Question: How many total degrees does the Space Needle rotate every 47 minutes?
About the article "Space Needle", section "Architecture".

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The architecture of the Space Needle is the result of a compromise between the designs of two men, Edward E. Carlson and John Graham, Jr.
The two leading ideas for the World Fair involved businessman Edward Carlson's sketch of a giant balloon tethered to the ground (see the gently sloping base) and architect John Graham's concept of a flying saucer (see the halo that houses the restaurant and observation deck).
Victor Steinbrueck introduced the hourglass profile of the tower.
The Space Needle was built to withstand wind speeds of 200 mph, double the requirements in the building code of 1962.
An earthquake registering 6.8 on the Richter Scale jolted the Needle enough in 2001 for water to slosh out of the toilets in the restrooms.
The Space Needle can endure serious structural damage during earthquakes of magnitudes below 9.
Also made to withstand Category 5 hurricane-force winds, the Space Needle sways only 1 inch per 10 mph (16 mm per 10 km/h) of wind speed.
For decades, the "hovering disk" of the Space Needle was home to two restaurants above the ground: the Space Needle Restaurant, which was originally named Eye of the Needle, and Emerald Suite.
These were closed in 2000 to make way for SkyCity, a larger restaurant that features Pacific Northwest cuisine.
It rotates 360 degrees in exactly forty-seven minutes.
In 1993, the elevators were replaced with new computerized versions.
The new elevators descend at a rate of .
On December 31, 1999 (New Year's Eve), a powerful beam of light was unveiled for the first time.
Called the Legacy Light or Skybeam, it is powered by lamps that total 85 million candela shining skyward from the top of the Space Needle to honor national holidays and special occasions in Seattle.
The concept of this beam was derived from the official 1962 World's Fair poster, which depicted such a light source although none was incorporated into the original design.
It is somewhat controversial because of the light pollution it creates.
Originally planned to be turned on 75 nights per year, it has generally been used fewer than a dozen times per year.
It did remain lit for eleven days in a row from September 11, 2001, to September 22, 2001, in response to the September 11, 2001 attacks.
The same 1962 World's Fair original poster showed a grand spiral entryway leading to the elevator, but this, too, was omitted from the final building plans.
This stairway was added as part of the Pavilion and Spacebase addition/remodel in June 2000.
The main stairwell (generally emergency access) has 848 steps in all from the basement to the top of the observation deck.
At approximately , the Space Needle was the tallest building west of the Mississippi River at the time it was built by Howard S. Wright Construction Co., but is now dwarfed by other structures along the Seattle skyline, among them the Columbia Center, at .
Unlike many other similar structures, such as the CN Tower in Toronto, the Space Needle is not used for broadcasting purposes.
[[Image:Kakeya needle.gif|right|thumb|Needle shown rotating inside a deltoid.
At every stage of its rotation, the needle is in contact with the deltoid at three points: two endpoints (blue) and one tangent point (black).
The needle's midpoint (red) describes a circle with diameter equal to half the length of the needle.|208px]]In mathematics, a Kakeya set, or Besicovitch set, is a set of points in Euclidean space which contains a unit line segment in every direction.
For instance, a disk of radius 1/2 in the Euclidean plane, or a ball of radius 1/2 in three-dimensional space, forms a Kakeya set.
Much of the research in this area has studied the problem of how small such sets can be.
Besicovitch showed that there are Besicovitch sets of measure zero.
A Kakeya needle set (sometimes also known as a Kakeya set) is a (Besicovitch) set in the plane with a stronger property, that a unit line segment can be rotated continuously through 180 degrees within it, returning to its original position with reversed orientation.
Again, the disk of radius 1/2 is an example of a Kakeya needle set.
Besicovitch showed that there are Kakeya needle sets of arbitrarily small positive measure. 
SkyCity, originally known as the "Eye of the Needle," is a revolving restaurant situated atop the Space Needle in Seattle, Washington.
It features a carousel (or ring-shaped) dining floor on which sit patrons' tables, chairs and dining booths.
The floor revolves on a track and wheel system, which weighs roughly 125 tons, at the rate of one revolution each 47 minutes.
The design of the rotating floor is so precise and balanced, that the rotation is accomplished using just a single 1½-horsepower motor.
SkyCity serves Pacific Northwest cuisine and features local seafood, steaks, chicken and vegetarian menu items.
The restaurant is considered fine dining, and has a casual dress code.
The seating has been arranged so that every table has an unobstructed view of the Seattle metropolitan area. 
Arguments for and against.
Pro-Needle Exchange Arguments.
Organizations ranging from the National Institutes of Health, the Centers for Disease Control, the American Bar Association, the American Medical Association, the American Psychological Association, the World Health Organization, and many others have endorsed low-threshold programs including needle exchange.
Needle exchanges help fight HIV/AIDS  Sterile needle and syringe access stand as one component of a wide range of HIV prevention strategies that include drug dependence treatment (pharmacotherapies and psychosocial interventions), outreach and education programs, counseling and testing, antiretroviral therapy, and treatment of sexually transmitted infections.
Many studies and review papers have shown that participation in multi-component HIV prevention programs that include NSE is associated with a reduction in drug-related HIV risk behaviors.
Evidence points towards the enhanced impact of harm reduction services when they work in combination.
Needle exchanges place harm reduction over punitive actions  The ethos of NEPs typically consists of support for the health and well-being of people who use drugs through awareness, education, and empowerment; for example, programs in Australia use the community development (CD) discipline as a basis for their work.
In accordance with the philosophy of harm reduction, NEPs treat illicit drug use as a health issue and neither condemn nor condone the practice.
Some U.S. states require a prescription to buy needles and syringes, as they are considered drug paraphernalia rather than medical equipment, and NEPs provide access in such areas.
No evidence of unintended consequences  "Few studies have specifically evaluated whether HIV prevention programs that include needle and syringe exchange lead to unintended consequences, such as increases in new drug users, more frequent injection among established users, expanded networks of high-risk users, more discarded needles in the community, and changes in crime trends.
Modest evidence shows that NSE does not increase the number of discarded needles in the community, and that injection frequency does not increase among NSE participants.
Weak evidence and limited data suggest that programs that include NSEs do not lead to new users, expanded drug networks, or increases in crime."
Needle exchanges benefit their areas of implementation  Most NSPs operate on a one-for-one basis, and in so doing reduce the presence of discarded needles in the area; they provide safe disposal for discarded needles.
Needle exchanges help bring addicts into treatment programs  Injection drug users (IDUs) are at risk of a wide range of health problems arising from non-sterile injecting practices, complications of the drug itself or of the lifestyle associated with drug use and dependence.
Furthermore, unrelated health problems, such as diabetes, may be neglected because of drug dependence.
However, despite their increased health care needs, IDUs do not have the required access to care or may be reluctant to use conventional services.
Consequently, their health may deteriorate to a point at which emergency treatment is required, with considerable costs to both the IDUs and the health system.
Accordingly harm reduction based health care centers, also known as "targeted health care outlet" or "low-threshold health care outlet" for IDUs have been established across a range of settings utilising a variety of models.
NSP staff facilitate a connection between people who use drugs and medical facilities, thereby exposing them to voluntary physical, psychological, and emotional treatment programs.
Social services for addicts can be centered around needle exchanges.
Needle exchanges are cost effective  As of 2011, the Centers for Disease Control and Prevention estimate that every HIV infection prevented through a needle exchange program saves an estimated US$178,000+, as well as an overall estimate whereby a reduction of 30 percent or more HIV cases is reported among people who inject drugs.
As of March 2012, an estimated 1.2 million people were living with HIV in the United States, with one in five people unaware of their HIV-positive status—of those 1.2 million people infected, 25 percent resulted from injecting drug use, which is the fastest growing population of HIV.
For the same time period, over 50,000 new cases of HIV are estimated to occur each year.
NEPs represent a significant saving in public healthcare costs.
For example, it is estimated that the average annual cost of HIV care per person in the United States is US$15,745.
Those with advanced HIV had an annual estimated cost of US$40,678.
Depending on when infection is detected and when the treatment process begins, it is estimated that, as of November 2006, the total lifetime healthcare costs of HIV care are between US$303,000 and $619,000.
In the U.S., the cost per needle at a NEP is approximately US$0.97, whereas the estimated cost of one day’s worth of the HIV treatment medication Truvada is US$36.
Needle exchanges have reached a certain degree of public acceptance  Although needle exchange is a controversial subject in the United States, needle exchange programs—supported by private, state, and local funding—have proliferated.
Internationally, there is much broader acceptance of the needle exchange model and its well-documented efficacy.
Needle exchanges have achieved varying degrees of acceptance by churches and other religious groups as expressed in official resolutions from organizations such as the House of Bishops of the Episcopal Church, the Central Conference of American Rabbis, the Presbyterian Church, and the Society of Christian Ethics.  
A philosophy of harm reduction promotes information and resources for IV drug users.
General guidelines on safer injecting of various substances intravenously are typically based on the following steps:The area for drug preparation should be cleaned with warm soapy water or an alcohol swab to minimize the risk of bacterial infection.
The equipment required involves new syringes and needles, alcoholic swabs, rinse eye drops as sterile water, filter (cotton or syringe filter like Sterifilt), tourniquet and a clean spoon or Stericup.
In order to minimize the chance of bacteria or viruses entering the bloodstream, people are advised to wash their hands with soap and warm water.
However, as people do not always have access to hot water and soap when they are injecting, the philosophy of harm reduction seeks to find the most realistic and reliable option that drug users will take: a process that takes much time or access to materiel is unlikely to be used frequently.
Alcohol swabs are commonly distributed with injecting equipment, and while they are less effective than hand washing, their use is more effective than nothing.
Any sharing of injecting equipment, even tourniquets, is highly discouraged, due to the high danger of transmitting bacteria and viruses via the equipment.
Sterile water is also recommended to prevent infection.
Many needle and syringe programs distribute vials or ampoules of USP sterile water for this reason.
Where sterile water is not obtainable, the harm reduction approach recommends tap water boiled for five minutes, and then allowed to cool.
Once the water and substance are combined in the mixing vessel, heat is sometimes applied to assist the mixing.
Filtering is recommended by health services, as the mix can consist of wax or other non-soluble materials which are damaging to veins.
Additionally, the injection of talc has been associated with pulmonary talcosis in intravenous drug users.
Wheel filters are the most effective filters.
5.0 micron wheel filter (e.g.
Apothicom Sterifilt), now shared in some needle-exchange programmes instead of cotton, is intended to get rid of the talc from prescription tablets like benzodiazepines, dextroamphetamine, methadone tablets, and other recreational drugs like MDMA.
However cotton wool (with the risk of cotton fever) or tampons can be used, although to be more effective, several filtrations should be performed; cigarette filters should not be used due to the risk of fibres breaking off and being injected along with the solution, nor should filters of any sort ever be re-used, either as filters or in an attempt to recover drug material present, due to many risks, ranging from cotton fever to life-threatening sepsis.
Once the mix is drawn into the syringe, air bubbles should be removed by flicking the barrel with the needle pointed upwards and pressing the plunger to expel the bubbles that pool at the top.
This is done to prevent injection of air into the bloodstream.
The potential danger of an air embolism is often greatly overestimated by IV users; up to three CCs of air can be injected intravenously without causing complications, and time spent meticulously getting every minute air bubble out of the syringe would often be better spent ensuring clean conditions in general.
A tourniquet can be used to assist vein access.
The tourniquet should not be on too tight, or left on for too long, as this causes the veins to swell and stretch.
When injecting, the needle's bevel or 'hole' should face upward and be eased into the vein at a shallow angle between 10 and 35 degrees to minimize the risk of penetrating through the vein entirely.
In order to prevent stress on the vein, the needle should be pointing towards the heart.
The plunger should be pulled back slightly (colloquially known as 'jacking back' or 'flagging') to ensure the needle is in the vein.
Blood should appear in the barrel of the syringe if this is the case.
This process is termed aspirating the needle or registering.
When accessing a vein with unobstructed blood flow a "flashback," or sudden flash of red blood inside the needle tip, may occur spontaneously when the needle enters the vein.
Because sudden appearance of blood in the needle/syringe alone does not guarantee proper needle placement (flashbacks can also occur when a needle passes through a vein completely, enters an artery inadvertently, or otherwise is extravasated), aspirating the plunger on the syringe is still considered a requisite step.
The tourniquet should then be taken off and the plunger gently pushed.
After injection, a clean tissue or cotton wool should be pressed against the injection site to prevent bleeding.
Although many people use an alcohol swab for this purpose it is discouraged by health services as the alcohol interferes with blood clotting.
Dispose of injecting gear using a 'sharps bin' if supplied.
Other rigid-walled containers such as a bottle are recommended as a second best option.