A square degree (deg2) is a non-SI unit measure of solid angle. Other denotations include sq. deg. and (°)2. Just as degrees are used to measure parts of a circle, square degrees are used to measure parts of a sphere. Analogous to one degree being equal to π/180 radians, a square degree is equal to (π/180)2 steradians (sr), or about 1/3283 sr or about 3.046×10−4 sr.
The whole sphere has a solid angle of 4πsr which is approximately 41253 deg2:
A squaredegree (deg2) is a non-SI unit measure of solid angle. Other denotations include sq. deg. and (°)2. Just as degrees are used to measure parts...
{\displaystyle 4\pi } . Solid angles can also be measured in squares of angular measures such as degrees, minutes, and seconds. A small object nearby may subtend...
constellation of Phoenix. It was initially detected in 2010 during a 2,500 squaredegree survey of the southern sky using the Sunyaev–Zeldovich effect by the...
In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or π {\displaystyle \pi } /2 radians corresponding to a quarter turn. If...
Euclidean geometry, a square is a regular quadrilateral, which means that it has four sides of equal length and four equal angles (90-degree angles, π/2 radian...
used to make unprecedentedly deep high-resolution maps of hundreds of squaredegrees of the Southern sky. In 2017, the third-generation camera SPT-3G was...
\left({\tfrac {360^{\circ }}{2\pi }}\right)^{2}\approx } 3282.80635 squaredegrees. The solid angle of a cone whose cross-section subtends the angle 2θ...
The degree Celsius is the unit of temperature on the Celsius temperature scale (originally known as the centigrade scale outside Sweden), one of two temperature...
photometric observations taken with the SDSS imaging camera, covering 14,555 squaredegrees on the sky (just over 35% of the full sky). Data release 9 (DR9), released...
mathematics, a square root of a number x is a number y such that y 2 = x {\displaystyle y^{2}=x} ; in other words, a number y whose square (the result of...
dimensional lumber, and as a saw guide for short 45 and 90 degree cuts. The term "speed square" is a genericised trademark based on those owned by Swanson...
In recreational mathematics, a square array of numbers, usually positive integers, is called a magic square if the sums of the numbers in each row, each...
angular area viewed by the instrument, in squaredegrees, or for higher magnification instruments, in square arc-minutes. For reference the Wide Field...
Quarter Degree Grid Cells (or QDS - Quarter degreeSquares) are a way of dividing the longitude latitude degreesquare cells into smaller squares, forming...
bevelled. These set squares come in two usual forms, both right triangles: one with 90-45-45 degree angles, the other with 30-60-90 degree angles. Combining...
The Punnett square is a square diagram that is used to predict the genotypes of a particular cross or breeding experiment. It is named after Reginald C...
10-degree line of latitude north of the equator, hence the name. Ten Degree Channel is in the red square Andaman and Nicobar Islands map Ten Degrees Channel...
Dam Square or the Dam (Dutch pronunciation: [dɑm]) is a town square in Amsterdam, the capital and most populated city of the Netherlands. Its notable...
of 90 degrees (a right angle). Today the steel square is more commonly referred to as the framing square or carpenter's square, and such squares are no...
Decimal degrees (DD) is a notation for expressing latitude and longitude geographic coordinates as decimal fractions of a degree. DD are used in many geographic...
ranked by the solid angle that they subtend in the sky, measured in squaredegrees and millisteradians. These solid angles depend on arbitrary boundaries...
Trafalgar Square (/trəˈfælɡər/ trə-FAL-gər) is a public square in the City of Westminster, Central London, established in the early 19th century around...
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