Bresser National Geographic 9118300 Mode D'emploi page 30

Use of the moon filter
If the image of the moon is too bright for you, you can screw the green moon filter (17) into the bottom of
the thread of the eyepiece (15). Then you can set the eyepiece normally into the zenith mirror (16). The
image that you see by looking through the eyepiece is now greenish. The moon appears less bright, so
observation is more pleasant.
Notes on cleaning
• Clean the eyepieces and lenses only with a soft, lint-free cloth, like a microfibre cloth. To avoid scratching
the lenses, use only gentle pressure with the cleaning cloth.
• To remove more stubborn dirt, moisten the cleaning cloth with an eyeglass-cleaning solution, and wipe
the lenses gently.
• Protect the device from dust and moisture. After use, particularly in high humidity, let the device ac-
climatize for a short period of time, so that the residual moisture can dissipate before storing.
Possible observation targets
The following section details several interesting and easy-to-find celestial objects you may want to
observe through your telescope. The pictures show what the objects will look like through your tel-
escope's eyepiece.
Moon
f=20 mm
Constellation Orion:
The Orion Nebula (M 42)
f=20 mm
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The moon is Earth's only natural satellite.
Diameter: 3,476 km / Distance: 384,400 km from
Earth (average)
The moon has been known to humans since prehis-
toric times. It is the second brightest object in the
sky, after the sun. Because the moon circles the
Earth once per month, the angle between the Earth,
the moon and the sun is constantly changing; one
f=6 mm
sees this change in the phases of the moon. The
time between two consecutive new moon phases is
about 29.5 days (709 hours).
Right Ascension: 05
Declination: -05° 22' (Degrees : minutes)
Distance: 1,344 light years from Earth
Though it is more than 1,344 light years from Earth,
the Orion Nebula (M 42) is the brightest diffuse
nebula in the sky. It is visible even with the naked eye
and a worthwhile object for telescopes of all types
and sizes. The nebula consists of a gigantic cloud
f=6 mm
of hydrogen gas with a diameter of hundreds of light
years.
35 (hours : minutes) /
h m