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LECTURE 1
goals and outline
lecture title
lecture goals
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Understand just how the tilt of the earth's axis leads to varying lengths of day, which causes seasons.
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Understand how an observer on the earth views the moon's daily progress in its orbit around us, with more or less of the illuminated surface of the moon visible to us, that is, with the phase of the moon changing.
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Understand not only what causes eclipses of the sun (solar) and moon (lunar), and how much of the earth sees them for how long, but also why we don't have these eclipses every month.
outline of lecture
1. Seasons
2. Phases of the Moon
3. Eclipses
two poems
from THE MASQUE OF THE TWELVE MONTHS
Shine out, fair Sun, with all your heat,
Show all your thousand-coloured light!
Black Winter freezes to his seat;
The grey wolf howls, he does so bite;
Crook't Age on three knees creeps the street;
The boneless fish close quaking lies
And eats for cold his aching feet;
The stars in icicles arise:
Shine out and make this winter night
Our beauty's Spring, our Prince of Light!
--anonymous, twelfth century
from THE MOON AND THE YEW TREE
The moon is no door. It is a face in its own right.
White as a knuckle and terribly upset.
It drags the sea after it like a dark crime; it is quiet
With the O-gape of complete despair. I live here.
Twice on Sunday, the bells startle the sky--
Eight great tongues affirming the Resurrection.
At the end, they soberly bong out their names.
--Sylvia Plath
I have a collection of moon and sun poems, in various moods and languages and eras, if you're interested.
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Please email any questions, comments, or suggestions to
Professor Bernice Durand, bdurand@theory3.physics.wisc.edu.
Revised September 1, 1997.
Content © 1997, Bernice Durand
Images and layout © 1997, Shane Hamilton
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