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## PowerPoint Slideshow about ' Seasonal Motion' - zytka

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The Zodiac throughout the Year

Example: In Winter sun in Sagittarius, Gemini at night sky;in summer sun in Gemini, Sagittarius at night sky

How do we “see” that the earth is moving around the sun or v.v.?

- Small discrepancy between sun’s motion and motion of stars
- Sidereal vs solar day
- At noon, say, the sun is not exactly in front of the same stars on the next day.
- It is exactly in the south
- The stars are faster, so a little west of south

Position of Ecliptic on the Celestial Sphere or v.v.?

- Earth axis is tilted w.r.t. ecliptic by 23 ½ degrees
- Equivalent: ecliptic is tilted by 23 ½ degrees w.r.t. equator!
- Sun appears to be sometime above (e.g. summer solstice), sometimes below, and sometimes on the celestial equator

Note: Three Coordinate Systems! or v.v.?

Two rotations about differently oriented axes, plus an observer that is oriented in a third direction!

Homework: Use Proportions or v.v.?

- Angle traveled compared to full 360 degrees = time elapsed while traveling the angle compared to total time to complete a 360 degree, full rotation
- angle/360 = time elapsed / x
- x is the period we are looking for, will come out in same units as we put in “time elapsed”

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