How did astronomers know that the sun rotates?

How did astronomers know that the sun rotates?
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Answer :

The easiest way to see this is by observing sunspots.The Doppler effect can also be used - i.e., checking the Doppler effect from the radiation of individual parts of the Sun's surface.
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The sun rises in Arunachal Pradesh two hours before it does in Dwaraka in Gujarat. This is because the former is (a) higher in elevation than Dwaraka (b) situated further north than Dwaraka (c) situated further east (about 30º longitude) than Dwaraka (d) situated about 30 º east of Dwaraka and the earth rotates from west to east

Description : The sun rises in Arunachal Pradesh two hours before it does in Dwaraka in Gujarat. This is because the former is (a) higher in elevation than Dwaraka (b) situated further north than Dwaraka (c) situated ... than Dwaraka (d) situated about 30 º east of Dwaraka and the earth rotates from west to east

Last Answer : Ans: (d)

The pole star does not seem to move because (a) it is in line with the earth’s axis of rotation (b) it moves around the sun and not the earth (c) its movement can be seen only during a solar eclipse (d) it rotates very rapidly

Description : The pole star does not seem to move because (a) it is in line with the earth’s axis of rotation (b) it moves around the sun and not the earth (c) its movement can be seen only during a solar eclipse (d) it rotates very rapidly

Last Answer : Ans:(a)

Constellations appear to change their positions at different times of night because (a) the earth revolves round the sun (b) the earth rotates about its axis (c) the constellations move faster than the earth (d) the earth and the constellations move in opposite directions

Description : Constellations appear to change their positions at different times of night because (a) the earth revolves round the sun (b) the earth rotates about its axis (c) the constellations move faster than the earth (d) the earth and the constellations move in opposite directions

Last Answer : Ans:(b)

We always see the same lace of the moon, because – (1) It is smaller than the earth (2) It revolves on its axis in a direction opposite to that of the earth (3) It takes equal time for revolution around the earth and rotation on its own axis (4) It rotates at the same speed as the earth around the sun

Description : We always see the same lace of the moon, because - (1) It is smaller than the earth (2) It revolves on its axis in a direction opposite to that of the earth (3) It takes equal time for revolution ... the earth and rotation on its own axis (4) It rotates at the same speed as the earth around the sun

Last Answer : (3) It takes equal time for revolution around the earth and rotation on its own axis Explanation: It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side ... to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.

The term ‘equinox’ means – (1) The path which the Earth takes around the Sun (2) The axis of the Earth around which it rotates (3) When the day and night are of equal duration (4) The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

Description : The term ‘equinox’ means – (1) The path which the Earth takes around the Sun (2) The axis of the Earth around which it rotates (3) When the day and night are of equal duration (4) The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

Last Answer : (3) When the day and night are of equal duration Explanation: The name "equinox" is derived from the Latin aequus (equal) and nox (night), because around the equinox, the night and day have ... The term equinox can also be used in a broader sense, meaning the date when such a passage happens.

We always see the same lace of the moon, because – (1) It is smaller than the earth (2) It revolves on its axis in a direction opposite to that of the earth (3) It takes equal time for revolution around the earth and rotation on its own axis (4) It rotates at the same speed as the earth around the sun

Description : We always see the same lace of the moon, because - (1) It is smaller than the earth (2) It revolves on its axis in a direction opposite to that of the earth (3) It takes equal time for revolution ... the earth and rotation on its own axis (4) It rotates at the same speed as the earth around the sun

Last Answer : (3) It takes equal time for revolution around the earth and rotation on its own axis Explanation: It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side ... to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.

We always see the same face of the moon, because (1) it is smaller than the earth (2) it revolves on its axis in a direction opposite to that of the earth (3) it takes equal time for revolution around the earth and rotation on its own axis (4) it rotates at the same speed as the earth around the sun

Description : We always see the same face of the moon, because (1) it is smaller than the earth (2) it revolves on its axis in a direction opposite to that of the earth (3) it takes equal time for revolution around the earth and rotation on its own axis (4) it rotates at the same speed as the earth around the sun

Last Answer : it takes equal time for revolution around the earth and rotation on its own axis

The term ‘equinox’ means (1) The path which the Earth takes around the Sun (2) The axis of the Earth around which it rotates (3) When the day and night are of equal duration (4) The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

Description : The term ‘equinox’ means (1) The path which the Earth takes around the Sun (2) The axis of the Earth around which it rotates (3) When the day and night are of equal duration (4) The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

Last Answer : When the day and night are of equal duration

How come it appears when astronomers talk of life on other planets they seem to use Earth as the only template?

Description : How come it appears when astronomers talk of life on other planets they seem to use Earth as the only template?

Last Answer : answer: What makes astronomers believe life out there has to adhere to the perimeters of here, being Earth? Nothing. In fact, many people have hypothesized just that. However, we ... asphalt. The study of these extremophiles may inform the search for extraterrestrial microorganisms, as well.

Do astronomers have to memorize every point of light in the sky?

Description : Do astronomers have to memorize every point of light in the sky?

Last Answer : No. There are too many. I’m not an astronomer, but Hubby is. I have read some articles in his magazines that mention them by numbers or some such. Maybe those are only known by their locations in the sky. . But they do know the locations and names of many as well.

How many dwarf planets have astronomers discovered ?

Description : How many dwarf planets have astronomers discovered ?

Last Answer : Astronomers have discovered 5 dwarf planets.

Why do astronomers have to move their telescopes when observing thr stars?

Description : Why do astronomers have to move their telescopes when observing thr stars?

Last Answer : Need answer

Why do astronomers think there is not great amount of mass in the halo of the milky way?

Description : Why do astronomers think there is not great amount of mass in the halo of the milky way?

Last Answer : Need answer

Why do astronomers conclude that none of the Jovian planets rings can be left over from the formation of the planets?

Description : Why do astronomers conclude that none of the Jovian planets rings can be left over from the formation of the planets?

Last Answer : I understand that they have calculated that such a ring wouldnot be stable in the long term. It might last a few hundred millionyears, at most, if I remember correctly.

What group in Egyptian society served as astronomers?

Description : What group in Egyptian society served as astronomers?

Last Answer : Need answer

What wavelengths can astronomers detect from earth?

Description : What wavelengths can astronomers detect from earth?

Last Answer : Only those which aren't absorbed too much by the atmosphere.Those are visible light, and radio waves.

What do you think when astronomers mean when they use the term observable universe?

Description : What do you think when astronomers mean when they use the term observable universe?

Last Answer : It means that anything beyond a certain distance (currentlyabout 46 billion light-years away) can't be observed by us, evenwith the best instruments, because any signal (light, gravitationalwaves, etc. ... larger than theobservable Universe. It may or may not be infinite; we don'tcurrently know.

What planet did astronomers predict its existence by observing the effects of gravity?

Description : What planet did astronomers predict its existence by observing the effects of gravity?

Last Answer : Neptune was predicted by astronomers be observing the effects ofits gravity. Neptune was discovered in 1846 by Johann GottfriedGalle.

Is it true that in the late 1500s Ptolemy's observations were supplanted by those of later Greek astronomers?

Description : Is it true that in the late 1500s Ptolemy's observations were supplanted by those of later Greek astronomers?

Last Answer : Later polish astronomers

What are some famous astronomer's?

Description : What are some famous astronomer's?

Last Answer : People who made important contributions to our knowledge ofAstronomy include Kepler, Galileo, Bruno (Giordano Bruno),Einstein, Lemaitre, Zwicky, Hubble... And a host of others. You canfind many more names, for instance, if you check the Wikipediaarticle on "History of astronomy".

What tools do Astronomers use to gather evidence in support of the Big Bang Theory?

Description : What tools do Astronomers use to gather evidence in support of the Big Bang Theory?

Last Answer : Feel Free to Answer

Why do astronomers use frequencies when investigating the universe?

Description : Why do astronomers use frequencies when investigating the universe?

Last Answer : It is because stars and other cosmic objects, radiate energyacross the whole of the electromagnetic spectrum.

What evidence do astronomers have that there is dark matter in the universe?

Description : What evidence do astronomers have that there is dark matter in the universe?

Last Answer : What is the answer ?

Why do astronomer's believe they can learn about early earth by studying comets?

Description : Why do astronomer's believe they can learn about early earth by studying comets?

Last Answer : Because comets were created about the same time as theEarth.

Why do astronomers use frequencies when investigating the universe?

Description : Why do astronomers use frequencies when investigating the universe?

Last Answer : It is because stars and other cosmic objects, radiate energyacross the whole of the electromagnetic spectrum.

Is astronomers a common noun?

Description : Is astronomers a common noun?

Last Answer : Yes, the noun 'astronomer' is a common noun, a general word for someone who studies the universe and the objects in it.

Can radio astronomers collect data only after dark?

Description : Can radio astronomers collect data only after dark?

Last Answer : No, they can collect data during the day, as well.

How many constellations are recognized by astronomers today?

Description : How many constellations are recognized by astronomers today?

Last Answer : There are 88 constellations recognized by astronomers right now.

Why do astronomers find it difficult to locate extrasolar planets with telescope?

Description : Why do astronomers find it difficult to locate extrasolar planets with telescope?

Last Answer : light from the they orbit makes it difficult to locate extrasolar planets with telescope

Why do astronomers find it difficult to locate extrasolar planets with telescope?

Description : Why do astronomers find it difficult to locate extrasolar planets with telescope?

Last Answer : light from the they orbit makes it difficult to locate extrasolar planets with telescope

SN 1054 is a supernova that was first observed in 1054 AD by Chinese, Arab and Japanese astronomers. It was visible in ordinary light for 23 days and for around two years in the night-sky. What is its famous remnant that has a pulsar at its centre and expands at the rate of 1500 km per second?

Description : SN 1054 is a supernova that was first observed in 1054 AD by Chinese, Arab and Japanese astronomers. It was visible in ordinary light for 23 days and for around two years in the night-sky. What is its famous remnant that has a pulsar at its centre and expands at the rate of 1500 km per second?

Last Answer : Crab Nebula.

6. The Theory of Panspermia is still a favourite idea for some astronomers which states that a) Life could have come from pre-existing Life b) Life started from chemicals c) Units of life called spores were transferred to different planets d) Life came out of decaying & rotting matter

Description : 6. The Theory of Panspermia is still a favourite idea for some astronomers which states that a) Life could have come from pre-existing Life b) Life started from chemicals c) Units of life called spores were transferred to different planets d) Life came out of decaying & rotting matter

Last Answer : c) Units of life called spores were transferred to different planets

What's that Sony Ericsson that rotates to open?

Description : What's that Sony Ericsson that rotates to open?

Last Answer : http://www.amazon.com/Sony-Ericsson-Unlocked-Bluetooth-Warranty/dp/B00284AMUE

A grinding wheel rotates at 3000 rpm. When power supply is cut off the wheel stops in 5 sec. The number of revolutions made by the wheel before coming to rest would be a.500 b.107 dynes c.250 d.3000 e.1000

Description : A grinding wheel rotates at 3000 rpm. When power supply is cut off the wheel stops in 5 sec. The number of revolutions made by the wheel before coming to rest would be a.500 b.107 dynes c.250 d.3000 e.1000

Last Answer : c. 250

The resultant of a force acting on a body will be zero, if the body a.Rotates with uniform acceleration b.Moves along a curved path c.Rotates d.Does not rotate e.Rotates with uniform deceleration

Description : The resultant of a force acting on a body will be zero, if the body a.Rotates with uniform acceleration b.Moves along a curved path c.Rotates d.Does not rotate e.Rotates with uniform deceleration

Last Answer : d. Does not rotate

A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s? a.3 b.107 dynes c.5 d.6 e.7

Description : A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s? a.3 b.107 dynes c.5 d.6 e.7

Last Answer : a. 3

A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be a.1500 b.3000 c.1000 d.250 e.500

Description : A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be a.1500 b.3000 c.1000 d.250 e.500

Last Answer : d. 250

The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is a.8.88 m/sec b.16.32 m/sec c.5.88 m/sec d.8.16 m/sec e.Zero

Description : The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is a.8.88 m/sec b.16.32 m/sec c.5.88 m/sec d.8.16 m/sec e.Zero

Last Answer : e. Zero

an automotive engine's camshaft rotates at -General Knowledge

Description : an automotive engine's camshaft rotates at -General Knowledge

Last Answer : An automotive engine's camshaft rotates at one-half the speed of the crankshaft.

A rigid square plate ABCD of unit side rotates in its own plane about the middle-point of CD until the new position of A coincides with -Maths 9th

Description : A rigid square plate ABCD of unit side rotates in its own plane about the middle-point of CD until the new position of A coincides with -Maths 9th

Last Answer : answer:

The Earth rotates-around an axis pointing towards which side? -Do You Know?

Description : The Earth rotates-around an axis pointing towards which side? -Do You Know?

Last Answer : answer:

Which is the only planet that rotates in its east to west direction on its axis? -General Knowledge

Description : Which is the only planet that rotates in its east to west direction on its axis? -General Knowledge

Last Answer : answer:

If the Earth rotates on its own axis at a speed of 30 kilometers per second, then why does the Earth look fixed from space ?

Description : If the Earth rotates on its own axis at a speed of 30 kilometers per second, then why does the Earth look fixed from space ?

Last Answer : Earth in its own orbit 29.8km / sec. Keeps moving fast. But when viewed from space, the earth looks fixed. The reason is 29.8km / sec. The speed seems too much to us but it is negligible to the ... earth is 12,667km. . So even if the earth rotates at that speed, it seems to be apparent from space.

A disc of radius R rotates with constant angular velocity `omega` about its own axis. Surface charge density of this disc varies as `sigma = alphar^(2

Description : A disc of radius R rotates with constant angular velocity `omega` about its own axis. Surface charge density of this disc varies as `sigma = alphar^(2

Last Answer : A disc of radius R rotates with constant angular velocity `omega` about its own axis. Surface charge density of ... D. `(mu_(0)alphaomegaR^(3))/(3)`

What planet rotates backwards compared to earth?

Description : What planet rotates backwards compared to earth?

Last Answer : I think venus

What rotates in a counterclockwise direction around an eye?

Description : What rotates in a counterclockwise direction around an eye?

Last Answer : Feel Free to Answer

If the spider rotates 144 degrees at each step how many degrees does she rotate to create the star?

Description : If the spider rotates 144 degrees at each step how many degrees does she rotate to create the star?

Last Answer : What is the answer ?

What planet rotates backward compared to earth?

Description : What planet rotates backward compared to earth?

Last Answer : I think venus

How many revolutions will a turntable that rotates through an angle of 3 over 2 pi in one second make in 60 seconds?

Description : How many revolutions will a turntable that rotates through an angle of 3 over 2 pi in one second make in 60 seconds?

Last Answer : I guess you mean 3 pi over 2, ie 3Ï€/2 though it may have been given to you as (3/2)Ï€ To solve this, find the total angle turned in 60 seconds and divide by the angle in a whole ... radians = 90Ï€/2Ï€ revolutions = 45 revolutions (45 rpm - the figure calculated - was the standard for a single).

The Presidency of the United Nations Security Council rotates (in alphabetical order) among its members every: A. 06 months B. 03 months C. 02 months D. 01 month

Description : The Presidency of the United Nations Security Council rotates (in alphabetical order) among its members every: A. 06 months B. 03 months C. 02 months D. 01 month

Last Answer : ANSWER: D