AST 1002 MWF Notes 2 (1).docx - Chapter 2 2.1 Understanding the Seasons o Our goals for learning What causes seasons Why do constellations we see depend

AST 1002 MWF Notes 2 (1).docx - Chapter 2 2.1 Understanding...

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Chapter 2 2.1 Understanding the Seasons o Our goals for learning: What causes seasons? Why do constellations we see depend on the time of year? o Asterism: collection of the stars o 88 Constellations o o Zodiac Signs o Zenith is the highest point (altitude = 90 degrees) o Horizon has zero degree altitude o Earth is closer to the sun in summer and farther from the sun in the winter is FALSE . o Seasons happen because of the Earth’s tilt. o Earth keeps its rotation axis pointed the same direction in space at all times. o We define four special points:
Spring (vernal) equinox (Mar 21 st ) Summer solstice (June 21 st ) Fall (autumnal) equinox (Sep 22 nd ) Winter solstice (Dec 21 st ) o From the point of the summer solstice, days get shorter. o From the point of the winter solstice, days are longer, but nights are shorter(?). o Angle of the Sun’s rays: different times of year Amount of sunlight (energy) received per square meter depends on the angle of the Sun’s rays o Zodiac – the constellations that our Sun covers up (blocks) in the course of one year Aquarius

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