Midterm

Front 1

Angle of Azimuth

Back 1

angle along horizon from North to direction of the object in question

Front 2

Declination

Back 2

one of two ways position of stars is determined; corresponds with latitiude

Front 3

Right Ascension

Back 3

one of two ways position of stars is determined; corresponds with longitude

Front 4

Ecliptic

Back 4

apparent path along which the sun moves across the celestial sphere

*Equinoxes are points where ecliptic crosses CE

*Solstices are points where sun is furthest from CE

Front 5

Refractor Telescope

Back 5

uses a lens as an objective element

*Pros: large objective; smaller domes
*Cons: hard to clean; secondary blocks light

Front 6

Reflector Telescope

Back 6

uses a concave mirror to focus the incoming light

*Pros: large image (high magnification)

*Cons: doesn't support heavy equipment; chromatic aberration

Front 7

Catadioptric Telescope

Back 7

uses a combination of a mirror and lens to focus the incoming light

*Pros: easy to clean; supports heavy equipment

*Cons: expensive; secondary blocks light

Front 8

2 Focal Arrangements

Back 8

Reflector

1. Newtonian

2. Cassegrain

*both use secondary mirror to direct the light beam to a convenient eyepiece position

Front 9

Resolving Power of a Telescope

Back 9

ability to separate fine detail and distinguish objects that are very close to one another.
*Directly proportional to its aperature

Front 10

Light Gathering Power

Back 10

amount of light collected and focused by its objective

*Depends on aperature squared

Front 11

Magnifying Power

Back 11

how much larger an image appears when viewed through a telescope than with the unaided eye

*Depends on focal length of telescope and eyepiece; divide focal length of telescope by focal length of eyepiece

*highest magnification requires eyepiece with smallest focal length

(ex: telescope with 1600mm FL, use 40mm magnification

Front 12

Sky Globe

Green Horizontal Bar

Back 12

observer's horizon

Front 13

Sky Globe

Red Line

Back 13

celestial equator

Front 14

Sky Globe

Yellow Line

Back 14

ecliptic

Front 15

Sky Globe

Green Vertical Arc

Back 15

meridian

Front 16

Sky Globe

Orange/Pink Ball

Back 16

sun

Front 17

Sky Globe

Clear Plastic Sphere

Back 17

celestial sphere

Front 18

Sky Globe

Point at top of Green Vertical Arc

Back 18

zenith

Front 19

Sky Globe

Regions separated by dotted lines

Back 19

constellations

Front 20

Sky Globe

Yellow Dial

Back 20

clock

Front 21

Finderscope

Back 21

small attached telescope with a wide field of view; useful for getting close to target

Front 22

Focus Knob

Back 22

makes small adjustments to position of eyepiece to align focal points & bring image into proper focus

Front 23

Fine Adjustment Knob

Back 23

makes small adjustments to RA or DEC in order to accurately dial in the location of desired target

Front 24

Axis Clamps

Back 24

Clamp the axis of rotation secure; can be opened to freely move the telescope, by hand, to appx the desired location

Front 25

Eyepiece

Back 25

secondary lens of telescope; responsible for directing the image to the eye. Its focal length is used in calculations such as "magnification"

Front 26

Setting Circles

Back 26

calibrating circles used for displaying equatorial coordinates (RA & DEC) of observer's target