... The system is based on two straight lines ("axes"), perpendicular to each other, each of them marked with the distances from the point where they meet ("origin")--distances to the right of the origin and above it, the origin being taken as positive and on the other sides as negative (see drawing below). ... One system (" polar coordinates ") uses the length r of the line OP from the origin to P (i. e. the distance of P distance to the origin) and the angle that line makes with the x-axis. ...

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• Trigonometry beyond 90 degrees

... 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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... One way (" polar coordinates ") uses the length r of the line OP from the origin to P (i. e. the distance of P distance to the origin) and the angle that line makes with the x-axis. ... Look again at the surveyor's telescope: the direction to which it points is completely specified by two angles--its azimuth f , the angle by which its base is rotated on a horizontal table-- and its elevation l (small Greek L), the angle by which it is lifted above the horizontal (if it looks down, l is negative). ...

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• Trigonometry beyond 90 degrees
• Corrected Geomagnetic Coordinates

... An OBJECT column gives the name of the object observed (usually a star name). ... In critical cases, it is common practice to measure sky on two or more positions around a target object, and these positions must be identified. ... A general treatment of this problem requires a column called OBJECT, bearing the usual name of the object (as in the star tables); a column labelled STARSKY, to distinguish between star+sky, star alone, or sky alone; and additional columns to identify the sky position. ...

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• HyperLEDA documentation: parameter: celpos
• Arcsecond Positions of UGC Galaxies
• Source Positions

Program: TRACE Purpose: TRACE plots image values at user given positions as function of distance to a plot centre (in 2-d (sub)sets). Category: ANALYSIS, PLOTTING File: trace.c Author: M.G.R. Vogelaar Keywords: INSET= Give set (, subset): Only one subset is allowed. ... XYBOX= Give size of box around one pixel: [3,3] The resulting value at a selected position is an average of the pixels in the defined box around that position. ... POSITION= Give position x, y: Physical values are allowed. ...

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

During observation the target is placed at the aperture (PC1, WF2, WFALL, etc.) specified on the Phase II proposal. ... The POS TARG special requirement can be used when a position offset is needed. ... The exact directions of the offsets are parallel to the rows and columns of the CCD on which the aperture is specified. ... This is specified in the Phase II proposal using the ORIENT special requirement. ... Figure 7.9 shows the CCD orientation and aperture locations relative to the U3 axis. ...

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• PSF Variations with Field Position
• PMSU2 - Table 1B
• Space Telescope Imaging Spectrograph Instrument Handbook

Set the display of the status bar, tool bar, locator bar, and properties associated with the display of the pointer position in the Locator bar. ... Set fixed point . ... When the fixed point is set, and the display format is (DX, DY), (DIST), or (R, Theta) then give the location relative to the fixed point. ... Set the fixed point to (0.0, 0.0). ... DX, DY] Display the delta in X and Y of the position of the mouse relative to the fixed point, or (0, 0) if no fixed point has been selected. ...

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• http://xray.sai.msu.ru/~ivan/gmt/man/mapproject.html
• Space position

... srcinfov strra=<ra> strdec=<dec> apos=<apos> withsrccoord=true|false . ... srcinfov computes for each instrument the position of a given celestial source in the field of view (in TELCOORD coordinates). Input is the satellite attitude in terms of Right Ascension/Declination of the star tracker viewing direction and astronomical position angle [deg]. ...

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• Description

... Positions in 2000 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2001 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2002 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2003 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . Positions in 2004 - Jan - Feb - Mar - Apr - May - Jun - Jul - Aug - Sep - Oct - Nov - Dec . ...

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• The Human Orrery

... Coordinate system . It is necessary to specify the coordinate system for the drilling of plug-plates so that the drilling file (currently named plPlugMap), plate drilling, cartridge, rotator wrap and the rotator itself are compatible. ... The TCC rotator angle (object system) is defined to be 0 degrees for this orientation. ... Thus, the rotator angle gives the conventional astronomical position angle on the sky of the y axis (although Russell won't acknowledge this necessarily). ...

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• lsst.tcc: python/tcc/axis/coordConvWithFP.py Source File
• lsst.coordConv: coordConv::Coord Class Reference
• lsst.coordConv: coordConv::PVTCoord Class Reference

I/146 Positions and Proper Motions (Roeser+ 1988) ================================================================================ Catalogue of Positions and Proper Motions Roeser S., Bastian U. =1988A .. ... 449R ================================================================================ ADC_Keywords: Positional data; Proper motions Description: PPM North gives J2000 positions and proper motions of 181,731 stars north of -2.5 degrees declination. ... The mean epoch is near 1931. ...

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• Positions and Proper Motions - South
• Supplement to the PPM Star Catalogue

... Activity 3: Measuring the Position of the Sun in the Sky . Purpose: To give students the opportunity to measure the position of the Sun in the sky using simple tools and methods. ... Alternatively, you may have students devise their own methods of relative measurement and apply them to measuring the position of the Sun in the sky. ... Rangi is the sky, and when the Sun is near Rangi's head it is summer in New Zealand. ... Read the Maori story to students. ... back to Teachers' Newsletter Main Page ...

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• ASP: Biography of a Star: Our Sun's Birth, Life, and Death
• ASP: To Every Season There is a Reason
• ASP: Star Science in the Autumn Sky

This is a copy of a Press Release from E.S.O. This photo shows the faint image (circled) of a new transneptunian object, discovered with the ESO 3.5-metre New Technology Telescope in October 1994. ... Six accurate positions were measured and allowed to determine an approximate distance of about 42 AU, that is 6300 million kilometres from the Sun. ... It has in the meantime been given the designation "1994 TG2" by the Minor Planet Center of the International Astronomical Union. ... ESO/La Silla | ...

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• POLIMODEL (V2.00) --- November00 --- POLIMODEL (V2.00)
• POLIMPLOT (V2.00) --- November00 --- POLIMPLOT (V2.00)
• sofi_test

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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• POLIMPLOT (V1.00) --- April99 --- POLIMPLOT (V1.00)
• Footnotes
• Space Telescope-European Coordinating Facility

Next: *wcscoord* all Up: Celestial Coordinates from Image Previous: *tvlabel, xexamine* . ... Type pixel coords in skypix . xr xspatial xs skypix .oformat = ``hours'' # to reset the default which is ``degrees''. xs skypix input coordinate system ( J2000 ): xdata$rh110267_img # the image file name output coordinate system ( J2000 ): image # to use coord conversion # in image file header or B1950 or J2000 # epoch of output can be specified input file list (STDIN): cr ...

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• The AstroStat Slog distance measure
• Spatial Region Coordinates
• *tvimcontour* - Overlay contours and/or source positions on the display

... Q 12.649 0.523 0.342 -0.108 4444 -4.647 -4.582 "n6231_ 178" 16 53 48.63 -41 51 54.1 J2000.0 ! ... A few lines are then added to the top (see readme_asc2dxf for details) to produce input for asc2dxf :in.coo: n6231cp6.dxf slot line 2.00 43.00 9.00 43.00 point 9.773 19.026 n6231 _ 171 Q 12.649 11.236 57.382 n6231 _ 178 I 14.533 ... the output of this program is as follows :n6231cp6.dxf: 0 SECTION 2 ENTITIES 0 CIRCLE 8 1 62 3 10 43.00 20 43.00 30 0.000 40 43.00 0 ...

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• http://www.mso.anu.edu.au/~brian/A3002/lecture1_last_a.pdf
• http://www.mso.anu.edu.au/pfrancis/simulations/structureformation.py

Coordinate Systems used for spacecraft trajectory description: . ... The HGI coordinates are Sun centered and inertially fixed with respect to an X-axis directed along the intersection line of the ecliptic and solar equatorial planes. ... Cometocentric (solar) Ecliptic Coordinate System (CSE) . ... CSE coordinate system for the SC POSITION: axis origin at comet center, X-axis to the SUN, Z-axis to ecliptic north pole, (X,Y)-plane is parallel to the ecliptic plane. ...

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• VEGA pr-7

Stellarium 0.12.3 . ... Classes . ... gSatTEME Class Reference . Sat position and velocity predictions over TEME reference system. ... Set compute epoch for prediction. ... gVector љ . ... Get the TEME satellite position Vector. ... Get the Geographic satellite subpoint Vector calculated by the method compute SubPoint. ... gVector Satellite position vector meassured in Km. x: position[0] y: position[1] z: position[2] . ... gVector Satellite Velocity Vector measured in Km/s x: Vel[0] . ...

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• Stellarium: TextParams Struct Reference
• Stellarium: VertexP3T2 Struct Reference
• Stellarium: LabelMgr Class Reference

... U. Amsterdam Explanation: The GRB distance scale controversy may have just ended with a flash . Gamma Ray Bursts (GRBs) are powerful explosions occurring in seemingly random positions on the sky. ... There they found a faint but variable optical source : a potential counterpart to the gamma-ray burst that was getting brighter. Most importantly, continued scrutiny showed that this optical transient had absorption lines with a redshift of about 0.8 - the distance scale of galaxies and quasars . ...

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• The Farthest Explosion Yet Measured
• Journal "Peremennye Zvezdy"
• Астронет > Optical Transient Near GRB970508 Shows Distant Redshift

... This plug-in enables you to add various types of lighting effects to your (RGB) image. ... Directional light . ... Well, you get the idea :) The default settings for this light-type is [-0.5,-0.5,-1.0]. ... Higher values makes your image reflect a lot of light (appear lighter or more intense), while smaller values makes it appear more dull or matte. ... A value of 1.0 makes your image very shiny (bright high-lights) while smaller values makes you image less shiny, making the high-lights dimmer. ...

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• APOD: 2000 October 19 - The Farthest Explosion Yet Measured
• APOD: May 13, 1997 - Optical Transient Near GRB970508 Shows Distant Redshift
• Dynamics of Pluto