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Celestron ASTROMASTER 70AZ Manual

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With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both
solar system and deep sky objects as well as general observing conditions which will affect your ability to observe.
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Often, it is tempting to look at the Moon when it is full. At this time, the
face we see is fully illuminated and its light can be overpowering. In
addition, little or no contrast can be seen during this phase.
One of the best times to observe the Moon is during its partial phases
(around the time of first or third quarter). Long shadows reveal a great
amount of detail on the lunar surface. At low power you will be able to
see most of the lunar disk at one time. Change to optional eyepieces for
higher power (magnification) to focus in on a smaller area.
Lunar Observing Hints
To increase contrast and bring out detail on the lunar surface, use optional filters. A yellow filter works well at improving
contrast while a neutral density or polarizing filter will reduce overall surface brightness and glare.
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Other fascinating targets include the five naked eye planets. You can see
Venus go through its lunar-like phases. Mars can reveal a host of surface
detail and one, if not both, of its polar caps. You will be able to see the
cloud belts of Jupiter and the great Red Spot (if it is visible at the time
you are observing). In addition, you will also be able to see the moons of
Jupiter as they orbit the giant planet. Saturn, with its beautiful rings, is
easily visible at moderate power
.
Planetary Observing Hints
• Remember that atmospheric conditions are usually the limiting factor
on how much planetary detail will be visible. So, avoid observing the
planets when they are low on the horizon or when they are directly over a source of radiating heat, such as a rooftop or
chimney. See the "Seeing Conditions" section later in this section.
• To increase contrast and bring out detail on the planetary surface, try using Celestron eyepiece filters.
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Although overlooked by many amateur astronomers, solar observation is both rewarding and fun. However,
because the Sun is so bright, special precautions must be taken when observing our star so as not to damage your
eyes or your telescope.
For safe solar viewing, use a solar filter that reduces the intensity of the Sun's light, making it safe to view. With a
filter you can see sunspots as they move across the solar disk and faculae, which are bright patches seen near the
Sun's edge.
• The best time to observe the Sun is in the early morning or late afternoon when the air is cooler.
• To center the Sun without looking into the eyepiece, watch the shadow of the telescope tube until it forms a
circular shadow.
… 15 …


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