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ASTR 1345-001, Textbook Chapter 1 Notes

by: Miranda Notetaker

ASTR 1345-001, Textbook Chapter 1 Notes ASTR 1345-001

Marketplace > University of Texas at Arlington > Astronomy > ASTR 1345-001 > ASTR 1345 001 Textbook Chapter 1 Notes
Miranda Notetaker
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About this Document

This is just a quick overview of important things from the textbook in chapter 1 just in case you don't feel like reading the whole thing!
Nilakshi Veerabathina
Class Notes
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This 4 page Class Notes was uploaded by Miranda Notetaker on Tuesday September 13, 2016. The Class Notes belongs to ASTR 1345-001 at University of Texas at Arlington taught by Nilakshi Veerabathina in Fall 2016. Since its upload, it has received 23 views. For similar materials see Astronomy in Astronomy at University of Texas at Arlington.

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Date Created: 09/13/16
ASTRONOMY Discovering the Universe Textbook Notes Chapter 1  Scientific notation makes comparisons easy  Astronomy uses other fields of sciences and brings them together  Clusters: groups of galaxies o Held together by gravity  Asteroids/Meteoroids: rock and metal together to make bits of space debris  Black holes: objects in space which have a very strong gravitational attraction  Star Patterns o Asterism: group of bright stars o Constellation: entire region of the sky and everything in it o People often use the word “constellation” to casually describe an asterism. o The sky is divided into 88 constellations. o Pointer stars: bright stars that point to other important celestial objects, such as other stars or constellations o The Big Dipper can help you to find other constellations by:  First, find the two pointer stars on the edge of the “bowl” farthest from the handle of the Big Dipper  Then, follow those to Polaris (or the North Star)  You can then orient yourself and find the other constellations o Different constellations are visible at different times o The “Winter Triangle” is made up of different stars from Orion, Canis Major, and Canis Minor. o The “Summer Triangle” is made up of the star Vega from Lyra, Deneb in Cygnus, and Altair from Aquila. o Celestial sphere: a made-up sphere where Earth is the center and all the stars and other celestial objects are in different coordinates around the Earth o The celestial equator, celestial North Pole, and the celestial South Pole are just the extensions of the Earth’s equator, North Pole, and South Pole onto the celestial sphere.  Earthly Cycles o Diurnal motion: Earth’s daily rotation o Sidereal period: the length of any cycle of motion that is measured relative to the stars o Sidereal day: the time it takes for the Earth to rotate on its axis exactly one time o Solar day: the time it takes for the Earth to rotate on its axis enough for the same point to point back at the Sun (longer than a sidereal day because of the variations due to the Earth’s non- circular orbit) o The higher the Sun rises during the day, the more daylight hours there are. o Time zone: place on the Earth that shares a uniform time for commercial and social purposes o There are 24 time zones on the Earth  Calendar o Changed a looottttt!!!! o We use the Gregorian calendar (also called the Western calendar)


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