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Seasonal Motion. 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

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The zodiac throughout the year
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
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
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
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
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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