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Summary: Week 1 - 1 Positional Astronomy Introduction
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Read the summary and the most important questions on Week 1 - 1 Positional Astronomy Introduction
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1 Week 1 - 1 Positional Astronomy Introduction
This is a preview. There are 3 more flashcards available for chapter 1
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What objects are visible in the night sky with the human eye or with a telescope?
Galaxies, star clusters, stars, nebulae -
How many regions are in the Northern Hemisphere?
88 regions. Each region is associated with a constellation. -
2 Week 1 - 2 The Celestial Sphere
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What is the celestial sphere?
An imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface -
How do you determine your coordinates on Earth?
Latitude and longitude -
What is right ascension (or RA)?
Celestial longitude measured in hours to the East. In other words, it is the celestial equivlent of longitude. (source: http://en.wikipedia.org/wiki/Right_ascension) -
3 Week 1 - 3 The Local View
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What info is required to describe a star's position?
Location of the local meridian, star's altitude, & star's azimuth -
4 Week 1 - 4 Sidereal Time
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What is a circumpolar star?
A star that never sets from the perspective of a given pole -
What is sidereal time?
The celestial meridian coinciding with the local meridian -
5 Week 1 - 5 Where is the Sun?
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When does sidereal time (ST) equal local time (LT)?
September 21 -
True of False? The Sun is fixed on the celestial sphere
FALSE
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