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Topic: Solar day

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Metric time

Sidereal day

Leap second

Sol

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Time and date and astronomy on Mars

	[No title]
		The solar corona material is massive in size (they can occupy up to a quarter of the solar limb), and frequently accompanied by the remnants of an eruptive prominence, and less often by a strong solar flare.
		Note also that data from Ulysses during solar minimum have shown that the solar wind from the Sun's poles has a higher speed than the speed in the ecliptic, so then the heliopause should be further from the Sun in the polar direction.
		The earlier spots in the solar cycle appear at higher latitudes and the later spots in the solar cycle emerge nearer to the equator.
	solar-center.stanford.edu /gloss.html (2722 words)

	Day - Wikipedia, the free encyclopedia
		A day, as opposed to night, is commonly defined as the period during which sunlight directly reaches the ground, assuming that there are no local obstacles.
		In astronomy, the sidereal day is also used; it is about 3 minutes 56 seconds shorter than the solar day, and close to the actual rotation period of the Earth, as opposed to the Sun's apparent motion.
		Days such as Christmas Eve, Hallowe'en, and the Eve of Saint Agnes are the remnants of the older pattern when holidays began the evening before.
	en.wikipedia.org /wiki/Day (1264 words)

	Solar time -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-06)
		Solar time can be measured by a (Timepiece that indicates the daylight hours by the shadow that the gnomon casts on a calibrated dial) sundial.
		Mean solar time is artificial (A timepiece that shows the time of day) clock time adjusted via observations of the (Click link for more info and facts about diurnal rotation) diurnal rotation of the fixed stars to agree with average apparent solar time.
		Before the mid first millennium BC they were only adjusted to agree with the apparent solar day, thus were no better than the shadow cast by a (Indicator provided by the stationary arm whose shadow indicates the time on the sundial) gnomon (a vertical pole), except that they could be used at night.
	www.absoluteastronomy.com /encyclopedia/s/so/solar_time.htm (593 words)

	Solar time - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-11-06)
		Second, due to Earth's axial tilt, the Sun does not move along Earth's celestial equator but usually moves at an angle to it during the year, thus it moves fast or slow depending on whether it is moving toward or away from the equator (see Tropical year).
		Consequently, apparent solar days are shorter in March and September than they are in June or December.
		An apparent solar day may differ from a mean solar day by as much as 30 seconds, but because many of these large or small days occur in succession, the difference builds up to as much as 17 minutes.
	encyclopedia.learnthis.info /s/so/solar_time.html (595 words)

	Highbeam Encyclopedia - Search Results for solar
		The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary observer's celestial meridian.
		A study of solar radiation daylight illuminance and sky luminance data measurements for Hong Kong.
		Solar water heating up: a wide range of options exist for ready-to-install, readily certified solar water heating systems.
	www.encyclopedia.com /SearchResults.aspx?Q=solar&StartAt=41 (1444 words)

	Solar time Information
		Apparent solar time is based on the apparent solar day, which is the interval between two successive returns of the Sun to the local meridian.
		An apparent solar day may differ from a mean solar day (of 86,400 seconds) by as much as nearly 22 seconds shorter to nearly 29 seconds longer.
		Before the middle of the first millennium BC, the water clocks were only adjusted to agree with the apparent solar day, thus were no better than the shadow cast by a gnomon (a vertical pole), except that they could be used at night.
	www.bookrags.com /Solar_time (679 words)

	On-Line Glossary of Solar Terrestrial Terms
		Solar flares that occur repetitively in the same ACTIVE REGION, with essentially the same position and with a common pattern of development.
		Of the white-light CORONA (that is, the corona seen by the eye at a total solar eclipse), that portion which is caused by sunlight scattered by electrons in the hot outer atmosphere of the sun.
		In the SOLAR WIND, the area of demarcation between sec- tors, which are large-scale features distinguished by the predominant direction of the interplanetary magnetic field, toward or away from the sun.
	sec.noaa.gov /info/glossary.html (3637 words)

	Reference.com/Encyclopedia/Sun
		The solar constant is equal to approximately 1,370 watts per square meter of area at a distance of one AU from the Sun (that is, on or near Earth).
		Solar activity minima tend to be correlated with colder temperatures, and longer than average solar cycles tend to be correlated with hotter temperatures.
		Partial solar eclipses are hazardous to view because the eye's pupil is not adapted to the unusually high visual contrast: the pupil dilates according to the total amount of light in the field of view, not by the brightest object in the field.
	www.reference.com /browse/wiki/Sol (6809 words)

	Sidereal day and solar day@Everything2.com
		A solar day is the time it takes for a planet to make precisely one revolution, relative to the Sun (or whatever star it is orbiting).
		It is no coincidence that 8 is the number of solar days in the year, and 1/8 is the factor by which the solar day differs from the sidereal day.
		Earthlings most easily recognise the solar day because the sun is so significant in the sky; it lights up the whole sky by atmospheric scattering and obscures all the other stars, so the solar day is the most significant type of day on Earth.
	www.everything2.com /index.pl?node_id=1166432 (772 words)

	Definition of Solar day
		Consequently, apparent solar days are shorter in March (26–27) and September (12–13) than they are in June (18–19) or December (20–21).
		An apparent solar day may differ from a mean solar day (of 86,400 s) by as much as nearly 22 s shorter to nearly 29 s longer.
		Before the mid first millennium BC they were only adjusted to agree with the apparent solar day, thus were no better than the shadow cast by a gnomon (a vertical pole), except that they could be used at night.
	www.wordiq.com /definition/Solar_day (645 words)

	day
		The simplest definition of a day's duration, and the one used in most sciences, including astronomy, is that it is 86,400 seconds as the second is defined in SI.
		The sidereal day is subdivided in the same way as the solar day, into 24 sidereal hours; each sidereal hour into 60 sidereal minutes, and each sidereal minute into 60 sidereal seconds.
		Because the vernal equinox itself moves (due to the precession of the Earth's axis), the sidereal day is not quite the same as the period of earth's rotation with respect to a fixed direction in space.
	www.sizes.com /time/day.htm (1160 words)

	Astronomy Without a Telescope
		This makes the length of time for one solar day to be a little more than the true rotation rate of 23 hours 56 minutes with respect to the background stars.
		Four minutes later or one degree of further rotation aligns the arrow and Sun and you have one solar day (24 hours) since the last time the Sun was on the meridian.
		If you are a careful observer, you will notice that the solar day is sometimes slightly longer than 24 hours and sometimes slightly shorter than 24 hours during the year.
	www.astronomynotes.com /nakedeye/s7.htm (1155 words)

	Solar time - InfoSearchPoint.com (Site not responding. Last check: 2007-11-06)
		The length of a solar day varies throughout the year.
		The length of a mean solar day is a constant 24 hours throughout the year although, as noted above, the amount of daylight varies.
		The difference between apparent solar time and mean solar time, which is sometimes as great as 15 minutes, is called the equation of time.
	www.infosearchpoint.com /display/Solar_time (249 words)

	Solar e-Clips - Solar-powered gizmos and gadgets rule at Earth Day Festival [Solar Schoolhouse Olympics - Imperial ...
		The solar ovens are convenient for camping in areas where cooking with fire is prohibited, he said.
		Solar radios are available but costly they said, and a homemade device works just as well.
		The Solar Schoolhouse, a kindergarten-through-12th-grade solar education program, sponsored competitions for area high school students in solar water fountain and solar home design, solar cooking and solar car races.
	www.californiasolarcenter.org /solareclips/2005.05/20050502-3.html (1068 words)

	SignOnSanDiego.com > News > State -- Solar energy's day is dawning
		The California Solar Initiative commits the state to spending more than $3.4 billion over the next 10 years to subsidize the installation of 1 million solar roofs, or about 3,000 megawatts of electricity capacity, enough at peak output to match six modern natural-gas-fired power plants.
		The Legislature broadened the solar subsidy program to municipal utilities – which aren't regulated by the PUC – and raised the cap on the amount of power that local utilities must buy from the owners of solar electric systems.
		Solar produces the greatest amount of electricity on sunny days, frequently when the price of electricity is highest because of peak demand for air conditioning.
	www.signonsandiego.com /news/state/20061210-9999-1n10solarone.html (2203 words)

	day — FactMonster.com
		However, because of the tilt of the earth's axis of rotation, the times of sunrise and sunset vary from day to day, with the result that in the Northern Hemisphere there are long days and short nights in the summer and short days and long nights in the winter.
		Days - Days A day is measured by how long it takes the earth to rotate (turn) once: 24 hours.
		Dorothy Day - Dorothy Day social activist, journalist, and cofounder of the Catholic Worker movement Born: 1897...
	www.factmonster.com /ce6/sci/A0814837.html (310 words)

	solar day - OneLook Dictionary Search
		Solar Day : Technology Terms and Acronyms [home, info]
		Solar Day : Eric Weisstein's World of Astronomy [home, info]
		Phrases that include solar day: mean solar day, true solar day
	www.onelook.com /?lang=all&w=solar+day (185 words)

	Sidereal Time (Site not responding. Last check: 2007-11-06)
		A solar day lasts from when the Sun is on the meridian at a point on Earth until it is next on the meridian.
		Because of the Earth's revolution, a solar day is slightly longer than a sidereal day.
		A sidereal day lasts from when a distant star is on the meridian at a point on Earth until it is next on the meridian.
	astrosun2.astro.cornell.edu /academics/courses/astro201/sidereal.htm (276 words)

	guerrilla solar - hack a day - www.hackaday.com _ (Site not responding. Last check: 2007-11-06)
		I doubt that one or two solar panels are going to spin your meter backwards, unless you live in the worlds smallest house and use only an electric shaver and small toaster with your electrical service.
		If you measure the energy needed to construct a solar panel (only including the energy once the materials have reached the factory) and the total energy that it is expected to produce over its lifetime, the net energy is negative.
		Solar cells have a useful purpose, powering the grid is not one of them.
	www.hackaday.com /entry/1234000680030047 (2489 words)

	Physikalisch-Technische Bundesanstalt (PTB)
		Due to the obliquity of the ecliptic and the elliptical shape of the earth's orbit, the duration of the true solar day (the interval between two successive meridian transits of the sun at the same place) is not at all constant.
		The definition of the duration of the second as the 86400th part of the mean solar day basically was arbitrary, and part of our tradition.
		The comparison between the earth's rotation and the orbits of planets and of the moon showed that the duration of the mean solar day is changing continuously.
	www.ptb.de /en/org/4/44/441/info1_e.htm (912 words)

	154 day solar periodicity [Oulu] (Site not responding. Last check: 2007-11-06)
		The 154 day periodicity in the Sun was first reported on gamma-ray flares (Rieger et al., 1984).
		solar wind/IMF, although it does not seem to be a persistent periodicity, and the exact period varies between 140 and 170 days.
		Lean, J. L., Evolution of the 155 day periodicity in the sunspot areas during solar cycles 12 to 22, Astrophys.
	www.oulu.fi /~spaceweb/textbook/t154d.html (215 words)

	Mean Solar Day
		However the length of the apparent solar day is not constant throughout the year because of two contributing factors.
		To account for these varitions the solar day is averaged so all the days of the year will be of equal length.
		The apparent solar day may only gain or loose as much as 20 seconds per day, but the difference adds up because the effects are cumulative.
	nfo.edu /solarday.htm (393 words)

	The day the solar wind ran out of gas
		It is kept in its place by the pressure of the solar wind, which spins off the sun as it rotates, travelling at a rate of 1.6 million — 3 million kilometres per hour as it approaches the magnetosphere.
		But seven months ago, the solar wind density (the number of electrons and protons per cubic centimetre) was down by 98 per cent.
		While the speed and density of the solar wind became normal the day after, the density of the high-energy electrons in the magnetosphere plummeted again on May 13, and remained significantly depleted for weeks.
	www.exn.ca /Templates/Story.asp?ID=1999121356 (552 words)

	time, sequential arrangement of all events: Physical Time and Its Measurement — FactMonster.com
		In prehistory, humans recognized the alternation of day and night, the phases of the moon, and the succession of the seasons; from these cycles, they developed the day, month, and year as the corresponding units of time.
		Hence the eastward motion of the sun against the stars is not uniform and the length of the true solar day varies seasonally, but on the average is four minutes longer than the sidereal day.
		Therefore the mean solar day, with a length equal to the annual average of the actual solar day, was introduced as the basis of mean solar time.
	www.factmonster.com /ce6/sci/A0861557.html (507 words)

	Second
		The hour had previously been defined by the ancient Egyptians in terms of the rotation of the Earth (indirectly, of course, as they were unaware that the earth rotated) as 1/24 of a solar day.
		In 1956 the second was defined in terms of the period of revolution of the Earth around the Sun for a particular epoch, because by then it had become recognized that the Earth's rotation on its own axis was not sufficiently uniform as a standard of time.
		With the development of the atomic clock, it was decided to use atomic clocks as the basis of the definition of the second, rather than the rotation of the earth.
	www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http://articles.gourt.com/%22http%3A%2F%2Farticles.gourt.com%2F%3Farticle%3Dsecond (762 words)

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