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Why must astronomers say that the sun rotates once evert 27 to 31 days?
Wiki User
∙ 13y ago
Since the sun isn't solid, there's no reason that all of it has to rotate at the same rate,
and in fact it doesn't. Different "latitudes" on the sun rotate at different Why_do_astronomers_say_that_the_sun_rotates_once_every_27_to_31_days_rather_than_give_an_exact_number. One belt
rotates every 27 days, another belt rotates every 31 days, and there are other belts
in between those that rotate at every rate in between 27 and 31 days. So there isn't
a single "exact number" for the sun, as there is for every solid body including the earth.
For any rate you want to name between 27 and 31 days, there's a part of the sun that
rotates exactly once in that period of time
Wiki User
∙ 13y ago
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Why do astronomers conclude that the crust on mars must be thicker than Earths crust?
: Why do astronomers conclude that the crust on Mars must be thicker then Earth's crust?
How many days in 1 year has Pluto?
90,580.0653 earth daysFirst you must break it down the same units of measure, because Pluto rotates around the sun every 248 (earth) years, and rotates on it's axis every 6.387 (earth) days. what we're going to do is put everything down to days. 248 (earth) years is about 90580.0653 (earth) days and since we already have Pluto's day at 6.387 (earth) days it just simple division if you want to know the amount of (Pluto) days in a (Pluto) year. 90580.0653/6.387 and you get your answer.There are roughly 14,181.9423 (Pluto) days in a (Pluto) year. Hope it helpsthere are 90,472 days in a year on pluto
Why do astronomers believe that globular clusters are made of old stars?
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When was the star spica discovered?
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The sidereal day of a planet is the time it takes to rotate once on it's axis. The solar day is the time from sunrise to sunset. To see why they are different, let's image a planet that rotates very slowly. Every time it goes around its star once, it also rotates once on its axis. Since it rotates once on its axis per year, there is one sidereal day per year. Now, in order for this to work, one side of the planet must be facing the star at all times. This means that there is no sunrise or sunset, so on this planet, there are zero solar days in a year. Now let's image a planet that rotates twice a year (has two sidereal days a year). At the beginning of the year, a side of that planet is facing the star. Halfway through that year, the planet has rotates once, but is on the other side of the star, so that side of the planet is now facing away from the star. At the end of the year, the planet is back where it started. There has been one sunrise and one sunset, so only one solar day. From this we can see that a planet (as long as it has at least one sidereal day per year) has one more sidereal day per year than solar day per year. There are 365.242 solar days in an Earth year, but there are 366.242 sidereal days in an Earth year.
What must astronomers do to view planets directly?
Astronomers use a telescope to view planets directly.
Why do astronomers conclude that the crust on mars must be thicker than Earths crust?
: Why do astronomers conclude that the crust on Mars must be thicker then Earth's crust?
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Does a 2004 Honda FR-V 1.7 vtec petrol have a timing belt or chain?
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How many days in 1 year has Pluto?
90,580.0653 earth daysFirst you must break it down the same units of measure, because Pluto rotates around the sun every 248 (earth) years, and rotates on it's axis every 6.387 (earth) days. what we're going to do is put everything down to days. 248 (earth) years is about 90580.0653 (earth) days and since we already have Pluto's day at 6.387 (earth) days it just simple division if you want to know the amount of (Pluto) days in a (Pluto) year. 90580.0653/6.387 and you get your answer.There are roughly 14,181.9423 (Pluto) days in a (Pluto) year. Hope it helpsthere are 90,472 days in a year on pluto
Why do astronomers move their telescopes when observing the sky?
To compensate for the motion of the Earth in order to observe a fixed object, such as a distant star. Relative to the Earth, distant objects do not move, but the Earth rotates and orbits the sun, thus all objects appear to move relative to a fixed point on the Earth. Therefore telescopes (which are fixed points) must move to compensate for this motion.
How astronomers study at the solar system?
Astronomers must learn physics, chemistry, mathematics and computer science...and how to use a telescope, astronomers must rely on their observation skills, for instance physics has helped astronomers to understand what makes spiral galaxies have spiral shapes, another is Spectroscopy which is the use of light from a distant object to work out the object is made of, When something is moving away from you, it stretches that waveform, while if it moves towards you it compresses the signal wavelength it emits. Spectroscopy also tells you a star's temperature, mass and surface gravity.
What two things must an astronomers find out in order to calculate a star's absolute brightness?
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How must astronomers dress in their job?
Clothing is generally required. Most observatories are on mountain tops, and are kept cold to prevent condensation from fogging the mirrors and lenses. Back in the days when astronomers had to actually LOOK through the telescopes, this meant that they generally dressed warmly. Nowadays, all the telescope sensors are electronic, and astronomers no longer live at their observatories. Everything except the physical maintenance is done remotely, via computer. So they can dress any way they like.
How many days do you have to be registered on howrse to take the level 2 quiz?
You must be have logged on for 10 days. You can't just be registered for 10 days, you must log for 10 days to have 10 days seniority.
How did astronomers know Neptune existed before they could see it?
Astronomers knew that Neptune existed before they could see it because they observed that the other planets orbited the sun in a way that could only be explained if they were being influenced by the gravity of another object of such mass. So the astronomers contemplated that there must be another planet somewhere that was changing the orbits of other planets. That planet is today called Neptune.
