Manual Celestron POWERSEEKER 80 EQ - 21048 (page 7 of 19) (English)

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Inverted image, as viewed with

the eyepiece directly in telescope

Actual image as seen with the

unaided eye

ure 7

Focusing

To focus your telescope, simply turn the focus knob located directly below the eyepiece holder. Turning the knob clockwise

allows you to focus on an object that is farther than the one you are currently observing. Turning the knob counterclockwise

from you allows you to focus on an object closer than the one you are currently observing.

• If you wear corrective lenses (specifically glasses), you may want to remove them when observing with an eyepiece

attached to the telescope. However, when using a camera you should always wear corrective lenses to ensure the

sharpest possible focus. If you have astigmatism, corrective lenses must be worn at all times.

The Celestial Coordinate System

To help find objects in the sky, astronomers use a

celestial coordinate system that is similar to our

geographical coordinate system here on Earth. The

celestial coordinate system has poles, lines of

longitude and latitude, and an equator. For the most

part, these remain fixed against the background stars.

The celestial equator runs 360 degrees around the

Earth and separates the northern celestial hemisphere

from the southern. Like the Earth's equator, it bears a

reading of zero degrees. On Earth this would be

latitude. However, in the sky this is referred to as

declination, or DEC for short. Lines of declination

are named for their angular distance above and below

the celestial equator. The lines are broken down into

degrees, minutes of arc, and seconds of arc.

Declination readings south of the equator carry a

minus sign (-) in front of the coordinate and those north of the celestial equator are either blank (i.e., no designation) or

preceded by a plus sign (+).

Figure 8

The celestial sphere seen from the outside showing R.A. and DEC

The celestial equivalent of longitude is called Right Ascension, or R.A. for short. Like the Earth's lines of longitude, they

run from pole to pole and are evenly spaced 15 degrees apart. Although the longitude lines are separated by an angular

distance, they are also a measure of time. Each line of longitude is one hour apart from the next. Since the Earth rotates

once every 24 hours, there are 24 lines total. As a result, the R.A. coordinates are marked off in units of time. It begins with

an arbitrary point in the constellation of Pisces designated as 0 hours, 0 minutes, 0 seconds. All other points are designated

by how far (i.e., how long) they lag behind this coordinate after it passes overhead moving toward the west.

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Celestron POWERSEEKER 80 EQ - 21048 Manual

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