Consider the dome of the sky over our heads
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Consider the dome of the sky over our heads…. mixing bowl. Consider the dome of the sky over our heads…. inverted mixing bowl …. Celestial Sphere: Extension of the Earth ’ s Coordinates. celestial sphere N/S celestial poles celestial equator. Like a salad bowl over your head!.

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Consider the dome of the sky over our heads

Consider the dome of the sky over our heads….

mixing bowl


Consider the dome of the sky over our heads1

Consider the dome of the sky over our heads….

inverted mixing bowl ….


Consider the dome of the sky over our heads

Celestial Sphere: Extension of the Earth’s Coordinates

  • celestial sphere

  • N/S celestial poles

  • celestial equator

Like a salad bowl over

your head!


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


Zodiacal signs vs constellations

Zodiacal signs vs. Constellations

  • “Constellation” is a modern, well-defined term

    • - Some constellations are big, some are small on the celestial sphere

  • “Zodiacal sign” is the old way of dividing the year and the Sun’s path into 12 equal parts

  • zodiacal sign is exactly 30 degrees “long”


The ecliptic

The Ecliptic

  • The sun appears to move along a plane in the sky referred to as the ecliptic.

  • The other planets also appear to move close to the ecliptic.


Consider the dome of the sky over our heads

Sun

Gemini

Taurus

Leo

Cancer

Aries

 East

West 

South

If you could see stars during the day, the drawing below shows what the sky would look like at noon on a given day. The Sun is near the stars of the constellation Gemini. Near which constellation would you have expect the Sun to be located at sunrise on this day?

  • Leo

  • Cancer

  • Gemini

  • Taurus

  • Aries

0/0


At what time will star b be located high in the northwestern sky

Celestial Sphere Rotation

Path of Star B

Celestial Sphere

Path of Star A

4

North Star

2

3

North Star

Earth’s Equator

Horizon

6 PM

Celestial Sphere Rotation

North

At what time will Star B be located high in the Northwestern sky?

  • 4:00 am

  • 10:00 am

  • 2:00 pm

  • 7:00 pm

  • 1:00 am


Consider the dome of the sky over our heads

Celestial Sphere Rotation

Path of Star B

Celestial Sphere

1

Path of Star A

4

North Star

2

3

North Star

Earth’s Equator

Horizon

6 PM

Sphere Rotation

North

If you were able to see the motion of star B be at Noon, over a period of 15 minutes what direction would it appear to move?

  • west (to the left)

  • east (to the right)

  • South (out of the page)

  • away from the horizon (up)

  • toward the horizon (down)


Hipparchus

Hipparchus

  • Lived about 150 BC

    • 850 Star Positions

    • Defined Magnitudes

    • Discovered Precession

Cataloger of the Heavens


Consider the dome of the sky over our heads

Precession of the rotation axis


Consider the dome of the sky over our heads

Precession causes the north celestial pole to drift among the stars, completing a circle in 26,000 years.


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