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Sunrise [VERIFIED]

Commission meetings are typically conducted on the second and fourth Tuesday of each month in City Hall. Live and archived video of public meetings is available on Meetings are also rebroadcast on local Comcast Cable Channel 78.


Astronomically, sunrise occurs for only an instant: the moment at which the upper limb of the Sun appears tangent to the horizon.[1] However, the term sunrise commonly refers to periods of time both before and after this point:

The stage of sunrise known as false sunrise actually occurs before the Sun truly reaches the horizon because Earth's atmosphere refracts the Sun's image. At the horizon, the average amount of refraction is 34 arcminutes, though this amount varies based on atmospheric conditions.[1]

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.[1]

The timing of sunrise varies throughout the year and is also affected by the viewer's latitude and longitude, altitude, and time zone. These changes are driven by the axial tilt of Earth, daily rotation of the Earth, the planet's movement in its annual elliptical orbit around the Sun, and the Earth and Moon's paired revolutions around each other. The analemma can be used to make approximate predictions of the time of sunrise.

In late winter and spring, sunrise as seen from temperate latitudes occurs earlier each day, reaching its earliest time near the summer solstice; although the exact date varies by latitude. After this point, the time of sunrise gets later each day, reaching its latest sometime around the winter solstice. The offset between the dates of the solstice and the earliest or latest sunrise time is caused by the eccentricity of Earth's orbit and the tilt of its axis, and is described by the analemma, which can be used to predict the dates.

Variations in atmospheric refraction can alter the time of sunrise by changing its apparent position. Near the poles, the time-of-day variation is exaggerated, since the Sun crosses the horizon at a very shallow angle and thus rises more slowly.[1]

Accounting for atmospheric refraction and measuring from the leading edge slightly increases the average duration of day relative to night. The sunrise equation, however, which is used to derive the time of sunrise and sunset, uses the Sun's physical center for calculation, neglecting atmospheric refraction and the non-zero angle subtended by the solar disc.

Neglecting the effects of refraction and the Sun's non-zero size, whenever sunrise occurs, in temperate regions it is always in the northeast quadrant from the March equinox to the September equinox and in the southeast quadrant from the September equinox to the March equinox.[4] Sunrises occur approximately due east on the March and September equinoxes for all viewers on Earth.[5] Exact calculations of the azimuths of sunrise on other dates are complex, but they can be estimated with reasonable accuracy by using the analemma.

At sunrise and sunset, when the path through the atmosphere is longer, the blue and green components are removed almost completely, leaving the longer-wavelength orange and red hues seen at those times. The remaining reddened sunlight can then be scattered by cloud droplets and other relatively large particles to light up the horizon red and orange.[8] The removal of the shorter wavelengths of light is due to Rayleigh scattering by air molecules and particles much smaller than the wavelength of visible light (less than 50 nm in diameter).[9][10] The scattering by cloud droplets and other particles with diameters comparable to or larger than the sunlight's wavelengths (more than 600 nm) is due to Mie scattering and is not strongly wavelength-dependent. Mie scattering is responsible for the light scattered by clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light).[11][12][13]

Sunset colors are typically more brilliant than sunrise colors, because the evening air contains more particles than morning air.[7][8][10][13] Ash from volcanic eruptions, trapped within the troposphere, tends to mute sunset and sunrise colors, while volcanic ejecta that is instead lofted into the stratosphere (as thin clouds of tiny sulfuric acid droplets), can yield beautiful post-sunset colors called afterglows and pre-sunrise glows. A number of eruptions, including those of Mount Pinatubo in 1991 and Krakatoa in 1883, have produced sufficiently high stratospheric sulfuric acid clouds to yield remarkable sunset afterglows (and pre-sunrise glows) around the world. The high altitude clouds serve to reflect strongly reddened sunlight still striking the stratosphere after sunset, down to the surface.

A sunrise review explores whether there is a need to regulate a currently unregulated profession or occupation. COPRRR staff conduct a comprehensive study and then make recommendations to the Colorado General Assembly.

To create a regulatory requirement, the applicant or some other party must seek legislation, and they may do so regardless of the findings of the sunrise review. The General Assembly makes the final determination whether regulation should be imposed upon an occupation or profession.

Your Scenic Ocean View stateroom aboard Carnival Sunrise provides the best view of the sea that lies ahead of the ship, with views unlike any on land. And you'll get more of them, too, with floor-to-ceiling windows providing plenty of looking-glass for gazing at the natural wonders of the sea... and let's not forget sunrise and sunset.

But even park visitors not planning to hike or camp, should consider a trip to Sunrise, the highest point in the park you can drive to. The road leading to Sunrise ranks among the most beautiful drives in the country. En route be sure to pullover at Sunrise Point where you can feast on sweeping alpine views that include five volcanoes; Mount Rainier, Mount Baker, Glacier Peak, Mount Adams and Mount Hood in Oregon. And consider perhaps arriving at Sunrise Point in the wee hours of the morning for one of the finest sunrise showings to be seen anywhere in the nation! 041b061a72


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