02_NightSky - What we see when we look up Patterns in the...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
What we see when we look up Patterns in the Sky h Motions in the Sky The Circling Sky > the rotation of the Earth about its axis The Reason for Seasons > the Earth’s orbit around the Sun Precession of the Earth’s Axis > the wobbling of Earth’s axis The Moon, Our Constant Companion > the Moon’s orbit around the Earth The Ancient Mystery of the Planets > the various planets’ orbits around the Sun day day year year month month week week
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A Constellation is… … a region of the sky, within official borders set in 1928 by the IAU. Often recognizable by a pattern or grouping of stars. Some patterns, like the Winter Triangle, span several constellations.
Background image of page 2
Constellations Most official constellation names come from antiquity. Some southern hemisphere constellations were named by European explorers in the 17 th th centuries. The patterns of stars have no physical significance! Stars that appear close together may lie at very different distances. Modern astronomers use them as landmarks.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Celestial Sphere The sky above looks like a dome…a hemisphere. . If we imagine the sky around the entire Earth, we have the celestial sphere . This a 2-dimensional representation of the sky h Because it represents our view from Earth, we place the Earth in the center of this sphere.
Background image of page 4
Some Terms Celestial Equator Celestial Poles Ecliptic
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The Circling Sky What are the basic features of the local sky? How does the sky vary with latitude? Why are some stars above the horizon at all times? How does the night sky change through the year? Some Questions:
Background image of page 6
The Daily Motion As the Earth rotates, the sky appears to us to rotate in the opposite direction. The sky appears to rotate around the N (or S) celestial poles. If you are standing at the poles, nothing rises or sets. If you are standing at the equator, everything rises & sets 90 ° to the horizon.
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Some stars never set (circumpolar), others never rise. Many stars, (& Sun, Moon, planets) rise in East and set
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/06/2011 for the course AST 2002 taught by Professor Britt during the Spring '08 term at University of Central Florida.

Page1 / 47

02_NightSky - What we see when we look up Patterns in the...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online