... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

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• Trigonometry beyond 90 degrees
• The Lagrangian Point L1
• Trigonometry--what it is good for?

... La Section M-7 d crit le probl me de base de la trigonom trie (dessin gauche) : trouver la distance d'un point loign C, tant connues les directions de C par rapport aux extr mit s d'une ligne de base de grandeur AB. ... La longueur c de la ligne de base AB est plus petite que r . ... Par exemple, si nous savons que ? ... Pour les mesures de distances d' toiles, les astronomes emploient fr quemment le parsec , la distance d'une toile dont la parallaxe annuelle est 1"- une seconde d'arc. ...

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• Trigonometry beyond 90 degrees
• Exercices de Trigonom?trie
• Problems in Trigonometry

... connection points . ... The point P3 is the connection between the horizontal and vertical actuators and is the axis of rotation for the tail gunner motion. processing: survey/020204/reduc We can compute P3,P5 (the moveable points) in dome centerline coordinates if we have the actuator distances and we know the positions of the above connection points in dome centerline coordinates for a given position of the tertiary (say the nominal focus position).(see actuator distances to dome centerline ). ...

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• http://www.naic.edu/~phil/mbeam/hornpos.html
• rotaPlatToSky
• L-band Cross Scan Beam Maps

WCSLIB љ 5.15 . ... sph.h File Reference . Go to the source code of this file. intљ . sphx2s (const double eul[5], int nphi, int ntheta, int spt, int sxy, const double phi[], const double theta[], double lng[], double lat[]) . ... sphs2x (const double eul[5], int nlng, int nlat, int sll, int spt, const double lng[], const double lat[], double phi[], double theta[]) . ... sphdpa (int nfield, double lng0, double lat0, const double lng[], const double lat[], double dist[], double pa[]) . ...

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• casacore: casa::ParAngleMachine Class Reference
• casacore: measures/Measures/ParAngleMachine.h Source File
• WCSLIB: sph.h Source File

... the radiative transfer equation (RTE) for the randomly-irregular magnetized plasma has been derived on the base of general grounds of the multiple scattering theory . ... Solutions of several absolute tasks of the scattering theory have been obtained (on the optical depth of the ionospheric plasma layer, on the value of radio wave anomalous attenuation, on anomalous refraction, on the backscattered signal intensity for the source being placed within a plasma layer). ...

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• MONTE-CARLO

... Turn left on Calvert Street and proceed north approximately 3 1/2 miles to University Parkway. Turn left on University Parkway and proceed approximately 1/3 mile (past JHU stadium and down hill) to San Martin Drive. Turn left at the signal and proceed approximately 1/4 mile to STScI. ... Left onto Coldspring Lane and proceed approximately 1 mile to Roland Avenue (top of hill). ... Turn right at the signal and proceed approximately 1/4 mile to STScI. ...

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• CSPICE Routines: NPEDLN_C
• Abstract
• CSPICE Routines: DRDLAT_C

... Laboratory of Crystallization from High-Temperature Solutions (LCHTS) . ... Phase equilibria in oxide systems and growth of single crystals . High-T c superconductors (single crystals, targets, powders, ceramics) . ReBa 2 Cu 3 O 7-x . ... Ferromagnetics (single crystals - UHF devices (filters, modulators etc.) ... Scintillators (single crystals) . ... Growth of silicon carbide single crystals . SiC single crystals-semiconductor is "silicon" of 21 century . ...

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• Stuff LSR ISSP RAS

... Apparent Close Approaches of NEAs to the Stars for April 2016 Observatory 168 Kourovskaya 2016-Apr-01/18h24.9m/ Dist = 4.8 AV= 1.3 / min PA= 85.8° A= 50° h= 26° 1685 Toro RA= 8h07m57.634s Dec =+ 2°46'41.37 m= 16.0 UCAC2 32693651 RA= 8h07m57.649s Dec =+ 2°46'46.16 m= 15.1 2016-Apr-03/17h36.5m/ Dist = 10.0 AV= 5.3 / min PA= 53.5° A= 108° h= 24° 137170 1999 HF1 RA= 4h20m04.184s ...

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• http://www.gao.spb.ru/personal/neo/eng/approach/data/084.txt

Classroom Activity: Pinhole Protractor Gene Byrd and Renato Dupke . ... We cannot directly perceive the distances or sizes of far-away objects. Instead, our eyes only detect the angular size of objects. ... In Part II, which will appear in a future issue of The Universe in the Classroom, students will see how astronomers use parallax -- an extension of binocular vision -- to determine the distances of stars in the Sun's neighborhood. ... distance = 57.3 x physical size angular size (in degrees). ...

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• ASP: The New and Improved Hubble Space Telescope
• ASP: Star Science in the Autumn Sky
• ASP: This Restless Globe

... subroutine omatt open output file read the OSW window parameters , binning factors from header call CAL_GetBoresightMat call OAL_GetAttitude (with time of reference frame) find OM boresight direction rotate by roll angle loop over individual source information read in individual source information extract pixel position correct for distortion (CAL_omDistortion) ... For each pair of offsets compute a maximum-likelihood parameter and take the pair with the maximum value as the best...

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• Procedure
• strbs: Star Tracker BoreSight calculation

. Aristarchus was extremely clever and also figured out a way to determine the ratio of distances between the earth and the moon and the earth and the sun. While wrong, at least he reasoned that the sun was much farther from the earth than the moon. Just Try and Follow this! . Summary of Greek Science .

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• http://zebu.uoregon.edu/1999/ph123/constellation.html
• Historical Cosmologies
• Astronomy HyperText Book: Planetary Motion

lsst.coordConv љ unknown . ... Classes . ... coordConv::PVTCoord Class Reference . ... PVTCoord ( Coord const &coord, Eigen::Vector3d const &vel, double tai) . PVTCoord ( Coord const &coord0, Coord const &coord1, double tai, double deltaT) . PVTCoord ( PVT const &equatPVT, PVT const &polarPVT, PVT const &distPVT= PVT ()) . PVTCoord ( PVT const &equatPVT, PVT const &polarPVT, PVT const &distPVT, double equatPM, double polarPM, double radVel) . ... Definition at line 13 of file pvtCoord.h . ...

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• lsst.coordConv: coordConv::Coord Class Reference
• Plug-plate coordinate system
• Instrument Orientations and Offset Directions

. This view showcases Dione's tortured complex of bright cliffs. At lower right is the feature called Cassandra, exhibiting linear rays extending in multiple directions. The image was taken in polarized green light with the Cassini spacecraft narrow-angle camera July 24, 2006, at a distance of approximately 263,000 kilometers (163,000 miles) from Dione. NASA/JPL/Space Science Institute

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• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B6801350C-3419-40D1-A6FE-9B0611582FFB%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7BD6B5C1EB-B5C1-4EBA-8D1F-FA850C15A404%7D
• http://www.astronomy.com/sitefiles/resources/image.aspx?item=%7B57F7C707-9D5B-4B00-86BB-531D731F7C1C%7D

polimodel -- Produce model linear polarization and position angle images . ... Whether to apply random errors to output polarization and position angle values. seed = "" [integer] . ... This task produces a model linear polarization image and corresponding position angle image from an input image assumed to represent intensity (Stokes I parameter). ... A threshold for the input image can be defined such that polarization and position angle are not computed for input values less than this threshold. ...

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• Colours and magnitudes
• Distances

polimodel -- Produce model linear polarization and position angle images . ... Whether to apply random errors to output polarization and position angle values. seed = "" [integer] . ... This task produces a model linear polarization image and corresponding position angle image from an input image assumed to represent intensity (Stokes I parameter). ... A threshold for the input image can be defined such that polarization and position angle are not computed for input values less than this threshold. ...

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• SLITLESS (Oct97) --- ST_ECF --- SLITLESS (Oct97)

... The Raw Images . Table 1: List of Viking Orbiter Images of the "Face on Mars" . ... Processing the Face Images . ... In July, 1976, Viking Orbiter 1 was acquiring images of the Cydonia region of Mars as part of the search for potential landing sites for Viking Lander 2. ... Using the height field, it is also possible to view the "Face" from different look directions, by mapping the Viking Orbiter image directly on the the topography and then placing the "viewer" at different locations. ... Mars . ...

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• Triton - Voyager 2
• Tracing Dust in Spiral Galaxies
• Saturn's Moon Phoebe

Operations in Point operations use the pointer to query sets about points, delete points in a set, and move points. In all cases where interaction is required, pressing the right mouse button with the pointer in the drawing area cancels the operation. ... Report on a point in a set . ... Press the left mouse button. ... Press Delete point with the left mouse button to activate. ... Move the pointer to the new location and press the left mouse button again to register the point's new location. ...

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• http://xray.sai.msu.ru/~ivan/gmt/man/grdgradient.html
• http://xray.sai.msu.ru/~ivan/gmt/man/pswiggle.html
• PROBLEMS OF THEORETICAL COSMOLOGY - UISS2000

... 8, ``Celestial Mechanics'', 2002 Families of periodic solutions of the planar restricted three--body problem and their application at designing the orbit for the space radio telescope B. B. Kreisman Astro Space Center of Lebedev Physical Institute of Russian Academy of Sciences, Moscow, Russia 1. ... The monodromy matrix allows to define the directions of prolongation both of initial family, and of a family, induced by it as the solutions of second kind. If there is no second integral at q ? ...

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• http://www.ipa.nw.ru/conference/2002/sovet/PS/DESCAM.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/CALLEG.PS
• http://www.ipa.nw.ru/conference/2002/sovet/PS/IVASHKIN.PS

... The described algorithm is suitable for measurements of complex images of stars. ... a) the zero-based number of stars in the complex (multicentric) image, . b) set of preliminary coordinates - x i , y i , for all stars, index i is number of a star, . ... i - index of a star in the complex image; . ... These parameters are calculated by a nonlinear method of a least squares.The main output parameters of this algorithm are x i , y i ; where the index i is number of a star in the multicentric image. ...

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The velocity corrected for infall of the Local Group towards Virgo is noted vvir . It is calculated as: vvir = vlg + 208 cos(theta) Where vlg is the velocity relative to the Local Group, 208 km/s is the infall velocity of the Local Group according to Theureau et al. 1998 and Terry et al. 2002 and where theta is the angular distance between the observed direction and the direction of the center of the Virgo cluster (SG 104 -2). ...

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• The Modified Gauss--Newton Method.
• Getting the Dispersion Solution
• Ned Wright's Cosmology Tutorial - Part 1