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What is the zenith and how does the definition of the horizon relate to it?
The zenith is the direction directly above the observer. The astronomical horizon is the plane that is perpendicular to that direction, i.e. horizontal. The "true horizon", however, is the cone from the observer to the point on the earth, below which you can not "see over", so it is a small amount lower in angle. In practice, the two horizons can be considered to be the same, because the height of the observer is often small in comparision to the diameter of the earth, unless the observer is standing on a tall point, such as a mountain.
Why don't upright objects cast a shadow when the sun is at its zenith?
The shadow is formed exactly below the object. So it cannot be seen.
Why did greek scientist study the circumference of earth?
Greek scientists study the circumference of earth because science flourishes the Hellenistic era.
Is summer when you are facing the sun?
It is day when you are facing the sun, and night when you are not. The seasons depend upon the maximum angle of the sun to the earth during the day. When the sun reaches it's zenith (highest point), that is the summer solstice--the day on which summer begins. Summer ends when the day and night have shortened to equal lengths--the equinox (equal night). Solstice in the northern hemisphere is, incidentally, when the morning sun appears to "stand still" on the horizon. Every day in the spring the sun rises further and further south each day, reaching its southernmost point at the solstice. The further north you go, the lower the sun falls on the horizon. At 45 degrees north, the sun reaches a height of only 45 degrees at high noon on the summer solstice. The solstices and equinoxes, incidentally, mark the boundaries of the four seasons. That's why we say summer begins long after it has gotten hot, and winter doesn't begin until December 21st or thereabouts, even though it is cold and snowy long before then.
The theory of the origin of the universe accepted by scientists today?
The currently accepted theory remains the 'Big Bang' theory- that is, that about 13.7 billion years ago all the matter that existed in the Universe was concentrated into one single incredibly tiny point, which then began to expand rapidly and is still doing so even today. In 1992 the NASA project COBE found evidence of 'hot spots' in mircrowave energy on the outer fringes of the known Universe, which tended to support this theory. As to what created the materials and conditions that ennabled the Universe to be created in the first place, this is hotly debated. Many people believe that it was God, others that it may have been some extraterrestrial intelligence of such a high order that it lies beyond our comprehension but has a scientific, rather than a spiritual, origin. A few think it was just chance, but this latter viewpoint is slowly becoming dismissed by all but the most hardened cynical physicists, having reached it's zenith in the 1970s and early '80s. Not all physicists or other types of scientists are atheist by any means, but even those that are, are at a loss to account for why the Universe should have come into being!!
What is an imaginary point in the sky directly above the observers head?
The zenith.
From the horizon to the observer's zenith is an angle of?
30 degrees for observers at a latitude of 30 degrees north
What bright stars are near the zenith during the summer?
That depends on your latitude. Also, it does NOT depend on the season. If a star passes near the zenith in Summer, it will also pass near the Zenith in Winter, although it may not be visible in one season or the other (when it passes near the Zenith during the daytime).
Where would you be if Sun passes through your zenith on Dec 21?
If the Sun passes through your zenith on December 21, you would be located near the Tropic of Capricorn in the Southern Hemisphere. This date marks the December solstice, when the Sun reaches its southernmost point in the sky, making it directly overhead at midday for locations within the tropics.
How many days will the sun pass through the zenith in a full year?
If you are located anywhere on earth that's more than 23.5 degrees from the equator, then the sun can never appear at your zenith. If you're anywhere within 23.5 degrees of the equator, then the sun will appear at your zenith, or very close to it, twice each year.
Do All stars pass through a zenith?
No, not all stars pass through the zenith. The zenith is the point directly overhead an observer, so stars that are close to the celestial pole (North or South) may not pass through the zenith at all from certain locations on Earth. Stars near the celestial equator are more likely to pass through the zenith as they appear to move across the sky.
How do you make a lunar zodiac sundial?
it is called a moondial. when the moon is at it's zenith it is called midnight, just as when the sun is at it's zenith is called midday.
Star with a declination of 10 degrees passes through your zenith?
If you are at a location with a latitude of 10 degrees north, a star with a declination of 10 degrees would be located directly overhead, at your zenith. This means the star is in the same plane as your latitude, making it the highest point in the sky relative to your position.
What is the imagenary point in the sky directly above an observer on Earth?
That's the observer's 'zenith'. Since it's referenced to the "observer's head", each observer has a different zenith.
What is the great circle passing through the south point on the horizon the zenith and the north point on the horizon is called?
The great circle passing through these points is called the meridian. It is an imaginary line that runs from the north celestial pole to the south celestial pole, passing through the zenith (overhead point) and intersecting the horizon at the north and south points.
The point in the sky which is directly overhead is called the?
its called the Zenith
Suppose you live at latitude 20N. Which star passes closest to your zenith on its daily path through your sky?
These all pass within 5 degrees of the zenith: Hamal (Alpha Arieties), Aldebaran (Alpha Tauri), Algieba (Gamma Leonis), Arcturus (Alpha Bootis), There are other fainter ones as well
