**Angle**

Sunrise occurs before the Sun actually reaches the horizon because the Sun's image is refracted by the Earth's atmosphere. The average amount of refraction is 34 arcminutes, though this amount varies based on atmospheric conditions.

Also, unlike most other solar measurements, sunrise occurs when the Sun's *upper limb*, rather than its center, appears to cross the horizon. The apparent radius of the Sun at the horizon is 16 arcminutes.

These two angles combine to define sunrise to occur when the Sun's center is 50 arcminutes below the horizon, or 90.83° from the zenith.

Read more about this topic: Sunrise, Measurement

### Other articles related to "angle, angles":

... and thinnest it is concave, and extends from the medial

**angle**to the base of the coracoid process ... downward and backward to the inferior

**angle**... the three, and extends from the medial to the inferior

**angle**...

... allowing the transmission of an image through a right

**angle**without inverting it (that is, without changing the image's handedness) as an ordinary right-

**angle**prism or mirror ... internal reflection, since the beams are incident at an

**angle**less than the critical

**angle**(the minimum

**angle**for total internal reflection) ... is not used optically but truncates what would otherwise be an awkward

**angle**joining the two mirrored faces ...

**Angle**s in Geography and Astronomy

... This system specifies the latitude and longitude of any location in terms of

**angles**subtended at the centre of the Earth, using the equator and (usually) the Greenwich ... The

**angle**between those lines can be measured, and is the angular separation between the two stars ... One could say, "The Moon's diameter subtends an

**angle**of half a degree." The small-

**angle**formula can be used to convert such an angular measurement into a ...

**Angle**s

... There are 3

**angles**The superior

**angle**is covered by trapezius ... The inferior

**angle**is covered by latissimus dorsi ... The lateral or glenoid

**angle**is broad and bears the glenoid cavity or fossa, which is directed forward, laterally and slightly upwards ...

### Famous quotes containing the word angle:

“From whichever *angle* one looks at it, the application of racial theories remains a striking proof of the lowered demands of public opinion upon the purity of critical judgment.”

—Johan Huizinga (1872–1945)

“Modesty is the only sure bait when you *angle* for praise.”

—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)

“The good lawyer is not the man who has an eye to every side and *angle* of contingency, and qualifies all his qualifications, but who throws himself on your part so heartily, that he can get you out of a scrape.”

—Ralph Waldo Emerson (1803–1882)