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Monday, August 3, 2020 | History

2 edition of Refraction effects of atmosphere on geodetic measurements of celestial bodies. found in the catalog.

Refraction effects of atmosphere on geodetic measurements of celestial bodies.

C. S. Joshi

Refraction effects of atmosphere on geodetic measurements of celestial bodies.

by C. S. Joshi

  • 31 Want to read
  • 3 Currently reading

Published by Ohio State University in Ohio .
Written in English


Edition Notes

SeriesReport / Department of Geodetic Science -- no.192
ContributionsOhio State University. Department of Geodetic Science.
ID Numbers
Open LibraryOL13792930M

atmosphere. Atmospheric refraction will produce a signific ant change in the apparent zenith angle that varies with index of refraction and the altitude of the observed object. The magnitude of the refraction can be approximated by (Woolard and Clemence, ) R = r (1 −β)tanza −r (β− r 2)tan3 z a (1). II. Coordinate Reference Frame and Refraction Effects For specificity (Fig. 1), let a DSS be positioned at the origin (point O) of a topocentric coordinate system, and let α = ε+σ be the apparent elevation of a star at geometric elevation ε due to refraction, where σ is the stellar refraction correction. By definition, then, a ray viewed (or emitted) at the DSS at.

Manual of Geodetic Astronomy: Determination of Longitude, Latitude and Azimuth, Volume 4 Albert J. Hoskinson, Jacob Arthur Duerksen U.S. Government Printing Office, - Geodesy - pages. Effects of the Earth's Curvature and Atmospheric Refraction on estimating a target's position One must account for the curvature of the earth when determining the altitude of a target. Distant targets, which are close to the ground, cannot be seen by a radar because they will be below the horizon.

The propagation refraction due to the atmosphere, d atm, is given by =∫− +∫−∫ ray ray vac d atm (n 1) ds ds ds,(1) where the first term on the right-hand side is the excess path length due to the delay experienced by the signal propagating through the atmosphere, i.e. the propagation delay, and the term in. If atmospheric effects must be considered, this can be done by applying corrections to the measured values. This is the standard pro- cedure in the case of the effect of atmospheric refraction on angle and electronic distance measurements. A similar procedure is used for gravityFile Size: 2MB.


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Refraction effects of atmosphere on geodetic measurements of celestial bodies by C. S. Joshi Download PDF EPUB FB2

Astronomical refraction deals with the angular position of celestial bodies, their appearance as a point source, and through differential refraction, the shape of extended bodies such as the Sun and Moon.

Atmospheric refraction of the light from a star is zero in the zenith, less than 1′ (one arc-minute) at 45° apparent altitude, and still only ′ at 10° altitude; it quickly increases.

Brunner FK (c) The atmospheric effects on electromagnetic distance measurements in geodetic networks. DGK Reihe B /IV: 16–27 Google Scholar Brunner FK, Angus-Leppan () On the significance of meteorological parameters for terrestrial by: 6.

atmospheric refraction Refraction of light passing obliquely through a body's atmosphere. Light entering the Earth's atmosphere is bent toward the Earth, with the result that stars and other celestial bodies appear to be displaced very slightly toward the zenith.

Terrestrial refraction, sometimes called geodetic refraction, deals with the apparent angular position and measured distance of terrestrial is of special concern for the production of precise maps and surveys.

[24] [25] Since the line of sight in terrestrial refraction passes near the earth's surface, the magnitude of refraction depends chiefly on the temperature gradient near the. Angus-Leppan PV () Refraction above snow and ice surfaces. Int Symp on Terrestrial Electromagnetic Distance Measurements and Atmospheric Effects on Angular Measurements, Stockholm, Also Unisurv G21, Univ of New South Wales, Google ScholarCited by: 6.

Refraction, Geodetic a general term sometimes used to refer to different types and manifestations of refraction of electromagnetic waves associated with geodetic measurements. When such refraction occurs, the object being observed, that is, the source of the observed electromagnetic waves, is located within the earth’s atmosphere, whereas in the case.

Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of refraction is due to the velocity of light through air decreasing (the index of refraction increases) with increased density.

Atmospheric refraction near the ground produces mirages and can. Atmospheric refraction models in terrestrial and satellite geodesy. In: H.G. Henneberg (Editor), Recent Crustal Movements, Tectonophysics. It is shown that beams of light in the atmosphere normally are not circular.

In addition, the refraction correction of zenith angles for an exponentially stratified atmosphere is : Jurgen Stock. The atmosphere refracts the horizontal line of sight downward, making the level rod reading smaller. The typical effect of refraction is equal to about 14% of the effect of earth curvature.

Combined Effect of Curvature and Refraction in Survey. The combined effect of curvature and refraction is approximately. assessment of the celestial bodies effect on the geodetic measurements. Tasks of the work 1. To carry out the research on the potential of the tide caused by the celestial bodies.

To analyse the effect of the celestial bodies on to the gravity field elements. To assess and investigate the effect of File Size: KB. you know the actual definition is any natural body outside of the Earth's atmosphere.

examples are the Moon, Sun, and the other planets of our space. But those are very limited examples. The Kuiper belt contains many celestial bodies. Any asteroid. Already Ptolemy ( A.D.) noticed that the atmospheric refraction displaces the apparent position of celestial bodies toward the zenith [43].

Such a regular refraction is caused by the. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. This refraction is due to the velocity of light through air, decreasing (the refractive index increases) with increased density.

Atmospheric refraction near the ground produces mirages and can make. Atmospheric Refraction Speed of radio wave: r r r r r c u c c e e e m e m e m 1 0 = = 0 = ∝ Refractivity N = (n −1)⋅ Pressure and water-vapor content decrease rapidly with altitude, while temperature decreases slowly, refractivity and decreases with altitude.

File Size: KB. If the path of light travels through the lower atmosphere (i.e., commonly found with near‐ground geodetic measurements), terrestrial refraction is also called geodesic refraction, [cf.

Thomas and Joseph, ] or levelling refraction [e.g., Holdahl, ]. The present paper is concerned with terrestrial refraction in the lower by: The true elevation angles of the Sun are not corrected for atmospheric refraction, which is bending the light while passing through the Earth's atmosphere.

The effect of refraction depends on atmospheric conditions (pressure, temperature, relative humidity) and on the wavelength. Astronomic Refraction • • • • • • • • • •.

Observed to Apparent Place Figure Transformation of Apparent Place distribution~ motion, composition, and evolution of celestial bodies and phenomena".

Astronomy is the oldest of the natural sciences dating back to geodetic astronomy is essential Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of altitude.

This refraction is due to the velocity of light. The theory of astronomical refraction in a three-dimensionally inhomogeneous atmosphere Article (PDF Available) September with 42 Reads How we measure 'reads'.

EFFECTS OF ATMOSPHERIC REFRACTION ON FAR-FIELD SOUND PROPAGATION By Orvel E. Smith NASA George C. Marshall Space Flight Center SUMMARY Far-field sound intensity levels are calculated by using a theoretical model based on refraction laws.

The theoretical model requires a knowledge of the sound-source. Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the .Celestial navigation, also known as astronavigation, is the ancient and modern practice of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their ial navigation uses "sights", or angular measurements taken between a celestial body (e.g.

the Sun, the Moon, a planet, or a star) and. Refraction from to Viewed from ground level at Rio de Janeiro Sun orbiting is the real position of the sun, not the apparent position.

It is there just for reference. Lines represent the.