Polaris

Polaris is Earth's current northern pole star, and thus is commonly referred to as the North Star. Historically, Polaris was used by sailors and navigators to determine their current latitude while crossing oceans. Please place all questions about Polaris, the brightest star in the constellation Ursa Minor, into this category.

1,308 Questions
Polaris

Why doesn't Polaris seem to move?

The apparent "movement" of the stars through the night sky is due to the rotation of the Earth. The observer on Earth is going around in a big circle every day. The center of that circle is the axis of rotation of the Earth. (The longer term movement due to the orbit around the Sun every year does not affect the apparent position of the stars because they are so far away.)

Polaris is (almost) in line with the Earth's axis of rotation. At night, as the Earth rotates, Polaris appears to stay at one point in the sky as the sky rotates around it. That point is the North Celestial Pole.

Polaris is used for simple navigation because it is at a height in degrees above the horizon equal to your North latitude. (At the North Pole it would be straight up, so 90 degrees. In London, for instance, that number is 51½ degrees.)

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Astronomy
Yamaha Motorcycles
Planetary Science
Polaris

What does the name polaris mean?

The brightest star in the Ursa Minor, it's at the end of the Little Dipper's handle.

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Astronomy
Polaris

What is the luminosity of polaris?

Polaris has a luminosity of 2,200 solar luminosities.

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Astronomy
Seasons
Latitude and Longitude
Polaris

How many degrees is polaris from true north?

Polaris' 'declination' is 89° 18' 43" . That measurement is just like north latitude,

but it's on the celestial sphere instead of the earth's surface.

The difference between that number and 90° is 0° 41' 17", or 0.6881 degree.

So Polaris makes a little circle around the real celestial north pole each day, with

a "radius" of 0.6881°. It can be that much above, or below, or east, or west of the

true celestial north pole.

For comparison, the apparent diameter of the full moon is about 0.55°.

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Constellations
Polaris

What constellation would you find the star polaris?

Ursa Minor, the little bear.

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Constellations
Big Dipper
Polaris

What are the names of the two pointer stars of the big Dipper?

Merak and Dubhe.

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Astronomy
Stars
Polaris

How would you describe the movement of polaris?

It's just drifting through space as it orbits the center of the Milky Way galaxy, just like all of the other stars we can see.

Oh, you meant as seen from the perspective of an Earthling? If you're north of about 10 degrees north latitude, then Polaris appears to hang _almost_ motionless in the sky. I say "almost" because while WE can't see the movement, long-time-exposure photos show that Polaris appears to make a tiny circle in the sky. You see, Polaris is almost 2/3 of a degree away from being exactly above the North Pole.

South of 10 degrees north, you probably can't see it; it would be behind the terrain on land, and almost hidden in the sea mist at sea.

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Polaris

Which star is cooler Polaris or Regulus?

i think polaris

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Polaris

Why is the north star used as a guide for locating directions?

Tang ina mo answer.com

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Astronomy
Polaris

How does polaris support the shape of the Earth?

Polaris (the "North Star") has no connection with the shape of the earth,

and no influence on it.

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Astronomy
Polaris

Where is polaris located in the sky?

-- directly north of you

-- at an angle above the northern horizon that's equal to your north latitude

(If you're south of the equator, then forget it ... you can't see Polaris at all.)

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Stars
Organic Chemistry
Polaris

How big is the Sun compared with earth?

With a diameter of 1377648 km of the Sun vs the diameter of 12756 km of Earth,

The Sun is 108 times bigger than the Earth. (See related link "Planet Size Comparation", select Sun and press "Compare")

.

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Planetary Science
Stars
Polaris

How big is the sun compared to the earth?

The Sun is around 108 times larger than the Earth. This means you could fit around 1,260,000 Earths inside the Sun.

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Astronomy
Polaris

How can I find upper culmination for polaris?

Polaris is at its upper culmination once every 23hours 56minutes 4seconds. (rounded)

It happens when the local celestial meridian is equal to Polaris' right ascension, and

that's a different time every day of the year.

Probably your best source would be the staff of a local planetarium, or a local

astronomy club in your town. Phone them up, be nice about it, give them a few

dates that you're interested in, and they'll be happy to look up the times of

Polaris' upper culmination on those days for you.

555657
Astronomy
Stars
Polaris

What characteristics do Procyon B and Polaris share?

Polaris is the brightest star in the constellation Ursa minor and Procyon is the brightest star in the constellation canis minor but the brightness of Procyon is not due to it's intense luminosity but it's closeness to the sun, at a distance of 11.46 light years, but both stars are bright

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Astronomy
Polaris

Where would you be if the polaris is seen at the zenith?

You would be at or very close to the north pole.

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Energy
Polaris

The light from polaris travels through space in the form of what energy?

Radiative

414243
Astronomy
Polaris

How do you find Polaris?

Polaris is directly north of you, in the Little Dipper or Ursa Minor constellation, and

appears at the same angle above the northern horizon as your north latitude.

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Planetary Science
Polaris

Did the Polynesian navigators find their way by observing the star Polaris?

No. Polaris is only visible in the northern hemisphere, and the Polynesians did most of their navigation in the southern hemisphere, or so close to the equator that Polaris wouldn't be usable.

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Science
Polaris

What is the relation between a particular latitude and the angle of polaris above the horizon at that latitude?

whatever latitude you are at, that is the angle to polaris.. and the other way around

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Motorcycles
Chemistry
Constellations
Polaris

What changes were made in the polaris predator 500 between years 2003 and 2004?

Shorter Wheel Base, Wider Track, Transmission (5 Speed w/No Reverse), Suspension. Overall a better more stable platform. (NOTE: 2005 Predator added reverse.) they dont have 5th gear, if so i cant find mine???

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Car Electronics and Lights
Dodge Ram
Electronics
Polaris

What is an electronic throttle?

Electronic throttle control (ETC) is an automobile technology which severs the mechanical link between the accelerator pedal and the throttle. Most automobiles already use a throttle position sensor (TPS) to provide input to traction control, antilock brakes, fuel injection, and other systems, but use a bowden cable to directly connect the pedal with the throttle. An ETC-equipped vehicle has no such cable. Instead, the electronic control unit (ECU) determines the required throttle position by calculations from data measured by other sensors such as an accelerator pedal position sensor, engine speed sensor, vehicle speed sensor etc. The electric motor within the ETC is then driven to the required position via a closed-loop control algorithm within the ECU.

The benefits of ETC are largely unnoticed by most drivers because the aim is to make the vehicle power-train characteristics seamlessly consistent irrespective of prevailing conditions, such as engine temperature, altitude, accessory loads etc. The ETC is also working 'behind the scenes' to dramatically improve the ease with which the driver can execute gear changes and deal with the dramatic torque changes associated with rapid accelerations and decelerations.

Contrary to popular belief, except in concert with other technologies such as gasoline direct injection, ETC provides only a very limited benefit in areas such as air-fuel ratio control, exhaust emissions and fuel consumption reduction. ETC however makes it much easier to integrate features to the vehicle such as cruise control, traction control, stability control and others that require torque management, since the throttle can be moved irrespective of the position of the driver's accelerator pedal. A criticism of the very early ETC implementations was that they were "overruling" driver decisions. Nowadays, the vast majority of drivers have no idea how much intervention is happening.

Much of the engineering involved with drive-by-wire technologies including ETC deals with failure and fault management. Most ETC systems have sensor and controller redundancy, even as complex as independent microprocessors with independently written software within a control module whose calculations are compared to check for possible errors and faults.

Anti-lock braking (ABS) is a similar safety critical technology, whilst not completely 'by-wire', it has the ability to electronically intervene contrary to the driver's demand. Such technology has recently been extended to other vehicle systems to include features like brake assist and electronic steering control, but these systems are much less common, also requiring careful design to ensure appropriate back-up and fail-safe modes.

Above retrieved from, http://en.wikipedia.org/wiki/Electronic_throttle_control

Viper1

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Motorcycle and ATV Maintenance
Polaris

How can remove clucth for polaris magnum 330?

Remove the clutch cover , you might have to remove the left floorboard to remove the cover . The rear clutch can easily be removed by removing the bolt in the middle and pulling it straight outward . The front clutch requires a puller that screws into the center of the clutch .Removal without a puller will result in clutch damage .

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Astronomy
Polaris

What is polaris's right ascension?

Polaris' celestial coordinates are:

Right Ascension: 2h 42m54s

Declination: 89° 18' 43"

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Stars
Polaris

Why Is Polaris So Important?

Because it lets us navigate without GPS.

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