Lec 6 Actual - AST101 F Lecture 6 30 September 2010 Prof...

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AST101 F Lecture 6 30 September 2010 Prof. Mochnacki
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L o c a tion : A s tro no m y & A s tro phys ic s D ept. 50 S t. G eo rg e S t., A s tro no m y L o ung e T im e: T hurs da ys 3-4pm O bjec tive: D is c us s . P a rtic ipa te. E x plo re. J o in us o n Fa c ebo o k : http://w w w .fa c ebo o k .c o m /g ro up.php? http://w w w .fa c ebo o k .c o m /g ro up.php? g id=106789254943& ref=ts g id=106789254943& ref=ts AS TR O-101 As tronomy C lub 8( π )
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Announcements 1. Hubble IMAX tickets available at the low-low discounted rate of $10 each. Show is Oct. 22 at 7 pm. See Dr. Reid with exact cash during his office hours or in the hour after the lecture to get tickets. He will stand outside the lecture hall at the end of the lecture and sell tickets (front right entrance). 2. Midterm will take place on Thurs. Oct. 7 during class time. Room assignments are done by tutorial section and will be posted on Blackboard. 3. Dr. Reid will be holding a midterm review session next week. Stay tuned to the announcements on Blackboard for more details.
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Topics for Today Annual changes The seasons Orbit of the moon and its phases. Eclipses of the Moon and Sun.
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Review: Coordinates on the Earth Latitude: position north or south of equator Longitude: position east or west of prime meridian (runs through Greenwich, England) Note: Lo 350 º = 10º deg W
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Celestial coordinates
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Just as Greenwich serves to define the Prime Meridian on the Earth's surface, so the Vernal Equinox serves to define the zero right ascension line.
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Right Ascension and Declination: Celestial Coordinates
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Why do we have seasons on Earth? A)Because the Earth is closer to the Sun in the summer and farther from it in winter B)Because the Earth’s axis has a fixed tilt as it orbits the Sun, a given hemisphere alternately receives more or less direct sunlight C)The Earth’s tilt varies between 0 and 23.5 o , giving us summer and winter in a given hemisphere D)Seasons are caused by the tidal influence of the Sun and the Moon Clicker Question
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VOTING RESULTS
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Why do we have seasons on Earth?
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