Bedienungsanleitung Bresser 4701102 (Seite 35 von 40) (Englisch)

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Some tips

You will have noticed that objects observed through the telescope appear upside down

and upside down. This is the case with every astronomical telescope for physical reasons

and does not play a role in stellar observation.

Due to the rotation of the earth, all celestial objects seem to move slowly through the

visual field. To compensate for this movement, all you have to do is slowly and evenly

adjust the telescope. The higher the magnification, the more practice is required in order

to achieve uniform tracking.

To compensate, you can also place the object on the eastern edge of the visual field and

then observe it at rest with the tube released as it slowly moves through the visual field.

Onceithasreachedthewesternedge,itisbriefly"pushedback"again.

Vibrations: Avoid touching the eyepiece during observation. This or the slight trembling

of a hand leads to restless images. Avoid observation sites with ground vibrations if

possible (e.g. near railway lines or construction sites)

Dark adaptation: Allow your eyes to get used to the darkness. This dark adaptation lasts

about15to20minutesandstartsanewaftereach-evenshort-lightdisturbance.Use

alampwitharedfilter,e.g.toreadmapsorworkonthetelescope;weakredlighthardly

disturbs the dark adaptation of the eyes.

Observing through windows (whether open or closed) is very unfavourable. The light

collected by the telescope must penetrate several layers of glass or air, which leads to

considerable image disturbances.

Planets and other objects, when close to the horizon, are strongly influenced by air

turbulence and extinction. Here it is always worthwhile to place the observation at a

time when they are as high as possible in the sky. Switch to an eyepiece with a lower

magnification when the image is flickering or cloudy. Choosing a magnification that is too

high is a mistake that is very common in beginners.

Warm clothes: Even in summer it can get very cool on clear nights, especially in the

mountains. Take warm clothes such as sweaters, caps, gloves, thicker socks etc. with

you to the observation site - even on the most beautiful night, observing is no fun if you

are cold!

Explore your observation site by light: It should be located away from roads and other

light sources that would prevent dark adaptation. Fog can often form near water at night

and the ground itself should be firm and relatively flat. You can also watch from the city,

but consider if you have the opportunity to go to a place further away. Really good sky

conditionsoftenonlyexistabout50kmawayfrombigcitiesorconurbations.There'san

oldastronomer'ssaying:"Adarkskycannotbereplacedbyanythingbutadarkersky!"

Further information: As already mentioned above, the Internet and specialist journals

provide a wide range of information for every age group. Good literature can often be

found in libraries and city libraries. Also look for astronomical associations in your area

- events are usually announced in local newspapers. A comprehensive list of clubs and

observatoriescanbefoundatwww.astronomie.de/gad

Appendix

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