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Coordinates used in the equatorial coordinate system
celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the zenith) and the hour circle (containing
Hour_angle
Celestial coordinate system used to specify the positions of celestial objects
to the hour circle passing through the object. Unlike right ascension, hour angle is always increasing with the rotation of Earth. Hour angle may be considered
Equatorial_coordinate_system
Azimuth angle of the Sun's position
and 180 degrees when the hour angle, h, is negative (morning) and the angle between 180 and 360 degrees when the hour angle, h, is positive (afternoon)
Solar_azimuth_angle
Equation to derive time of sunset and sunrise
H_{0}=-\tan \phi \,\tan \delta } where: H 0 {\displaystyle H_{0}} is the solar hour angle at either sunrise (when the negative value is taken) or sunset (when the
Sunrise_equation
Angle between the zenith and the centre of the Sun's disc
{\displaystyle \alpha _{s}=90^{\circ }-\theta _{s}} h {\displaystyle h} is the hour angle, in the local solar time. δ {\displaystyle \delta } is the current declination
Solar_zenith_angle
Horizontal angle from north or other reference cardinal direction
and hour angle at a specific location, modify the formula for a spherical Earth. Replace φ2 with declination and longitude difference with hour angle, and
Azimuth
Time-telling device
official noon. This correction can easily be made by rotating the hour-lines by a constant angle equal to the difference in longitudes, which makes this a commonly
Sundial
Figure formed by two rays meeting at a common point
In geometry, an angle is formed by two lines that meet at a point. Each line is called a side of the angle, and the point they share is called the vertex
Angle
Measurement of electromagnetic radiation
average of Q over a day is the average of Q over one rotation, or the hour angle progressing from h = π to h = −π: Q ¯ day = − 1 2 π ∫ π − π Q d h {\displaystyle
Solar_irradiance
Spherical triangle used in astronavigation
By measuring the angle of the celestial body in the sky, the observer can get the local hour angle (LHA) of X, which is the angle subtended at P between
Navigational_triangle
Daily falling of the Sun below the horizon
Calculate the sunset hour angle using the sunset equation; Calculate the sunset time, which is the solar noon time plus the sunset hour angle in degree divided
Sunset
Calculation of elapsed time by the apparent position of the sun
thousands of years. Mean solar time is the hour angle of the mean position of the Sun, plus 12 hours. This 12 hour offset comes from the decision to make
Solar_time
Part of celestial coordinate system
an hour circle at any time. The hour circle is a subtype whereby it is expressed in hours as opposed to degrees, radians, or other units of angle. The
Hour_circle
Unit of time equal to 60 minutes
horsepower-hour (hph), a measure of energy used in the railroad industry hour angle, a measure of the angle between the meridian plane and the hour circle
Hour
astronomy, the parallactic angle is the angle between the great circle through a celestial object and the zenith, and the hour circle of the object. It
Parallactic_angle
Time of day when the sun appears above the horizon
the sunrise hour angle using the sunrise equation; Calculate the sunrise time, which is the solar noon time minus the sunrise hour angle in degree divided
Sunrise
positions of navigational stars — expressed as declination and sidereal hour angle — are often rounded to the nearest degree. In addition to tables, star
List_of_stars_for_navigation
Astronomical equivalent of longitude
to 24h. It is important not to confuse sidereal hour angle with the astronomical concept of hour angle, which measures the angular distance of an object
Right_ascension
Apparent solar time minus mean solar time
Apparent solar time can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar
Equation_of_time
Navigational method
sight must be known so that the celestial position i.e. the Greenwich Hour Angle (Celestial Longitude - measured in a westerly direction from Greenwich)
Longitude_by_chronometer
System for specifying positions of celestial objects
altitude Equatorial coordinates α, right ascension δ, declination h, hour angle Ecliptic coordinates λ, ecliptic longitude β, ecliptic latitude Galactic
Astronomical coordinate systems
Astronomical_coordinate_systems
Swiss watchmaker
In 1931, Longines collaborated with Charles Lindbergh to introduce the Hour Angle aviation watch. In 1934, Longines released the first Chronograph with
Longines
American wrestler (born 1968)
Kurt Steven Angle (born December 9, 1968) is an American retired professional wrestler and former amateur wrestler. He is currently a sports analyst for
Kurt_Angle
Astronomical navigation technique
azimuth Zn must be computed. The local hour angle, LHA, is the difference between the AP longitude and the hour angle of the observed object. It is always measured
Intercept_method
Topics referred to by the same term
systems design and implementation with a view to maximising service Hour angle, in astronomy, one of the coordinates of the equatorial coordinate system
Ha
Topics referred to by the same term
Look up hour in Wiktionary, the free dictionary. An hour is a unit of measurement of time. (The) Hour(s) may also refer to: Hour angle, the measurement
Hour_(disambiguation)
12 o'clock in the daytime
train and plane schedules.) Afternoon Analemma Dipleidoscope Hour angle Solar azimuth angle The 29th edition of the U.S. GPO Government Printing Office
Noon
Timekeeping system on Earth relative to the celestial sphere
Retrieved 30 April 2025. Urban & Seidelmann 2013, "Glossary" s.v. hour angle, hour circle, sidereal time. Urban & Seidelmann 2013, p. 78. IERS 2013. Bartlett
Sidereal_time
American aviator (1902–1974)
easier for pilots. First produced in 1931, they called it the "Lindbergh Hour Angle watch", and it remains in production today. In 1929, Lindbergh became
Charles_Lindbergh
Great semicircle passing through the celestial poles
sidereal time can be used to determine the time of its culmination (see hour angle). The term meridian comes from the Latin meridies, which means both "midday"
Meridian_(astronomy)
Mathematical question
measurements: angles and time. The angle is typically measured in degrees from the mark of number 12 clockwise. The time is usually based on a 12-hour clock.
Clock_angle_problem
Publication on celestial body positions
Almanac specifies for each whole hour of the year the position on the Earth's surface (in declination and Greenwich hour angle) at which the Sun, Moon, planets
Nautical_almanac
Period of twilight in the morning or evening
the blue hour Praia da Ursa, Cabo da Roca, Portugal. A wide-angle view of the seascape during the blue hour Zug, Switzerland during the blue hour Padmanabhaswami
Blue_hour
Arc-like path that the Sun appears to follow across the sky
components to calculate the solar zenith angle and solar azimuth angle. The calculated solar vector at 1-hour step for a full year for both daytime and
Sun_path
the hour-lines on the horizontal surface are uniformly drawn. The angle between successive hour-lines is constant. The hour-lines for successive hours are
Bifilar_sundial
Topics referred to by the same term
presented in the 2007 book What Is Intelligence? by James R. Flynn Sidereal hour angle, in astronomy Intel SHA extensions Measure of material hardness using
Sha
Timing of Islamic prayers
to 0.833°, where h is the elevation in meters (see Sunrise equation § Hour angle). Maghrib prayer is called for when the sun is completely folded behind
Salah_times
Pendulum whose period is precisely two seconds
solar time (clock time). Mean solar time is the hour angle of the mean Sun plus 12 hours. This 12 hour offset comes from the decision to make each day
Seconds_pendulum
British jazz trumpeter and composer
Eacott's work Hour Angle works in a similar way to Floodtide, yet its notation is generated by calculating the movement of the sun. Hour Angle performances
John_Eacott
Unit of plane angle where a full circle equals 360°
usually denoted by ° (the degree symbol), is a unit of measurement of a plane angle in which one full rotation is assigned the value of 360 degrees. The unit
Degree_(angle)
Tool for finding true north through the positions of astronomical bodies
according to the local latitude. The sights are then set using the local hour angle and the declination of whatever astronomical body is being used. Once
Astrocompass
Conceptual tool in astronomy
Astronomy portal Horizontal coordinate system Equatorial coordinate system Hour angle Pole star Polar alignment Equatorial mount Equinox (celestial coordinates)
Celestial_sphere
ascension, the hour angle is one of many ways commonly used to specify the longitudinal position of an object upon the celestial sphere. hour circle Any imaginary
Glossary_of_astronomy
DL represents the hour/angle (polar angle)Holwell, John (1712). Clavis Horologiae. when the shadow passes under the style. AV- Angle to vertical? -this
Schema for vertical declining dials
Schema_for_vertical_declining_dials
longitude is now added or subtracted to the Greenwich Hour Angle of the object to obtain the local hour angle, that is the difference in longitude between the
Ex-meridian
First and last hour of sunlight during the day
appears more reddish. In addition, the sun's low angle above the horizon produces longer shadows. The term hour is used figuratively; the effect has no clearly
Golden_hour_(photography)
Relative direction using a dial
between 12 and the LOS. On a 24-hour watch, the sun and the hour hand advance at the same rate. There is no need to half the angle. The zenith LOS is only an
Clock_position
Real line of position in celestial navigation
(+E/-W). LHA = GHA + L is the local hour angle (+W/-E), Dec and GHA are the declination and Greenwich hour angle of the star observed. And Ho is the true
Circle_of_equal_altitude
Celestial navigational algorithm
GHA} , the Greenwich hour angle of the body observed; L H A = G H A + L o n {\displaystyle LHA=GHA+Lon} , the local hour angle of the body observed.
Sight_reduction
Natural number
sides that is not able to be constructed with a straightedge, compass, and angle trisector. The Mathieu group M 11 {\displaystyle \mathrm {M} _{11}} is the
11_(number)
Angle between the two sightlines or two objects as viewed from an observer
measure of the angle between the orientation of two straight lines, rays, or vectors – typically in three-dimensional space – or the central angle subtended
Angular_distance
Topics referred to by the same term
classification symbol: Landing helicopter assault (LHA) LHA, the local hour angle of an astronomical object Lha Charitable Trust, an Indian nonprofit organization
LHA
Topics referred to by the same term
Homes Alliance, UK Green Hills Academy, in Kathmandu, Nepal Greenwich hour angle Noumérat – Moufdi Zakaria Airport, serving Ghardaïa, Algeria, IATA code
GHA
2016 studio album by Toothgrinder
2016; "Blue" on April 20; and "Coeur D'Alene" on June 22. The songs "The Hour Angle," "Dejection / Despondency," and "Schizophrenic Jubilee" were re-recorded
Nocturnal_Masquerade
Method of orienting telescopes and other celestial observation devices
Φ {\displaystyle \Phi } is site latitude, h {\displaystyle h} is the hour angle of the reference point equals ( α {\displaystyle \alpha } − local sidereal
Polar_alignment
Computer that calculates aiming for weapons
used an integral compass, but was updated by calculation (azimuth by hour angle or azimuth by Polaris) or 'carried' by survey techniques from a survey
Director_(military)
Astronomical location
elements format with fractional day: 00001.50000000 Sidereal time is the hour angle of the equinox. However, there are two types: if the mean equinox is used
Equinox (celestial coordinates)
Equinox_(celestial_coordinates)
Naming system for time on Earth
hour is equivalent to 15 NET degrees. NET is equivalent to the UTC read from a 24-hour analog clock as the clockwise angle past midnight of the hour hand
New_Earth_Time
Surveying instrument that uses the Sun's direction instead of magnetism
declination angles are additive. The angle of the Sun due to time of day is set on the hour angle arc, which is perpendicular to the polar axis. This angle is
Burt's_solar_compass
Apparent angular position of any star in the sky; point on the celestial sphere
the north celestial pole to −90° at the south), α is usually given in hour angles (0 to 24 h). This is due to the observation technique of star transits
Star_position
Solar radiation reaching the Earth's surface
solar declination, Φ is the latitude, β is an angle from the horizontal and h is the solar hour angle. Rd is given by: R d = 1 + cos ( β ) 2 {\displaystyle
Diffuse_sky_radiation
Sign rising over the Eastern Horizon
a right ascension 6h higher than that of the meridian (or 90º more in hour angle), the equation that determines East Point's longitude can be written as:
Equatorial_ascendant
Study of the surface and shape of the Moon
crater was then subdivided evenly into 24 parts, like a 24-hour clock. Each "hour" angle, running clockwise, was assigned a letter, beginning with "A"
Selenography
Scientific interpretation of tidal forces
=(\theta _{M}+\pi -s)} is mean Lunar time, the Greenwich hour angle of the mean Moon plus 12 hours. β 2 = s = ( F + Ω ) {\displaystyle \beta _{2}=s=(F+\Omega
Theory_of_tides
1983 novel by Greg Egan
An Unusual Angle (1983) was the debut novel by Australian science fiction writer Greg Egan by Norstrilia Press. The novel follows a high school boy who
An_Unusual_Angle
the angle Z is its azimuth. The equation of the isoazimuthal curve for a star with coordinates (Dec, GHA), - Declination and Greenwich hour angle -, observed
Isoazimuth
Arab astronomer and clockmaker (1304–1375)
a moveable hole in it which allowed the user to find the hour angle of the sun. If this angle was suitable with the horizon, then the user could use it
Ibn_al-Shatir
instruments such as the *croniogoniómetro*, used for determining the hour angle and position of celestial bodies at sea. He was active in the international
João_Carlos_de_Brito_Capelo
Objects that appear to be close in the sky
means that they merely have the same right ascension (and hence the same hour angle). This is called conjunction in right ascension. However, there is also
Conjunction_(astronomy)
American-bred Thoroughbred racehorse
the weeks before the Wood; an abscess was found under his lip hours before the race. Angle Light, a true speed horse who never won a race without an early
Angle_Light
Method for calculating average values
and statistics, a circular mean or angular mean is a mean designed for angles and similar cyclic quantities, such as times of day, and fractional parts
Circular_mean
Ephemerides of the celestial bodies used in navigation. GHA - Greenwich Hour Angle Dec - Declination SD - Semidiameter HP - Horizontal Parallax s the solution
Navigational_algorithms
Sanskrit astronomical text (c. 932 CE)
Mañjula's formula for evection, and improves his formula for calculating the hour-angle from the day-length 'Karanottama of Achyuta (died 1621) of Kerala; adopts
Laghumānasa
Radiation scattering technique
Small-angle X-ray scattering (SAXS) is a small-angle scattering technique by which nanoscale density differences in a sample can be quantified. This means
Small-angle_X-ray_scattering
Astronomer in Ta'izz, Yemen
Ta'izz at latitude 13° 37' and obliquity 23° 35', including tables of the hour angle and the time since sunrise. It also contains tables of the solar altitude
Abu_al-'Uqul
Brown dwarf in the constellation Hydra
diamond shapes are their positions entered according to right ascension in hours angle (indicated at the edge of the map's reference disc), and according to
WISE_0855−0714
Polymath (1020–1101)
with the power-drive The Inner Nest polar-mounted declination ring or hour-angle circle, with sighting tube attached to it and strengthened by a diametral
Su_Song
2008 book by Malcolm Gladwell
decision-making. Throughout the book, Gladwell repeatedly mentions the "10,000-Hour Rule", claiming that the key to achieving world-class expertise in any skill
Outliers_(book)
Units for measuring angles
small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying, and marksmanship. To express even smaller angles, standard
Minute_and_second_of_arc
Human male external reproductive organ
erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. As of 2015[update], the average erect human
Human_penis
Shape of the Moon's sunlit portion as viewed from Earth
as third or final quarter), when the Moon's ecliptic longitude is at an angle to the Sun (as viewed from the center of the Earth) of 0°, 90°, 180°, and
Lunar_phase
UNESCO World Heritage Site in Jaipur
observer to move inside the instrument; measures altitudes, azimuths, hour angles, and declinations) Kapali Yantra (measures coordinates of celestial bodies
Jantar_Mantar,_Jaipur
Movable mount for satellite dishes
astronomical equatorial mounts in that they point at objects at fixed hour angles that follow the astronomical right ascension axis. Like equatorial mounts
Polar_mount
2002 American TV series or program
The weekly one-hour program covered international current affairs and was last hosted by veteran journalist Aaron Brown. Wide Angle began broadcasting
Wide_Angle_(TV_program)
American chef and television personality
competition show. She was a co-host on The Chew, a one-hour talk show centered on food from all angles, which premiered on ABC in September 2011. Hall was
Carla_Hall
Japanese subsidiary of the Citizen Group
beat rate of 28,800 BPH (= 4 Hz), 51° lift angle, 24 jewels and features (automatic) winding, a ≥42 hours power reserve, manual winding and a hack function
Miyota (watch movement manufacturer)
Miyota_(watch_movement_manufacturer)
Steel dive roller coaster
(180 ft) drop at an 87.5-degree angle into an underground tunnel, where riders reach a top speed of 109.4 kilometres per hour (68 mph) and experience 4.5
Oblivion_(roller_coaster)
Imaginary point directly above a particular location, on the imaginary celestial sphere
location 12 hours from solar noon. In astronomy, the altitude in the horizontal coordinate system and the zenith angle are complementary angles, with the
Zenith
Angle. This episode was updated and rebroadcast on July 31, 2003. This episode was updated and rebroadcast on September 2, 2004. This is a two-hour episode
List_of_Wide_Angle_episodes
SI unit of energy
τ is (the vector magnitude of) torque, and θ is the angle swept (in radians). Since plane angles are dimensionless, it follows that torque and energy
Joule
American actor and wrestler (born 1972)
continued to feud with Angle over the WWF Championship, culminating at No Way Out on February 25, 2001, where he pinned Angle to win the WWF Championship
Dwayne_Johnson
Film by Anthony Maras
average rating of 7.6/10. The website's consensus reads: "Finding a fresh angle on one of the most dramatized days in military history, Pressure is a brainy
Pressure_(2026_film)
World record-setting British hydroplane
miles per hour (160 km/h) to the water speed record, taking it from existing mark of 178 miles per hour (286 km/h) to just over 276 miles per hour (444 km/h)
Bluebird_K7
Indian radio astronomer
parallel to the axis of the earth. The design made it possible to track the hour angle of celestial radio sources for 9.5 hrs. ORT has been used for a number
Govind_Swarup
Lunar day in the Hindu calendar
approximately from 19 to 26 hours. Every day of a lunar month is called tithi. A tithi is defined as the time taken for the longitudinal angle between the Sun and
Tithi
Piston engine with six cylinders in a "V" configuration
remaining vibrations. A 60-degree V-angle results in a narrower engine overall than V6 engines with larger V-angles. This angle often results in the overall
V6_engine
Reference for aircraft maneuvering
equipped with 4-minute turn indicators. The formula for calculating the angle of bank for a specific true airspeed (TAS) in SI units (or other coherent
Standard_rate_turn
location on the globe is a direct effect of Sun angle on climate, as the solar zenith angle (the angle of incidence at which sunlight strikes Earth) varies
Effect of Sun angle on climate
Effect_of_Sun_angle_on_climate
Circle on the celestial sphere parallel to the horizon
Wayback Machine (in Japanese) Adelaide Observatory: Almucantar graphs of hour angles, Adelaide, R. E. E. Rogers, Govt. printer, 1927. Chandler, Seth Carlo
Almucantar
Astronomical treatise written by Nilakantha Somayaji
The important angles are the angle at the zenith which is the Sun's azimuth and the angle at the north pole which is the Sun's hour angle. The problem
Tantrasamgraha
HOUR ANGLE
HOUR ANGLE
Boy/Male
Biblical
My hour or time.
Girl/Female
Hindu, Indian, Marathi, Punjabi, Sikh
Hour; Time of Day
Biblical
your bonds; your chains
Girl/Female
Indian
Hoor of heaven, A Houri, Virgin of paradise
Biblical
my hour or time
Boy/Male
Biblical
My hour or time.
Male
Egyptian
, the son of Pnei-hor.
Girl/Female
Biblical Egyptian Muslim
An hour, eye, fountain.
Biblical
my time; my hour
Boy/Male
Biblical
Your bonds, your chains.
Boy/Male
Biblical
My time, my hour.
Girl/Female
Muslim
Hoor of heaven, A Houri, Virgin of paradise
Girl/Female
Native American
Sour.
Biblical
the hour of God
Boy/Male
Biblical
The hour of God.
Girl/Female
Muslim
Hoor of heaven, A Houri, Virgin of paradise
Girl/Female
Indian, Punjabi, Sikh
Hour; Time
Boy/Male
Biblical
Four.
Female
Egyptian
, the mother of Hor-naskht.
Girl/Female
Indian
Hoor of heaven, A Houri, Virgin of paradise
HOUR ANGLE
HOUR ANGLE
Boy/Male
Hindu, Indian
Lord Shiva; Shiva Wear the Locket; One who has Eyes Like Rudra
Girl/Female
Indian
Gem, Jewel
Girl/Female
American, Australian, British, Chinese, Christian, English, French
Path; Roadway; Torch; Bright Light
Boy/Male
Hindu, Indian, Marathi, Sanskrit
Crocodile
Boy/Male
Tamil
Shiv Shankar | ஷிவஷஂகரÂ
Lord Shiva or auspicious or Lucky
Surname or Lastname
English
English : patronymic from Wick 2, or variant of the habitational name Wick, with genitive or plural -s. There has been much confusion between this name and Weeks.In 1638 Richard Wickes (also known as Richard Atwick), of Staines, Middlesex, England, died, leaving a bequest to “my son John Wickes now living in New England.†This John Wickes came from London, England, to Plymouth, MA, in 1635, and subsequently settled at Portsmouth, RI.
Male
English
Pet form of English Richard, RICHIE means "powerful ruler."
Boy/Male
Indian, Sanskrit
Lord of the Spoken Word
Male
Irish
Variant spelling of Irish Lugaid, LUGHAIDH means "oath."
Boy/Male
Hindu, Indian, Punjabi, Sikh
One who Meditates on the Lord
HOUR ANGLE
HOUR ANGLE
HOUR ANGLE
HOUR ANGLE
HOUR ANGLE
n.
The sum of four units; four units or objects.
a.
Hard; inflexible; obstinate; sour in aspect; hardy; bold.
v. t.
To cause to become sour; to cause to turn from sweet to sour; as, exposure to the air sours many substances.
n. pl.
Goddess of the seasons, or of the hours of the day.
v. t.
anything done successively, or by regular order; a turn; as, a tour of duty.
n.
A sour or acid substance; whatever produces a painful effect.
a.
White, or grayish white; as, hoar frost; hoar cliffs.
v. i.
To make a tourm; as, to tour throught a country.
n.
Fixed or appointed time; conjuncture; a particular time or occasion; as, the hour of greatest peril; the man for the hour.
a.
Having four corners or angles.
superl.
Cold and unproductive; as, sour land; a sour marsh.
a.
Having four wheels.
v. i.
To become sour; to turn from sweet to sour; as, milk soon sours in hot weather; a kind temper sometimes sours in adversity.
v. t.
A going round; a circuit; hence, a journey in a circuit; a prolonged circuitous journey; a comprehensive excursion; as, the tour of Europe; the tour of France or England.
superl.
Disagreeable; unpleasant; hence; cross; crabbed; peevish; morose; as, a man of a sour temper; a sour reply.
n.
A symbol representing four units, as 4 or iv.
n.
The time of the day, as expressed in hours and minutes, and indicated by a timepiece; as, what is the hour? At what hour shall we meet?
v. t.
To cause to flow in a stream, as a liquid or anything flowing like a liquid, either out of a vessel or into it; as, to pour water from a pail; to pour wine into a decanter; to pour oil upon the waters; to pour out sand or dust.
n.
Four things of the same kind, esp. four horses; as, a chariot and four.
possessive pron.
Of or pertaining to us; belonging to us; as, our country; our rights; our troops; our endeavors. See I.