I. Motions of the SkyII. StarsIII. ProcessionIV. Astrology vs. AstronomyASTRON 89 1st Edition Lecture 4Outline of Last Lecture I. Motions of the SkyII. Stars III. ProcessionIV. Astrology vs. Astronomy Outline of Current Lecture I. The Celestial Sphere II. Measuring Angles in the SkyIII. Reason for Seasons IV. Equinoxes and Solstices Current LectureI. The Celestial Sphere (be able to label. Picture in lecture notes)a. North celestial pole b. South celestial pole c. Horizond. Circumpolar stars e. Stars the rise and setf. Stars that never set i. You always see these stars (i.e. Big Dipper)II. Measuring Angles in the Skya. Angles are used to help locate planets, stars, etc. b. You can use your hand and fingers to measure angles in the sky III. Reason for Seasons a. Caused by Earth’s tilti. Angle of tilt is 23.5˚ii. The Earth is tilted with respect to where the Sun is 1. The axis points towards the Sun b. It is incorrect to say that seasons are caused by Earth’s proximity to the Sun IV. Equinoxes and Solstices a. Know following terms: i. Vernal equinox: spring begins here, when daylight length is the same everywhere in the world (about 12 hours)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.ii. Autumnal equinox: autumn begins here, daylight length is the same everywhere in the worldiii. Winter solstice: sun is at its southern most point in the sky iv. Summer solstice: sun is at its northern most point in the sky b. When the ecliptic and celestial equator intersect, day and night are each 12 hours long: equinoxc. When the sun reaches its northern most point:
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