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Imaginary point directly above a particular location, on the imaginary celestial sphere
measuring the zenith angle (or zenith angular distance), the angle between a direction of interest (e.g. a star) and the local zenith - that is, the complement
Zenith
Angle between the zenith and the centre of the Sun's disc
The solar zenith angle is the zenith angle of the Sun, i.e., the angle between the sun’s rays and the vertical direction. It is the complement to the
Solar_zenith_angle
Apparent curve that separates earth from sky
the observer is elevated, the horizon zenith angle can be greater than 90°. The maximum visible zenith angle occurs when the ray is tangent to Earth's
Horizon
Arc-like path that the Sun appears to follow across the sky
and the cost-effective use of solar trackers. The solar zenith angle is the zenith angle of the Sun, i.e., the angle between the sun’s rays and the vertical
Sun_path
Azimuth angle of the Sun's position
relative direction along the local horizon, whereas the solar zenith angle (or its complementary angle solar elevation) defines the Sun's apparent altitude
Solar_azimuth_angle
Coordinates comprising a distance and two angles
The polar angle may be called inclination angle, zenith angle, normal angle, or the colatitude. The user may choose to replace the inclination angle by
Spherical_coordinate_system
Use of coordinates for representing vectors
={\begin{bmatrix}\rho \\\angle \theta \\\angle \phi \end{bmatrix}}} Where ρ is the magnitude, θ is the azimuth angle, and φ is the zenith angle. Like polar and
Vector_notation
2004 novel by Bruce Sterling
The Zenith Angle is a science fiction novel by American writer Bruce Sterling, first published in 2004, about a pioneering expert in computer and network
The_Zenith_Angle
Amount of air seen through in astronomical observations
that at zenith. So, by definition, the relative air mass at the zenith is 1. Air mass increases as the angle between the source and the zenith increases
Air_mass_(astronomy)
Measurement of electromagnetic radiation
the sum of direct irradiance (after accounting for the solar zenith angle, z {\displaystyle z} , of the Sun) and diffuse horizontal irradiance: GHI = DHI
Solar_irradiance
Type of celestial coordinate system
Alternatively, zenith angle may be used instead of altitude, as they are complementary angles (the sum of the altitude angle and the zenith angle is 90°). "(Az
Horizontal_coordinate_system
The amount of heat energy received at any location on the globe is a direct effect of Sun angle on climate, as the solar zenith angle (the angle of incidence
Effect of Sun angle on climate
Effect_of_Sun_angle_on_climate
Fraction of incoming sunlight reflected by clouds
of the cloud and the solar zenith angle. The variation of albedo with zenith angle is most rapid when the sun is near the horizon, and least when the sun
Cloud_albedo
small angles, the Chapman function is approximately equal to the secant function of the zenith angle, sec ( z ) {\displaystyle \sec(z)} . The Chapman
Chapman_function
Physical law on the emissive power of black body
as the zenith angle and φ as the azimuthal angle; and the small flat blackbody surface lies on the xy-plane, where θ = π/2. The intensity of the light
Stefan–Boltzmann_law
Directional planes
horizontal (radio propagation) Vertical circle Vertical position Zenith Zenith angle (vertical angle) Hofmann-Wellenhof, B.; Moritz, H. (2006). Physical Geodesy
Vertical_and_horizontal
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
Figure formed by two rays meeting at a common point
Irrational angle Phase (waves) Protractor Solid angle Spherical angle Subtended angle Tangential angle Transcendent angle Trisection Zenith angle This approach
Angle
Scientific law describing absorption of light
} where θ is the observed object's zenith angle (the angle measured from the direction perpendicular to the Earth's surface at the observation site)
Beer–Lambert_law
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
Angle in geometric optics
angle on climate Phase angle (astronomy) Plane of incidence Reflection (physics) Refraction Scattering vector Total internal reflection Zenith angle Godse
Angle_of_incidence_(optics)
Nearest star to the Solar System
south of the zenith, the angle to the zenith is equal to the Latitude minus the Declination. The star is hidden from sight when the zenith angle is 90°
Proxima_Centauri
British comic superhero
Zenith is a British superhero comic strip which appeared in the magazine 2000 AD. Created by writer Grant Morrison and artist Steve Yeowell, with original
Zenith_(comics)
Calculating the Sun's location in the sky at a given time and place
coordinate system. The resulting Sun angles are the solar zenith angle and solar azimuth angle, which can be used to depict the Sun path. This calculation is
Position_of_the_Sun
the airmass given, approximately, by A M = 1 cos θ {\displaystyle AM={\frac {1}{\cos \theta }}} with θ being the solar zenith angle (90° minus the altitude)
Direct_solar_irradiance
Polarization pattern of the daytime sky
is the angle between the zenith direction and the solar direction at the observed pointing, and ψ is the angle between the solar direction and the observed
Rayleigh_sky_model
Amount of atmosphere that sunlight must pass through
is the zenith angle, typically in degrees. The above approximation overlooks the atmosphere's finite height, and predicts an infinite air mass at the horizon
Air_mass_(solar_energy)
Metric quantifying vegetation density
was confounded by these differences in solar zenith angle across this strong latitudinal gradient. With the assistance of a resident mathematician (Dr.
Normalized difference vegetation index
Normalized_difference_vegetation_index
Adaptive optics optimization freuqency
dz\right]^{3/5}} With ζ {\displaystyle \zeta } the zenith angle, v W i n d ( z ) {\displaystyle v_{\mathrm {Wind} }(z)} the wind speed as function of height and
Greenwood_frequency
Physical quantity in radiometry
2π steradians of a hemisphere decreased by integration over the cosine of the zenith angle. Radiance of a surface, denoted Le,Ω ("e" for "energetic", to
Radiance
Subgenres of the science fiction genre
novel The Zenith Angle, which follows the story of a hacker whose life is changed by the September 11 attacks, as "nowpunk". The developers of the computer
Cyberpunk_derivatives
Differential operator in mathematics
\varphi ^{2}}},} where φ represents the azimuthal angle and θ the zenith angle or co-latitude. In particular, the above is equivalent to Δ f = ∂ 2 f ∂
Laplace_operator
Measurement of strength of sunburn-producing ultraviolet (UV) radiation
are made by a computer model that accounts for the effects of Sun–Earth distance, solar zenith angle, total ozone amount, tropospheric aerosol optical
Ultraviolet_index
Function of four real variables that defines how light is reflected at an opaque surface
azimuth angle ϕ {\displaystyle \phi } and zenith angle θ {\displaystyle \theta } , therefore the BRDF as a whole is a function of 4 variables. The BRDF has
Bidirectional reflectance distribution function
Bidirectional_reflectance_distribution_function
If the value of log(I/I' ) is plotted against the sun's zenith angle, it is observed that this log-intensity ratio decreases as the zenith angle increases
Umkehr_effect
Meteorological instrument
shifts and the specified tilt angle from the vertical. The tilt angle, or zenith angle, is generally 15 to 30 degrees, and the horizontal beams are typically
Sodar
System of complete and orthogonal polynomials
and θ is the angle between the position of the observer and the ẑ axis (the zenith angle), the solution for the potential will be Φ ( r , θ ) = ∑ ℓ = 0 ∞
Legendre_polynomials
Space-borne earth reflectance sensor
function of solar zenith angle; calibrated NOAA-9 near-nadir reflectances are used to generate the curves that can then derive the calibrations for other
Advanced Very-High-Resolution Radiometer
Advanced_Very-High-Resolution_Radiometer
Particular mapping that projects a sphere onto a plane
the sphere (with φ {\displaystyle \varphi } the zenith angle, 0 ≤ φ ≤ π {\displaystyle 0\leq \varphi \leq \pi } , and θ {\displaystyle \theta } the azimuth
Stereographic_projection
Radio telescope in Guizhou, China
arcseconds. The maximum zenith angle is 40 degrees when the effective illuminated aperture is reduced to 200 m, while it is 26.4 degrees when the effective
Five-hundred-meter Aperture Spherical Telescope
Five-hundred-meter_Aperture_Spherical_Telescope
American author, speaker and futurist (born 1954)
Heavy Weather (1994) Holy Fire (1996) The Zenith Angle (2004) The Caryatids (2009) Love Is Strange (2012) In the beginning of his childhood he lived in
Bruce_Sterling
Geometric object
\theta \\w&=w\end{aligned}}} where r is the radius, θ is the zenith angle, φ is the azimuthal angle, and w is the height. Cartesian coordinates can be converted
Spherinder
Science of determining the positions of points and the distances and angles between them
horizontal alignment. The vertical circle measures the angle that the telescope makes against the vertical, known as the zenith angle. The horizontal circle
Surveying
Wide-angle photographic lens with strong barrel distortion
(equiangular) projection, in which distance along the radius of the circular image is proportional to the zenith angle. As fisheye lenses gained popularity in general
Fisheye_lens
Model of the extended complex plane plus a point at infinity
(\theta ,\varphi )} on the sphere (with θ {\displaystyle \theta } the zenith angle and φ {\displaystyle \varphi } the azimuth), the projection is ζ = x +
Riemann_sphere
Japanese neutrino observatory
the rock beneath the detector, but stop in the inner detector. The number of observed neutrinos is predicted uniformly regardless of the zenith angle
Super-Kamiokande
Surveying technique
a total station, or any other instrument to read the vertical, or zenith angle to the rod, and the change in elevation is calculated using trigonometric
Levelling
Type of radiant energy
solar irradiance and is sensitive to solar zenith angle and cloud cover. Outgoing longwave radiation However, the definition of thermal infrared may start
Shortwave_radiation_(optics)
Physics concept
the zenith angle corresponding to the given path. Therefore, T = e − τ = e − m τ ′ {\displaystyle T=e^{-\tau }=e^{-m\tau '}} The optical depth of the
Optical_depth
Assembly of photovoltaic cells used to generate electricity
stationary throughout the day at a given tilt (zenith angle) and facing a given direction (azimuth angle). Tilt angles equivalent to an installation's latitude
Solar_panel
1908 air burst explosion in Siberia, Russia
similar to the pattern found at the Tunguska site. The experiments suggested that the object had approached at an angle of roughly 30° from the ground and
Tunguska_event
Deviation of light as it moves through the atmosphere
All Zenith Angles". Astronomical Journal. 119 (5): 2472–2474. Bibcode:2000AJ....119.2472A. doi:10.1086/301325. S2CID 121417663. This paper and the method
Atmospheric_refraction
Ratio of how much light is reflected back from a body
has been shown that the albedo at a particular solar zenith angle θi can be approximated by the proportionate sum of two terms: the directional-hemispherical
Albedo
Tomography technique based on high-energy muon particles
method). From here the calculations are normalized for the zenith angle of the flux. Despite the various benefits of using cosmic ray muons for imaging
Muon_tomography
Let (x, y, z) be the standard Cartesian coordinates, and (ρ, θ, φ) the spherical coordinates, with θ the angle measured away from the +Z axis (as illustrated)
List of common coordinate transformations
List_of_common_coordinate_transformations
Formula for radiative heat transfer
ds=dz/\cos \theta } , where θ {\displaystyle \theta } is the zenith angle (away from vertical). Then the upward and downward intensities are integrated over
Schwarzschild's equation for radiative transfer
Schwarzschild's_equation_for_radiative_transfer
How large a sphere or circle appears
{\frac {d_{\mathrm {act} }}{2D}}} as the sine.[citation needed] The formula is related to the zenith angle to the horizon, δ = π − 2 arccos ( R R + h
Angular_diameter
Sensor for measuring thermal radiation
to the surface, 0 degrees angle of incidence), zero response when the radiation is at the horizon (90 degrees angle of incidence, 90 degrees zenith angle)
Gardon_gauge
Second-largest moon of Jupiter
significantly higher, with values in the range of 4 x 1014 cm−2 to 4 x 1015 cm−2 depending on the solar zenith angle and orbital position. Because this
Callisto_(moon)
Diagrammatic representation of Sun's position over a period of time
pointing to the center of the Sun all the time. If the position of the Sun is calculated, the solar zenith angle and solar azimuth angle at one-hour steps
Analemma
Fiction in a setting defined in part by climate crisis
October 2023. Killheffer, Robert K. J. (October 2004). "White Devils/The Zenith Angle/Forty Signs of Rain (Book)". Fantasy & Science Fiction. 107 (4/5):
Climate_fiction
Layer of gasses surrounding the moon Titan
wavelengths have shown that the twilight periods (phase angles > 150°) are brighter than the daytime on Titan. This observation has not been observed
Atmosphere_of_Titan
Science of measuring the shape, orientation, and gravity of Earth
azimuth (direction angle within the plane of the horizon), elevation angle (or zenith angle), distance. North celestial pole: the extension of Earth's
Geodesy
Measure of how much of an antenna's signal is transmitted in one direction
are the zenith angle and azimuth angle respectively in the standard spherical coordinate angles; U ( θ , ϕ ) {\displaystyle U(\theta ,\phi )} is the radiation
Directivity
Seasonal change of clock settings
factor on clear days: its observed dependence on solar zenith angle and its relevance to the shadow guideline for sun protection". Photochemistry and
Daylight_saving_time
Horizontal angle from north or other reference cardinal direction
Sextant Solar azimuth angle Sound Localization Zenith The singular form of the noun is Arabic: السَّمْت, romanized: as-samt, lit. 'the direction'. "azimuth"
Azimuth
Loss of one degree of freedom in a three-dimensional, three-gimbal mechanism
about an azimuth (horizontal angle) and elevation (vertical angle). These two-dimensional systems can gimbal lock at zenith and nadir, because at those
Gimbal_lock
The Zenith Angle (2004) A techno-thriller about a cyber-security expert who goes to work for the U.S. government fighting terrorism after 9/11. The Caryatids
Bruce_Sterling_bibliography
Solar radiation reaching the Earth's surface
irradiance, z {\displaystyle z} is the solar zenith angle, and DirHI is the direct horizontal irradiance. One of the equations for total solar radiation on
Diffuse_sky_radiation
Set of multiple antennas which work together
{\displaystyle \theta } and ϕ {\displaystyle \phi } being the zenith angle and azimuth angle, respectively. If the spacing between adjacent elements is constant,
Antenna_array
Topics referred to by the same term
psychiatric diagnosis with symptoms of a mood disorder and schizophrenia Solar zenith angle, in astronomy and earth science Soyo Airport, in Angola (IATA airport
SZA_(disambiguation)
Measure of imaging quality in astronomy
/\lambda } is the wavenumber. If not specified, the path is assumed to be in the vertical direction. When observing a star at a zenith angle ζ {\displaystyle
Fried_parameter
Function in fluid dynamics
φ ), r is the radial distance from the origin, θ is the zenith angle and φ is the azimuthal angle. In axisymmetric flow, with θ = 0 the rotational symmetry
Stokes_stream_function
Maximum energy available for use
radiation with solar zenith angle of 0 degrees) and AM4 (terrestrial solar radiation with solar zenith angle of 75.5 degrees). The solar spectrum at sea
Exergy
Formulation of classical mechanics
origin, θ is polar angle (also known as colatitude, zenith angle, normal angle, or inclination angle), and φ is the azimuthal angle, the Lagrangian for a
Lagrangian_mechanics
Instrument for measuring solar irradiance
(normal to the surface, sun at zenith, 0° angle of incidence), zero response when the sun is at the horizon (90° angle of incidence, 90° zenith angle), and
Pyranometer
Equation in atmospheric chemistry
ozone is directly related to the solar intensity, and hence to the zenith angle, due to the reliance on photolysis of NO2. The yield of ozone will therefore
Leighton_relationship
Geometry of global positioning systems
The IPP or Ionospheric Pierce Point is the altitude in the ionosphere where electron density is greatest. These points can change based on factors like
Ionospheric_pierce_point
2004 hard science fiction novel by Kim Stanley Robinson
August 29, 2012. Killheffer, Robert K. J. (October 2004). "White Devils/The Zenith Angle/Forty Signs of Rain (Book)". Fantasy & Science Fiction. 107 (4/5):
Forty_Signs_of_Rain
Type of radio propagation
characteristics due to differences in ionization density, shifting zenith angles, effects of the Earth's magnetic dipole contours, antenna radiation patterns
Non-line-of-sight_propagation
Formats used for Ambisonics
values and uses the physics convention for spherical coordinates where θ {\displaystyle \theta } is the zenith angle (angle from the positive Z-axis)
Ambisonic data exchange formats
Ambisonic_data_exchange_formats
Radar systems used to study the interaction between the Sun and the Earth
steerable in the meridional plane (-30° to 60° zenith angle), and electronically steerable in the longitudinal direction (±12° off-boresight). The receiving
EISCAT
Field of regularly spaced ice formations formed by sublimation at high altitudes
become tilted toward the north, at approximately the noontime solar zenith angle, which varies seasonally. The lower limit to the altitude of penitente-formation
Penitente_(snow_formation)
Dimensionless quantity that characterizes plant canopies
the canopy and at ground level, and factoring in the leaf angle distribution, solar zenith angle, and plant extinction coefficient. Such indirect methods
Leaf_area_index
Atmospheric phenomenon
von Hobe, M. (July 2011). "ClOOCl photolysis at high solar zenith angles: analysis of the RECONCILE self-match flight". Atmos. Chem. Phys. 12 (3): 1353–1365
Ozone_depletion
density (the observation is performed looking straight up, with the sun at full zenith) and the slant column density (same observation angle, sun at some
Differential optical absorption spectroscopy
Differential_optical_absorption_spectroscopy
City in Sicily, Italy
(thanks to the zenith angles from which they are observed, they have been described for millennia as among the most beautiful in the world). The configuration
Syracuse,_Sicily
Perceived variation in the Moon's size
smaller in angular size when at the horizon than when above. The angle that the diameter of the full Moon subtends at an observer's eye can be measured directly
Moon_illusion
Cascade of atmospheric subatomic particles
years later. He also noted that the coincidence rate drops significantly for cosmic rays that are detected at a zenith angle below 60 ∘ {\displaystyle 60^{\circ
Air_shower_(physics)
Brightness of a celestial object observed from the Earth
in the sky to the target are favoured (to avoid large differences in the atmospheric paths). If those stars have somewhat different zenith angles (altitudes)
Apparent_magnitude
Model of rotating physical systems
R3. In the physics convention the coordinates are the co-latitude (zenith) angle θ {\displaystyle \theta \,} , the longitudinal (azimuth) angle φ {\displaystyle
Rigid_rotor
Complement of latitude; polar angle
coordinate system, a colatitude is the complementary angle of a given latitude, i.e. the difference between a right angle and the latitude. In geography, Southern
Colatitude
Study of the physical properties of the Earth's gravity field
vertical angles (zenith angles or, alternatively, elevation angles) are obtained with respect to this local vertical, and horizontal angles in the plane
Physical_geodesy
Indian orbiter mission to Mars (2013–2022)
planet. Data with incidence and zolar zenith angle greater than 60° was also discarded to reduce atmospheric effects. The bright regions having an albedo greater
Mars_Orbiter_Mission
determine the total atmospheric delay, is its known dependence of the zenith or elevation angle of the satellite. If z {\displaystyle z} is the zenith angle, the
GPS_meteorology
Aspect of timekeeping
factor on clear days: its observed dependence on solar zenith angle and its relevance to the shadow guideline for sun protection". Photochemistry and
Analysis of daylight saving time
Analysis_of_daylight_saving_time
is simple to determine if one knows the solar zenith angle θ: m = 1/cos(θ). As time passes, the Sun moves across the sky, and therefore θ and m vary according
Langley_extrapolation
19th-century survey to measure the Indian subcontinent
shaded from the sun and with constant tension. The early surveys made use of large and bulky theodolites made by William Carey, a zenith sector made by
Great_Trigonometrical_Survey
Measure of cloudiness of sea water
this, the effects of Rayleigh scattering are calculated based on the satellite viewing angle and the solar zenith angle and then subtracted from the band
Ocean_turbidity
Study of adaptation of an organism's physiology to environmental conditions
light occurs at the top of canopies and on open ground when cloud cover is low and the sun's zenith angle is low, typically this occurs in the tropics and
Ecophysiology
THE ZENITH-ANGLE
THE ZENITH-ANGLE
Boy/Male
Hindu, Indian
Tiger
Male
Spanish
Contracted form of Spanish Benedicto, BENITO means "blessed."Â
Boy/Male
Arabic
Zenith; Climax
Female
German
Pet form of German Kätharina, KÄTHE means "pure."
Female
Hebrew
(×Ö¸×¡Ö°× Ö·×ª) Variant form of Hebrew AcÄ•nath, AZENETH means "belonging to the goddess Neith."
Female
Spanish
Feminine form of Spanish Benito, BENITA means "blessed."
Boy/Male
English
From the enclosure.
Male
English
English surname transferred to forename use, derived from the Middle English word tye, TYE means "pasture."
Boy/Male
Australian, Hindu, Indian
Peak
Girl/Female
Australian, Indian
Highest; At the Top; First
Boy/Male
Gujarati, Indian
Apocalypse
Male
English
Variant spelling of English Kenneth, KENNITH means both "comely; finely made" and "born of fire."Â
Female
Welsh
Welsh name derived from the word gwenith, GWENITH means "wheat."
Boy/Male
Hindu
Boy/Male
Anglo Saxon
From Penrith.
Male
English
Variant spelling of English Kenneth, KENITH means both "born of fire" and "comely; finely made."
Boy/Male
Hindu, Indian
Bright
Boy/Male
Hindu
Boy/Male
Hindu
Computer
Boy/Male
Hindu, Indian
Lotus (Water Lily)
THE ZENITH-ANGLE
THE ZENITH-ANGLE
Girl/Female
Arabic
Small; Lass
Boy/Male
Hindu
Boy/Male
American, British, English
Mighty Spearman; Spear Strong; Variant of Garrett
Girl/Female
Tamil
Jayalalitha | ஜயலலீதா
Victorious Goddess durgaji
Girl/Female
Bengali, Gujarati, Hindu, Indian, Kannada, Sanskrit, Tamil, Telugu
Speech; Goddess Saraswati
Female
Spanish
Latin name derived from (dies) natalis, NATALIA means "birthday," or in Church Latin "Christmas day." In use by the Spanish.
Boy/Male
Hindu, Indian, Kannada, Telugu
Servant of Musical Tunes
Boy/Male
Tamil
Help, Lord Shiva
Female
Irish
Irish name, probably derived from the Gaelic vocabulary word úna, ÚNA means "famine, hunger." In Irish legend, this was the name of the sweetheart of poet Tomás Costello, who withered away and died after being forbidden by her parents to see him.
Girl/Female
Indian
Love, Friendship
THE ZENITH-ANGLE
THE ZENITH-ANGLE
THE ZENITH-ANGLE
THE ZENITH-ANGLE
THE ZENITH-ANGLE
a.
Of or pertaining to the zenith.
a.
Of half the whole or ordinary length, as a picture.
n.
The tenth part of annual produce, income, increase, or the like; a tithe.
n.
See Zenick.
n.
The interval between any tone and the tone represented on the tenth degree of the staff above it, as between one of the scale and three of the octave above; the octave of the third.
n.
A temporary aid issuing out of personal property, and granted to the king by Parliament; formerly, the real tenth part of all the movables belonging to the subject.
a.
The quality or state of being long, in space or time; extent; duration; as, some sea birds are remarkable for the length of their wings; he was tired by the length of the sermon, and the length of his walk.
n.
That point in the visible celestial hemisphere which is vertical to the spectator; the point of the heavens directly overhead; -- opposed to nadir.
a.
The longest, or longer, dimension of any object, in distinction from breadth or width; extent of anything from end to end; the longest line which can be drawn through a body, parallel to its sides; as, the length of a church, or of a ship; the length of a rope or line.
a.
A single piece or subdivision of a series, or of a number of long pieces which may be connected together; as, a length of pipe; a length of fence.
n.
Vertical position; zenith.
a.
Rising toward the zenith; above the horizon.
adv.
By that; by how much; by so much; on that account; -- used before comparatives; as, the longer we continue in sin, the more difficult it is to reform.
definite article.
A word placed before nouns to limit or individualize their meaning.
a.
A portion of space or of time considered as measured by its length; -- often in the plural.
n.
hence, figuratively, the point of culmination; the greatest height; the height of success or prosperity.
n.
See Yenite.
v. i.
See Thee.
n.
The tenth part of the annual profit of every living in the kingdom, formerly paid to the pope, but afterward transferred to the crown. It now forms a part of the fund called Queen Anne's Bounty.
a.
Detail or amplification; unfolding; continuance as, to pursue a subject to a great length.