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Does the stars move parallel to the horizon or at a large angle to the horizon?
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What is the difference between seasonal and circumpolar constellations?
Circumpolar stars/constellations always stay above our horizon, if they go below our horizon than they are no longer circumpolar.
Stars in the night sky always maintain the same distance from what?
Stars in the night sky always maintain the same distance to what? The sun, the moon, the horizon or the celestial meridian?
Why some stars visible in march but not visible in September?
Because, e stars are in the sky in the same time of the year. In March, they appear high above the horizon, and in September they appear low.
Why is light from stars and planets considered to be parallel light?
The Sun, planets and stars are extremely far away from us ; hence, the rays reaching us diverge only very slightly. This results in parallel light rays, for all practical purposes.
Do stars set below the horizon at the same time each night?
No, they actually set four minutes earlier every night.
What do you use to measure the angle of a star?
The device that astronomers use to find the angle between the horizon and stars in the sky is called a sextant.
Why stars appear slightly above the horizon?
the sun is at sunset that way so the horizon is a bit dark
Why must astrolabes be level in science?
When navigating by the stars, or measuring an angle, there has to be a reference point. Oftentimes, we assume that a measurement is referenced to a particular point. (For example, a compass gives degrees in reference to magnetic north, not true north.) However, the use of a reference point is very important. In celestial navigation, the height, or angle, of certain stars and constellations is measured in reference to the horizon. Basically, you take the angle your astrolabe/sextant/stadimeter, whatever, and measure the angle from the horizon to the star. This forms a rough triangle with vertices at your location, the point of the Earth beneath the star, and the star itself. Obviously this is not terribly accurate, so you need to figure in a calculation taking into account the curvature of the Earth, and the expected position of the star. By using the correction and Nautical Almanac, you can create an ellipse that your ship must lie on if it is on the Earth's surface. Take measurements from two or more stars and find where they intersect--that's roughly (+-50mi or so) your position. The importance of shooting the horizon (i.e. being level) is apparent in the definition of Nautical Twilight--the level of light where you can use both the horizon and major stars as reference points.
Why dont stars get sucked into black holes?
Stars do get sucked into a black hole if they pass the event horizon.
What direction does Orion's stars go?
In the "Southern Horizon" in every direction.
What is special about circumpolar stars?
A circumpolar star never sets below your horizon.
How do available stars differ from other stars in the sky?
The available ones are above the horizon in a dark sky. The other ones are unavailable.
Is it normal to view a large bright star from the same angle regardless of how many times a person changes location on the ground?
Yes. The stars are so distance that changing your location on earth will have a negligible effect on the angle at which you view it.
What instrument is used to help locate a position by using stars and their degree from the horizon?
An Astrolabe.
What apparent path would stars take if you were to look toward the Eastern horizon?
Up.
Circumpolar stars can be seen all night long during the entire year because they are?
Always above the horizon at your latitude. In the northern hemisphere this will be the northern horizon and the reverse for the southern hemisphere.
What is the difference between seasonal and circumpolar constellations?
Circumpolar stars/constellations always stay above our horizon, if they go below our horizon than they are no longer circumpolar.
