OBSERVING THE SKY Chapter 1 Chapter 3 Constellations and Navigation Constellations and Navigation ORIGINS OF ASTRONOMY.

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Presentation transcript:

OBSERVING THE SKY Chapter 1 Chapter 3

Constellations and Navigation Constellations and Navigation ORIGINS OF ASTRONOMY

CELESTIAL SPHERE

FLASHCARDFLASHCARD Let’s say we find a star that is located on the points or circles in the sky listed below.Then on the same night we move to a location that is some significant distance from our first location. There will now be a different star on A) the celestial north pole B) the zenith C) the celestial equator D) all of the above

APPARENT SKY ROTATION

STAR CIRCLES

STAR TRAILS NEAR THE POLE

EQUATORIAL STAR TRAILS

INTERMEDIATE LATITUDE STAR TRAILS

FLASHCARDFLASHCARD Imagine Canadian troops are stationed in a country located on the equator. Which of the following would be familiar to them (the same at the equator as in Canada)? A) the celestial poles are on the north and south points of the horizon B) the celestial equator is overhead and passes through the zenith C) all stars rise and set D) none of the above are the same on the equator as in Canada

STAR TRAILS

FLASHCARDFLASHCARD ALL CONSTELLATIONS NORTH OF WHAT LATITUDE ARE CIRCUMPOLAR FROM VANCOUVER? (Latitude of Vancouver is 49 degrees) A) 0 degrees B) 41 degrees C) 49 degrees D) 90 degrees

EARTH’S PRECESSION

ORIGINS of ASTRONOMY Constellations and Navigation Constellations and Navigation Constellations and Timekeeping Constellations and Timekeeping ä ä Daily rotation of sky is a unit of time = 1 day

FLASHCARDFLASHCARD FOR ABOUT HOW LONG WAS THE CAMERA OPEN IN THIS PICTURE? A) 30 seconds B) 5 minutes C) 2 hours D) 5 hours

The Spinning Earth How do we know that the Earth is spinning on its axis? Is it not possible that the Earth does not spin and the sky spins around the Earth?

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere ä Foucault Pendulum

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere ä Foucault Pendulum ä Velocity of Moon at Rising and Setting

PHASES of the MOON

FLASHCARDFLASHCARD AT WHAT TIME DOES THE WAXING CRESCENT MOON SET? A) 9:00 AM B) 3:00 PM C) 9:00 PM D) MIDNIGHT

FLASHCARDFLASHCARD AT WHAT TIME DOES THE FIRST QUARTER MOON RISE? A) 9:00 AM B) NOON C) 9:00 PM D) MIDNIGHT

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere ä Foucault Pendulum ä Velocity of Moon at Rising and Setting

PHASES of the MOON

ECLIPSE GEOMETRY New New NewNew 5º5º5º5º Full Full FullFull Earth’s Orbit

ECLIPSE GEOMETRY

FLASHCARDFLASHCARD WHAT IS THE SHORTEST POSSIBLE PERIOD OF TIME BETWEEN A SOLAR AND A LUNAR ECLIPSE? A) 1 Day B) 1 Week C) 2 Weeks D) 1 month

SOLAR ECLIPSE GEOMETRY

SOLAR ECLIPSE

SOLAR ECLIPSE 2008

LUNAR ECLIPSE

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere ä Foucault Pendulum ä Velocity of Moon at Rising and Setting ä Long Range Projectiles

EARTH SPINS on its AXIS l Evidence of Earth’s Spin ä Daily rotation of Celestial Sphere ä Foucault Pendulum ä Velocity of Moon at Rising and Setting ä Long Range Projectiles ä Prevailing Wind Circulation

CONCLUSIONS REGARDING SPIN of EARTH Earth rotates once per day from west to east (counter-clockwise as seen from above the north pole) about an axis that passes through the north and south poles. Celestial sphere North celestial pole South celestial pole Celestial equator

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