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qu.1.1.name=Coordinate Systems IV@
qu.1.1.question=<P>Coordinate systems can help us to determine how star trails will appear and which stars we can see from specific <1>.  
At any one time, every observer on Earth can see <2> of all the stars (weather conditions pending).</p>
<br>
<P>Stars can be classified into three sets by an observer.  Circumpolar stars are visible <3> .  Rise and set stars are those that 
change with the season and rise and set every <4> .  Never rise stars are stars that are always below <5>.</p>
<br>
<P><STRONG>Examples</strong>
<UL>
<LI>For an observer at 90&deg;N (the <6>) all stars north of the celestial equator are <7> .
<LI>For an observer at 0&deg;, all stars are <8> and make very <9> star trails near the eastern and western horizons.
<LI>For an observer at 33&deg;N, the circumpolar stars are those from <10> .
<LI>For an observer at 2&deg;S, the Celestial Equator is at an altitude of <11> and the never rise stars are found from <12>.
</ul>
<BR>
<P>The sun appears always inside the ecliptic within a band of width of <13> and the moon and planets appear within a band of roughly<14>.</p>@

qu.1.1.blank.1=latitudes, altitudes, longitudes, celestial poles@
qu.1.1.blank.2=half, most, one-quarter, one-third@
qu.1.1.blank.3=all of the time, half of the time, never, only above the horizon@
qu.1.1.blank.4=night, 28 days, three months, 12 hours@
qu.1.1.blank.5=the horizon plane, 49 degrees N, the ecliptic, the zenith@
qu.1.1.blank.6=North Pole, equator, North Celestial Pole, zenith@
qu.1.1.blank.7=circumpolar, visible, rise and set, never rise@
qu.1.1.blank.8=rise and set, circumpolar, visible, never rise@
qu.1.1.blank.9=vertical, horizontal, short, parallel@
qu.1.1.blank.10= +57 degrees=> +90 degrees, -57 degrees => -90 degrees, +33 degrees => +90 degrees, -57&deg; => +57 degrees@
qu.1.1.blank.11= 88 degrees,-2 degrees, 2 degrees, -48 degrees@
qu.1.1.blank.12= +88 degrees => +90 degrees, -90 degrees=> -88 degrees, -88 degrees => +88 degrees,  -90 degrees => +2 degrees@
qu.1.1.blank.13= 47 degrees, 23.5 degrees,60 degrees, 31 degrees@
qu.1.1.blank.14= 60 degrees, 23.5 degrees, 47 degrees, 31 degrees@

qu.1.1.grader.1=menu@
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qu.1.1.grader.11=menu@
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qu.1.1.grader.13=menu@
qu.1.1.grader.14=menu@