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Science-Chapter 3
3B - Mapping the Stars
17
Science
8th Grade
09/22/2009

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Cards

Term

3B-1

What two methods do astronomers have for describing where in the sky an object may be found?

Definition

1) by what constellation the star is on

2) by its coordinates

Term

3B-1

What do astronomers call a named area in the sky with imaginary boundaries running north, south, east, and west?

Definition
constellation
Term

3B-1

Who introduced an orderly system for identifying particular stars within a constellation?

Definition
Johann Bayer
Term

3B-1

How many modern constellations are there?

Definition
88
Term

3B-1

How did Bayer generally designate the brightest or principal star in a constellation?

Definition
by assigning Greek letters to the most prominent, alpha (a) is the brightest
Term

3B-1

What is the proper name for Delta Ursae Majoris?

Definition
Alkaid
Term

3B-1

(True or False) The collection of ancient constellations completely covers the entire area of the sky.

Definition
False
Term

3B-1

What is latitude?

Definition
distance in degrees north or south of the equator
Term

3B-1

What is longitude?

Definition
distance in degrees east or west of the prime meridian passing though Geenwich, England
Term

3B-1

What were constellations originally patterned after?

Definition
they formed pictures that were similar to familiar objects, people or animals
Term

3B-2

Celestial latitude, or the angular distance between the celestial equator and a celestial object in degrees north or south, is called by what other name?

Definition
declination (DEC)
Term

3B-2

What math symbol is used for celestial coordinates north of the celestial equator? south?

Definition
+ sign for north; - minus sign for south
Term

3B-2

What is the term that refers to celestial longitude?  What units is it measured in?

Definition
right ascension (RA); it is measured in hours
Term

3B-2

From what reference point is RA measured?  Where is this point located in the sky?

Definition
prime hour circle; vernal equinox
Term

3B-2

As the earth turns one hour, how many degrees does it turn?

Definition
15 deg.
Term

3B-2

What is the approximate declination of Polaris, the North Star?

Definition
90 deg. N
Term

3B-2

(True or False) The earth's revolution around the sun changes both the right ascension and the declination of a star.

Definition
False
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