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Unformatted text preview: The path of the Sun’s center on the celestial sphere as seen from Earth.
Elongation – The angular separation of two celestial bodies. For Mercury and Venus
the greatest elongation occurs when they are at their most angular distance from the
Sun as viewed from Earth.
Galaxy – A mass of up to several billion stars held together by gravity.
Globular Star Cluster – A ball-shaped group of several thousand old stars.
Light Year (ly) – The distance a beam of light travels at 300,000 km/sec in one year.
Magnitude – The brightness of a celestial object as it appears in the sky.
Open Star Cluster – A group of tens or hundreds of relatively young stars.
Opposition – When a celestial body is opposite the Sun in the sky.
Planetary Nebula – The remnants of a shell of gas blown off by a star.
Universal Time (UT) – A time system used by astronomers. Also known as Greenwich
Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT.
Variable Star – A star that changes brightness over a period of time. MARCH 2014 CELESTIAL OBJECTS Listed on this page are several of the brighter, more interesting celestial objects
visible in the evening sky this month (refer to the monthly sky map). The objects are
grouped into three categories. Those that can be easily seen with the naked eye (that
is, without optical aid), those easily seen with binoculars, and those requiring a
telescope to be appreciated. Note, all of the objects (except single stars) will
appear more impressive when viewed through a telescope or very large
binoculars. They are grouped in this way to highlight objects that can be seen using
the optical equipment that may be available to the star gazer. NORTHERN HEMISPHERE About the Celestial Objects Easily Seen with the Naked Eye
UMi The 6th brightest star. Appears yellowish in color. Spectroscopic binary. Dist=42 ly.
Orange, giant K star. Name means "bear watcher". Dist=36.7 ly.
The brightest star in the sky. Also known as the "Dog Star". Dist=8.6 ly.
Greek name meaning "before the dog" - rises before Sirius (northern latitudes). Dist=11.4 ly....
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This homework help was uploaded on 03/25/2014 for the course ASTRO 1400 taught by Professor Holtz during the Spring '10 term at Texas Tech.
- Spring '10