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Keep Looking Up PowerPoint PPT Presentation


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Keep Looking Up. Topic 2 Part 1. ``Astronomy compels the soul to look upward and leads us from this world to another.'' - Plato. Early Astronomy. Early Models. Big Dipper. Orion. Scorpio. The celestial sphere appears to rotate about the celestial poles (completing one cycle in one day).

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Keep looking up

Keep Looking Up

Topic 2

Part 1


Astronomy compels the soul to look upward and leads us from this world to another plato

``Astronomy compels the soul to look upward and leads us from this world to another.'' - Plato


Early astronomy

Early Astronomy


Early models

Early Models


Big dipper

Big Dipper


Orion

Orion


Scorpio

Scorpio


The celestial sphere appears to rotate about the celestial poles completing one cycle in one day

The celestial sphere appears to rotate about the celestial poles (completing one cycle in one day).


Keep looking up

  • Celestial north pole stays still (North star aka Polaris)

  • Stars appear to move in counterclockwise fashion.


Keep looking up

Question: What causes the observed circular motions of the stars, Sun, Moon, and planets about the celestial pole?

  • Hypothesis 1: The Earth is stationary, and the stars, Sun, Moon, and planets revolve around it.

  • Hypothesis 2: The stars, Sun, Moon, and planets are not revolving about the Earth; it is the Earth which is rotating about its polar axis, once per day.


This or that

This or that?


The sun moves west to east relative to the stars completing one cycle in one year

The Sun moves west to east relative to the stars (completing one cycle in one year).


Question what causes this apparent motion of the sun relative to the background stars

Question: What causes this apparent motion of the Sun relative to the background stars?

  • Hypothesis 1: The Earth is stationary, and the Sun revolves around it at a slightly slower rate than the celestial sphere does.

  • Hypothesis 2: The Earth revolves around the Sun, once per year.


This or that1

This or that?


The moon moves west to east relative to the stars completing one cycle in one month

The Moon moves west to east relative to the stars (completing one cycle in one month).


Question what causes this apparent motion of the moon relative to the background stars

Question: What causes this apparent motion of the Moon relative to the background stars?

  • Hypothesis 1: The Earth is stationary at the center of the universe, and the Moon revolves around it a a slower rate than the celestial sphere does.

  • Hypothesis 2: The Moon revolves around the rotating Earth, once per month.


The planets sometimes move west to east sometimes east to west relative to the stars

The planets sometimes move west to east, sometimes east to west, relative to the stars.


Wanderers

Wanderers

  • Only 5 planets to the naked eye.

  • Mercury, Venus, Mars, Jupiter, Saturn


This or that2

This or that?


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