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Topic: Hour angle

	MODULE 1 (Site not responding. Last check: 2007-10-22)
		This is explained (figure 1.1) as the angle between the line CH, where C is the centre of the earth, H is the location (or point) on the earth's surface and the projection of CH on the equatorial plane (AJBDA).
		The sun's rays are parallel to the meridian at V. The angle on the equatorial plane between the projection of the meridian of the location (the longitude passing through Q) and the projection of the meridian containing the sun's rays (longitude at V) gives the hour angle at that instant at Q.
		and the corresponding hour angles are denoted as sunrise hour angle (
	www.courses.ait.ac.th /ED06.22/course1/lecs/module1/m11o98.html (4013 words)

	hour angle
		hour angle, in astronomy, a coordinate in the
		The hour angle of a celestial body is the angular distance, expressed in hours, minutes, and seconds (one hour equals 15 degrees), measured westward along the celestial equator from the observer's celestial meridian to the
		is equal to the hour angle of the vernal equinox.
	www.factmonster.com /ce6/sci/A0824300.html (79 words)

	Coordinate Systems in Astronomy
		The hour angle or HA is the angle measured along the equator between the hour circle of the star and the observer's meridian (see figure 2).
		Hour angle is positive to the west, i.e.
		A star with an hour angle of 23 hours would be 1 hour before transit, and might be referred to as having an hour angle of -1 hour.
	www.astro.virginia.edu /~teacha/130_manual/node9.html (1059 words)

	Geometry Forum Project of the Month - Jan. 1996
		When the hour hand is at 12, it is 0 units from the origin, whereas when the hour hand is at 3, it is 15 units from the origin (recall that the hour hand moves 5 units every hour).
		Since each angle formed by the intersection of thte radii of consecutive minutes is 6 degrees and you are trying to discover the necessary number of minutes spaces between the hour hand and the minute hand to form the given angle, you divide the angle by 6 degrees.
		Because the angle is a central angle, the formula was stating the degree measure of the other "part of the 360 degree pie".
	mathforum.org /pom/sols1.96.html (10781 words)

	Geostationary Orbits Part 3: Pointing Angles
		Hour angle is the angle, in degrees, measured along the Celestial Equator, between two points: the point on the Celestial Equator nearest the satellite, and the peak point in the Celestial Equator.
		Hour Angle is analogous to azimuth in that both terms define the position of a satellite east or west of some specified reference point.
		Angles to objects north of the equator are positive; angles to objects south of the equator are negative.
	www.ctiinfo.com /SatControl/ComTrack/InclinedOrbitTutorial/satgeom3.htm (1090 words)

	Spherical Coordinates
		The right ascension of a star is the angle between the meridian of the vernal equinox and the meridian of the star measured eastward from from the vernal equinox 0 to 360 degrees, or in hours from 0 to 24 hours.
		The G.H.A. of a star is the angle between the meridian of Greenwich and the meridian of the star measured westward from from the Greenwich meridian 0 to 360 degrees.
		The Local hour angle is the angle between the celestial meridian of an observer and the hour circle of a celestial object.
	www.angelfire.com /nt/navtrig/E3.html (511 words)

	AllRefer.com - hour angle (Astronomy, General) - Encyclopedia
		hour angle, in astronomy, a coordinate in the equatorial coordinate system.
		The hour angle of a celestial body is the angular distance, expressed in hours, minutes, and seconds (one hour equals 15 degrees), measured westward along the celestial equator from the observer's celestial meridian to the hour circle of the object being located.
		The hour angle is used in measuring astronomical time; local sidereal time is equal to the hour angle of the vernal equinox.
	reference.allrefer.com /encyclopedia/H/hourangl.html (194 words)

	IAP Seminar: Celestial Navigation at Sea -- Notes & Outline
		Greenwich Hour Angle (GHA) is the East-West angle between the body's GP and the Greenwich meridian.
		Hour angle is always measured positive to the west.
		Hour angle can be expressed as time: 24 hours = 360 degrees, 4 minutes of time is 1 degree of angle.
	web.mit.edu /decouto/www/iap-nav/notes.html (3350 words)

	Solar Concepts
		The angle of the sun and its intensity on earth is affected by location of the place on the surface of the earth.
		Hour Angle = 15 * (12 - hour) where hour is the current hour of the day.
		The azimuth angle is the angle within the horizontal plane measured from true South or North.
	www.usc.edu /dept/architecture/mbs/tools/vrsolar/Help/solar_concepts.html (1743 words)

	Chapter 3
		As shown in Figure 3.3, the hour angle is the angular distance between the meridian of the observer and the meridian whose plane contains the sun.
		This angle is defined as the angle between the meridian parallel to sun rays and the meridian containing the observer.
		It is the angle, measured clockwise on the horizontal plane, from the north-pointing coordinate axis to the projection of the sun’s central ray.
	www.powerfromthesun.net /chapter3/Chapter3Word.htm (3578 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Basic Earth-Sun Angles The position of a point P on the earth's surface with respect to the sun's rays is known at any instant if the latitude, l, and hour angle, h, for the point, and the sun's declination angle, d, are known.
		The hour angle, h, is the angle measured in the earth's equatorial plane between the projection of EMBED Word.Picture.8 and the projection of a line from the center of the sun to the center of the earth.
		It is the angle between a line extending from the center of the sun to the center of the earth and the projection of this line upon the earth's equatorial plane.
	www.me.umn.edu /courses/me4131/LabManualWordFiles/DSolarRadiation.doc (1593 words)

	hour angle -- Encyclopædia Britannica
		in astronomy, the angle between an observer's meridian (a great circle passing over his head and through the celestial poles) and the hour circle (any other great circle passing through the poles) on which some celestial body lies.
		This angle, when expressed in hours and minutes, is the time elapsed since the celestial body's last transit of the observer's meridian.
		The hour circle that at any moment is passing through an observer's zenith is his meridian.
	www.britannica.com /eb/article-9041191?tocId=9041191 (849 words)

	Hour angle (Site not responding. Last check: 2007-10-22)
		Modeling is improved when each flight line is corrected for the hour angle of the sun at the time of flight.
		Change in sun angle is a variable that affects the incident light from the sun and therefore also affects the reflected light returning to the MS camera.
		The hour angle of the sun is calculated using data from the Astronomical Almanac for January 10, 1998, the day we flew our data.
	www.soest.hawaii.edu /GG/STUDENTS/ebitari/thesis/thesis3.html (108 words)

	[No title]
		The hour angle is zero when the object is on the meridian (due south, say) and changes...
		The solar declination changes during the day, the earth's orbit is elliptic and the relationship between uniformly increasing time and the change in the hour angle (the equation of time) is not constant during the day...
		Here's one: Let L be degrees lattitude (0 degrees at equator) R be the radius of Earth sphere B be the angle of the Earth's tilt (about 23 degrees isn't it?) a be the angle the line connecting the centre of the Sun with the centre of the Earth makes with the equatorial plane.
	www.math.niu.edu /~rusin/uses-math/position.sun/solar.position (1033 words)

	Solar Insolation
		The hour angle (H) is the angle that the earth has rotated since solar noon.
		At solar noon the hour angle = 0
		The Zenith Angle (Z) is the angle from the observers zenith point to the suns’ position in the sky.
	education.gsfc.nasa.gov /experimental/July61999siteupdate/inv99Project.Site/Pages/solar.insolation.html (797 words)

	HOUR ANGLE - Online Information article about HOUR ANGLE
		Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.
		ANGLE,' the angu:ar distance of a heavenly See also:
		It is equal to the angle at the pole between the hour circle through the body and the meridian, but is usually expressed in See also:
	encyclopedia.jrank.org /HOR_I25/HOUR_ANGLE.html (420 words)

	MSN Encarta - Dictionary - hour definition
		I have a couple of hours left to do in the yard.
		of the hour enjoying the highest degree of relevance, importance, or popularity at the current moment or a particular time
		The question of the hour is whether war is justified.
	encarta.msn.com /encnet/features/dictionary/DictionaryResults.aspx?refid=1861618940 (357 words)

	PSRCHIVE Library: Calibration::Parallactic class Reference (Site not responding. Last check: 2007-10-22)
		The correct usage of Parallactic Angle is in the context of the Equatorial and Ecliptic coordinate systems.
		The Hour Angle of an object is HA; zero on the meridian, negative to the east, and positive to the west.
		In the equatorial (RA,Dec) coordinate system the position angle of a directed vector on the sky is measured from equatorial North toward equatorial East; this is EquPA.
	astronomy.swin.edu.au /pulsar/software/libraries/psrchive/classCalibration_1_1Parallactic.html (307 words)

	hour. The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. (Site not responding. Last check: 2007-10-22)
		hours A set period of time for a specified activity: banking hours.
		The work that can be accomplished in an hour.
		The distance that can be traveled in an hour.
	www.bartleby.com /61/55/H0295500.html (203 words)

	Local Hour Angle (Site not responding. Last check: 2007-10-22)
		If the hour angle is 5 hours we know it is far to the west and will set in an hour.
		If the hour angle is 17h we expect it to rise in an hour.
		For example, if the sidereal time is 6h and the right ascension is 8h you know the object will cross your meridian in two hours (it will cross when the sidereal clock reads 8h) so right now the hour angle must be 22h or equivalently 2h east.
	www.physics.uq.edu.au /people/ross/phys2081/time/lha.htm (357 words)

	HOUR ANGLE - LoveToKnow Article on HOUR ANGLE
		HOUR ANGLE - LoveToKnow Article on HOUR ANGLE
		It is equal to the angle at the pole between the hour circle through the body and the meridian, but is usually expressed in time.
		To properly cite this HOUR ANGLE article in your work, copy the complete reference below:
	www.1911encyclopedia.org /H/HO/HOUR_ANGLE.htm (65 words)

	The Longines Lindbergh Hour Angle Limited Edition Watch was invented by Charles Lindbergh and available at Rich Company ... (Site not responding. Last check: 2007-10-22)
		The Longines EFC mark, and the Longines winged hour glass symbol are engraved on the back of the case along with the Limited Edition number.
		The Longines Hour Angle Watch which served as both a timepiece and an instrument for calculating longitude, was for its time an extremely elaborate device.
		If you wish more information about The Longines Hour Angle Limited Edition Watch, feel free to call our office during our West Coast business hours at the toll free numbers 800-443-6383, or you may e-mail at info@richcompany.com, and our staff will be pleased to assist you with your order.
	www.richcompany.com /limited-editions/lindbergh.htm (400 words)

	hour angle
		Microfibril angle variation in red pine (Pinus resinosa Ait.) and its relation to the strength and stiffness of early juvenile wood.
		Gann vs. geometric angles: angles drawn on price charts are similar to trendlines except that they are not drawn with the benefit of hindsight.
		Two approaches to such angles, geometric angles and Gann angles, are similar but they are not the same.
	www.infoplease.com /ce6/sci/A0824300.html (253 words)

	[No title]
		The angle measured westward ;;; from this meridian to the hour circle is called the hour angle (HA) of the ;;; star.
		The hour angle of the vernal equinox is defined as the local ;;; sidereal time of the observer; therefore, ;;; right ascension + hour angle = sidereal time.
		Since Lisp's standard function has a range of pi/2 to -pi/2, angles in quadrant 2 or 3 will be returned in quadrants 1 and 4.
	www.cs.cmu.edu /Groups/AI/lang/lisp/code/fun/sunset.cl (568 words)

	hour angle on Encyclopedia.com (Site not responding. Last check: 2007-10-22)
		Thirteen/WNET New York's WIDE ANGLE to Present White Smoke, an Unprecedented, Behind-the-Scenes Look at the Dramatic Process of Electing a New Pope.
		Laying the groundwork for fast bridge construction: prefabricated elements and systems accelerate construction of bridges to hours or days instead of months or years.
		Students demonstrate various angles in a fifth-grade math class at Amy Belle School in Colgate, Wisconsin, in June, 2003.
	www.encyclopedia.com /html/h1/hourangl.asp (632 words)

	How to Submit a Moon Observation
		It would be if there were 100 minutes in an hour, but there are only 60 minutes in an hour.
		The MHD box turns red if your calculated moon's hour angle is significantly different than the actual moon's hour angle at that date and time.
		The EHA box turns red if the elongation angle, based on your calculated moon's and sun's hour angle is incorrect.
	webusers.astro.umn.edu /~dkavars/teaching/general/moonsubmit.html (732 words)

	Arty Astro (Hour Angle) Method Sun (Site not responding. Last check: 2007-10-22)
		horizontal angle is equal to the tangent of the vertical
		angle of the observed body multiplied by the error in
		vertical angle were 1000 mils, the error in the
	www.tpub.com /content/USMC/mcr3161a/css/mcr3161a_190.htm (430 words)

	Arty Astro (Hour Angle) Method Sun Cont. (Site not responding. Last check: 2007-10-22)
		triangle that is necessary is the local hour angle.
		angle is determined by using the time of the
		Greenwich hour angle (GHA) is the amount of time
	www.tpub.com /content/USMC/mcr3161a/css/mcr3161a_191.htm (440 words)

	The Nautical Almanac (Site not responding. Last check: 2007-10-22)
		The main contents of the Almanac consist of data from which the Greenwich Hour Angle (G.H.A.) and the Declination (Dec.) of all the bodies used for navigation can be obtained for any instant of Greenwich Mean Time (G.M.T.).
		For the stars, the Sidereal Hour Angle, (S.H.A.) for each star is given, and the G.H.A. of the star is obtained from the Greenwich Hour Angle of Aries as follows:
		The G.H.A. of Aries, or the Greenwich Hour Angle of the first point of Aries (the Vernal Equinox), is tabulated for each hour of the year.
	www.angelfire.com /nt/navtrig/E6.html (331 words)

	[No title]
		;dec in degrees, RA in hours ;month is from 1.00 to 12.99, use decimals for days.
		object_vector = object_vector(ra_midnight - obj_ra) ; that's the hour* angle that the object is at at midnight, turned into ; a vector the same dimensions as time hour_angle = object_vector + time temp = where(hour_angle gt 12.) if temp[0] ge 0 then hour_angle(where(hour_angle gt 12.)) = $ hour_angle(where(hour_angle gt 12.)) - 24.
		;negative hour angle gives negative parallactic, as desired ;since the spherical angle is from N to E for HA>0 but N to W for HA temp = where(cos_parallactic lt 0.) if temp(0) ge 0 then $ ;i.e.
	www.astro.yale.edu /gawiser/observable.pro (1034 words)

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