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What is the line that passes from north to south through an observer's zenith called?
Wiki User
∙ 9y ago
Humans perceive in Euclidean space -> straight lines and planes. The circle that passes through the south point, north point and the point directly over.
Wiki User
∙ 9y ago
Wiki User
∙ 10y agoThat's your local celestial meridian.
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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.
Where would you be if Sun passes through your zenith on Dec 21?
Tropic of Capricorn
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).
What is the great circle passing through the south point on the horizon the zenith and the north point on the horizon is called?
A "meridian"
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.
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.
What is a meridian in the solar system?
I can not find any reference to a Meridian in the Solar System. In astronomy, there is the Earth's meridian. That's a "great circle" on the "celestial sphere". It passes through the "celestial poles" and also through the "zenith" at the observer's location.
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
The point in the sky which is directly overhead is called the?
its called the Zenith
Where will be the sun at noon?
When the Sun is at its highest position, it is at a line called the meridian. It is a line that goes from north to south, passing through the zenith.
An observer at a latitude of 79 Degrees North sees the Sun at the zenith at noon on which days?
An observer at latitude 79°, whether north or south, can never see the sun at his zenith. That's only possible for observers whose latitude is less than 23.5°, either north or south.
