ASTR-1010 Planetary Astronomy Day - 10. HOMEWORK Homework Chapter 2: Due Today Motions of the Sun Motions of the Sun – Due Today Exam -1 – Next time–

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Presentation transcript:

ASTR-1010 Planetary Astronomy Day - 10

HOMEWORK Homework Chapter 2: Due Today Motions of the Sun Motions of the Sun – Due Today Exam -1 – Next time– chapters 1 & 2 only. - Look at Smartworks, Lecture-Tutorials, ClassAction questions, and remember the labs.

Eclipses!

There are two types of eclipses: Solar and Lunar

Why don’t we have an eclipse every month? The moon doesn’t orbit on the Earth’s equator or on the ecliptic

Eclipses only occur when the Earth, Sun and Moon all line up

Lunar Eclipse: the Earth passes directly between the Sun and Moon

The Total Lunar Eclipse Next one is December 21, 2010 in the early morning

A Solar Eclipse requires much more precise alignment

The Moon’s shadow is not large enough to cover the Earth

Solar Eclipses take hours to develop but last only minutes

During a total eclipse the Sun’s corona is visible

Partial eclipses are more common than total eclipses

Annular Eclipses occur when the Moon is at or near apogee

Predicting Eclipses The Saros Cycle…18 years 11.3 days

Lecture – Tutorial Path of the Sun: pg 87 Work with a partner! Read the instructions and questions carefully. Discuss the concepts and your answers with one another. Come to a consensus answer you both agree on. If you get stuck or are not sure of your answer, ask another group. If you get really stuck or don’t understand what the Lecture Tutorial is asking, ask one of us for help.

Lecture – Tutorial Seasons: pg 91 Homework! You won’t have to turn it in on Wednesday but there will be questions on the exam out of it