r\n
\r\n \t
epicycle<\/dt>\r\n \t
the circular orbit of a body in the Ptolemaic system, the center of which revolves about another circle (the deferent)<\/dd>\r\n<\/dl>\r\n
\r\n \t
geocentric<\/dt>\r\n \t
centered on Earth<\/dd>\r\n<\/dl>\r\n
\r\n \t
heliocentric<\/dt>\r\n \t
centered on the Sun<\/dd>\r\n<\/dl>\r\n
\r\n \t
horizon (astronomical)<\/dt>\r\n \t
a great circle on the celestial sphere 90\u00b0 from the zenith; more popularly, the circle around us where the dome of the sky meets Earth<\/dd>\r\n<\/dl>\r\n
\r\n \t
horoscope<\/dt>\r\n \t
a chart used by astrologers that shows the positions along the zodiac and in the sky of the Sun, Moon, and planets at some given instant and as seen from a particular place on Earth\u2014usually corresponding to the time and place of a person\u2019s birth<\/dd>\r\n<\/dl>\r\n
\r\n \t
parallax<\/dt>\r\n \t
the apparent displacement of a nearby star that results from the motion of Earth around the Sun<\/dd>\r\n<\/dl>\r\n
\r\n \t
planet<\/dt>\r\n \t
today, any of the larger objects revolving about the Sun or any similar objects that orbit other stars; in ancient times, any object that moved regularly among the fixed stars<\/dd>\r\n<\/dl>\r\n
\r\n \t
precession (of Earth)<\/dt>\r\n \t
the slow, conical motion of Earth\u2019s axis of rotation caused principally by the gravitational pull of the Moon and Sun on Earth\u2019s equatorial bulge<\/dd>\r\n<\/dl>\r\n
\r\n \t
retrograde motion<\/dt>\r\n \t
the apparent westward motion of a planet on the celestial sphere or with respect to the stars<\/dd>\r\n<\/dl>\r\n
\r\n \t
year<\/dt>\r\n \t
the period of revolution of Earth around the Sun<\/dd>\r\n<\/dl>\r\n
\r\n \t
zenith<\/dt>\r\n \t
the point on the celestial sphere opposite the direction of gravity; point directly above the observer<\/dd>\r\n<\/dl>\r\n
\r\n \t
zodiac<\/dt>\r\n \t
a belt around the sky about 18\u00b0 wide centered on the ecliptic<\/dd>\r\n<\/dl>\r\n
This book was adapted from the following: Fraknoi, A., Morrison, D., & Wolff, S. C. (2016). Key Terms. In Astronomy<\/i>. OpenStax. https:\/\/openstax.org\/books\/astronomy\/pages\/2-key-terms under a Creative Commons Attribution License 4.0<\/a><\/div>\r\n
Access the entire book for free at https:\/\/openstax.org\/books\/astronomy\/pages\/1-introduction<\/a><\/div>","rendered":"
\n
accelerate<\/dt>\n
to change velocity; to speed up, slow down, or change direction.<\/dd>\n<\/dl>\n
\n
apparent magnitude<\/dt>\n
a measure of how bright a star looks in the sky; the larger the number, the dimmer the star appears to us<\/dd>\n<\/dl>\n
\n
astrology<\/dt>\n
the pseudoscience that deals with the supposed influences on human destiny of the configurations and locations in the sky of the Sun, Moon, and planets<\/dd>\n<\/dl>\n
\n
celestial equator<\/dt>\n
a great circle on the celestial sphere 90\u00b0 from the celestial poles; where the celestial sphere intersects the plane of Earth\u2019s equator<\/dd>\n<\/dl>\n
\n
celestial poles<\/dt>\n
points about which the celestial sphere appears to rotate; intersections of the celestial sphere with Earth\u2019s polar axis<\/dd>\n<\/dl>\n
\n
celestial sphere<\/dt>\n
the apparent sphere of the sky; a sphere of large radius centered on the observer; directions of objects in the sky can be denoted by their position on the celestial sphere<\/dd>\n<\/dl>\n
\n
circumpolar zone<\/dt>\n
those portions of the celestial sphere near the celestial poles that are either always above or always below the horizon<\/dd>\n<\/dl>\n
\n
cosmology<\/dt>\n
the study of the organization and evolution of the universe<\/dd>\n<\/dl>\n
\n
ecliptic<\/dt>\n
the apparent annual path of the Sun on the celestial sphere<\/dd>\n<\/dl>\n
\n
epicycle<\/dt>\n
the circular orbit of a body in the Ptolemaic system, the center of which revolves about another circle (the deferent)<\/dd>\n<\/dl>\n
\n
geocentric<\/dt>\n
centered on Earth<\/dd>\n<\/dl>\n
\n
heliocentric<\/dt>\n
centered on the Sun<\/dd>\n<\/dl>\n
\n
horizon (astronomical)<\/dt>\n
a great circle on the celestial sphere 90\u00b0 from the zenith; more popularly, the circle around us where the dome of the sky meets Earth<\/dd>\n<\/dl>\n
\n
horoscope<\/dt>\n
a chart used by astrologers that shows the positions along the zodiac and in the sky of the Sun, Moon, and planets at some given instant and as seen from a particular place on Earth\u2014usually corresponding to the time and place of a person\u2019s birth<\/dd>\n<\/dl>\n
\n
parallax<\/dt>\n
the apparent displacement of a nearby star that results from the motion of Earth around the Sun<\/dd>\n<\/dl>\n
\n
planet<\/dt>\n
today, any of the larger objects revolving about the Sun or any similar objects that orbit other stars; in ancient times, any object that moved regularly among the fixed stars<\/dd>\n<\/dl>\n
\n
precession (of Earth)<\/dt>\n
the slow, conical motion of Earth\u2019s axis of rotation caused principally by the gravitational pull of the Moon and Sun on Earth\u2019s equatorial bulge<\/dd>\n<\/dl>\n
\n
retrograde motion<\/dt>\n
the apparent westward motion of a planet on the celestial sphere or with respect to the stars<\/dd>\n<\/dl>\n
\n
year<\/dt>\n
the period of revolution of Earth around the Sun<\/dd>\n<\/dl>\n
\n
zenith<\/dt>\n
the point on the celestial sphere opposite the direction of gravity; point directly above the observer<\/dd>\n<\/dl>\n
\n
zodiac<\/dt>\n
a belt around the sky about 18\u00b0 wide centered on the ecliptic<\/dd>\n<\/dl>\n
This book was adapted from the following: Fraknoi, A., Morrison, D., & Wolff, S. C. (2016). Key Terms. In Astronomy<\/i>. OpenStax. https:\/\/openstax.org\/books\/astronomy\/pages\/2-key-terms under a Creative Commons Attribution License 4.0<\/a><\/div>\n
Access the entire book for free at https:\/\/openstax.org\/books\/astronomy\/pages\/1-introduction<\/a><\/div>\n","protected":false},"author":33,"menu_order":11,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[48],"contributor":[],"license":[],"class_list":["post-141","chapter","type-chapter","status-publish","hentry","chapter-type-numberless"],"part":98,"_links":{"self":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapters\/141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/wp\/v2\/users\/33"}],"version-history":[{"count":2,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapters\/141\/revisions"}],"predecessor-version":[{"id":206,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapters\/141\/revisions\/206"}],"part":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/parts\/98"}],"metadata":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapters\/141\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/wp\/v2\/media?parent=141"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/pressbooks\/v2\/chapter-type?post=141"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/wp\/v2\/contributor?post=141"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.ccconline.org\/astronomy\/wp-json\/wp\/v2\/license?post=141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}