... Abstract Find the rotation matrix corresponding to a specified unit quaternion. ... Every rotation is represented by a unique orthogonal matrix; this routine returns that unique rotation matrix corresponding to q. The CSPICE routine m2q_c is a one-sided inverse of this routine: given any rotation matrix r, the calls m2q_c ( r, q ) q2m_c ( q, r ) leave r unchanged, except for round-off error. ... Version -CSPICE Version 1.3.1, 06-FEB-2003 (EDW) Corrected typo error in Examples section. ...

TYPES Trees are represented by two types: entree (enumerated tree) and bitree (bit tree). ... Also, it's possible to match patterns: tree <* treequery treequery >* tree The last two operations return TRUE if the node matches the treequery pattern. ... Example of how to add a node: select entree_next(tid) from dmoz where tid <* '1.2.3.*.0' order by tid desc limit 1; INDICES Type tree supports two types of indices: B-Tree - accelerates operations: <,>,<=,>= and =. ...

... A hundred years later, a handful of Tunguska-sized asteroids have been spotted by telescopes, but most remain unseen. The asteroid designated 2008 TC3 , which made the news on October 6th before colliding with the Earth on October 7th was too small to constitute a part of the "Earth impact hazard". ... 2008 TC3, for example, finally exploded in the atmosphere above Sudan . ... Wednesday, 8 October 2008 01:15 . International Year of Astronomy, Ireland National Node . ...

... In combining the data, it is assumed that the low resolution image better represents the short spacing data, whereas the high resolution best represents the fine structure. ... Key: out The output image. ... Key: factor The flux calibration factor. ... In practise, the calibration may not be perfect, and an extra calibration factor will be required to align the flux scales. "factor" gives the factor to scale the low resolution image to put it on the same flux scale as the high resolution image. ...

... The operators will be explained as they are used. The general notion to keep in mind is that any combination of these operators results in a 2- D affine coordinate transformation in the TF plane, which may be represented using the homogeneous coordinates often used in computer graphicsfoley. ... S _t_c,f_c = g_t_c,f_c,(_t) | ... We denote a time shift to the position , with an operator that has a multiplicative law of composition : (Table 1). ... Note that these two operators do not commute. ...

... We describe a new library (AST) which provides a flexible high-level programming interface for handling world coordinate systems in astronomy and for producing graphical output. ... Relationships between coordinate systems are represented within AST by objects called Mappings. ... While Mappings represent the relationships between coordinate systems, the coordinate systems themselves are represented by objects called Frames. ... Like all objects, a Frame also provides methods. ...

lsst.coordConv љ unknown . ... Classes . ... All љ Classes љ Namespaces љ Files љ Functions љ Variables љ Typedefs љ Enumerations љ Enumerator љ Pages . coordConv: Astronomical Coordinate Conversions . The coordConv package provides the following classes and functions. ... Coord : represents a position on the sky, with proper motion and radial velocity; provides easy access to spherical and cartesian position. ... Position conversion functions: . ... Time conversion functions: . ...

... This section introduces the architecture of the canvas, including the arrangement of items into hierarchical groups, and the many coordinate systems involved in using the canvas. ... World coordinates are conceptually infinite and are represented by a double . ... Buffer coordinates are canvas coordinates modified by some offset. ... void gnome_canvas_item_i2w_affine (GnomeCanvasItem* item , double affine[6] ); . void gnome_canvas_item_i2c_affine (GnomeCanvasItem* item , double affine[6] ); . ...

... The colors indicate the relative motions of galaxies with accurately measured distances, with shades of green and blue indicating motions toward us and shades of yellow to red indicating motions away from us. Our nearest neighbors have only small relative motions (represented by yellows and greens), as seen best in the exploded view of the right panel. We, along with all these nearest neighbors, are moving together toward the lower right corner of the figures. ...

. Computer Ephemeris. Lunar eclipse numerical map. Explanations. First portion of the page contains coordinates of sub-lunar points during the eclipse. Every point is represented with two numbers: geodetic longitude and geodetic latitude, both in degrees. Second portion of the page contains coordinates of the points at terminator line for the moments of contacts. There are 360 points on the lines, tens of them per line. The starting angle is indicated in the leftmost column.

... This is not important for drift observations but poses a problem for any observing mode in which the telescope is moving while taking data, since the ALFA beams then will be rotating on the sky. ... The new mode is called ' sky angle tracking ' and is available for all existing observing modes. ... The next figure shows the distance between the beams in declination as a function of hour angle when the telescope is tracking a source with Dec=+10 from rise to set with a sky angle of 19 degrees. ...

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

Stellarium 0.12.3 . ... Classes . ... Pulsar Class Reference . ... Pulsar (const QVariantMap &map) . ... Get a QVariantMap which describes the pulsar. ... getSelectPriority (const StelCore *core) const . ... getInfoString (const StelCore *core, const InfoStringGroup &flags) const . ... getVMagnitude (const StelCore *core, bool withExtinction=false) const . ... getAngularSize (const StelCore *core) const . ... getPositionInfoString (const StelCore *core, const InfoStringGroup &flags) const . ... core . ...

. User must specify the main plane and equinox of coordinate system by marking corresponding radio buttons, first in the left column Main plane and then in the right one Equinox . Paid attention to the fact that previously made choice of coordinate type (spherical or rectangular) and that of the type of positions (astrometric or geometric or apparent) constrains the choice in present item (see III.1. Basic concepts ).

Irregular phenomena in the Earth Pole oscillation process and temporal variations of geopotential Valery Bondarenko, Vadim Perepelkin s The observed irregular phenomena in the Earth Pole oscillation process are very variety. ... These phenomena indicated in the IERS data are the "abnormal" fluctuation of the Earth Pole coordinates which owing to changing of the geodynamical parameters gives negative result in interpolation and forecast of the first approximation mathematical model. ... Fig. ...

... The file names' construction . The flight (m) stage's file set . ... the orbital data used for the flight operation monthly (m) long-term planning, . ... The orbital calculations are based on the initial orbital data determined by KIAM RAN using the orbital radio measurements treatment.The determined initial orbital data are presented as a state vector (satellite position and velocity) in the J2000 reference. ... Accept the file with extension '.bgr', where the Moscow time (MT=UT+3h) is used. ...

... The experience of determination of the link between radio sources and dynamical reference frames is presented. To obtain this connection we used a series of very long baseline interferometry (VLBI) observations of the spacecraft Phobos-2 and angularly nearby quasars. ... The dynamical reference frame is determined by equator and equinox of these ephemerides. ... References . ... The relative orientation of the radio and dynamical reference frames can be described by a sequence of three rotations . ...

... DIAGNOSTICS OF IONOSPHERIC IRREGULARITY SPECTRUM USING MEASUREMENTS OF RADIO WAVE ANOMALOUS ATTENUATION UNDER VERTICAL SOUNDING . ... The selected experimental data are characterized by a high average level of attenuation of a signal of vertical sounding (10 dB and above), which cannot be caused by collisional absorption of radio waves (practically absent in a dark time of day) and, hence, being a consequence of scattering on random irregularities. ... ATTENUATION OF A VERTICAL SOUNDING SIGNAL . ...

... On-line Data . ... The program enables to find out the exact present Earth coordinates of the international space station and "Shuttle". ... J-Track - this program is similar to the previous one, however it knows how to display images and orbits of space vehicles. ... NASA SkyWatch - a program for those, who are fond of watching artificial space objects through the telescope, field - glass or with the unaided eye. ... Info: Industry news On-line Data Company ATLAS news Events We in press Contact . ...

Unknown numbers are usually represented by letters of the alphabet . ... However, different letters are also used, often hinting at the quantity they represent-- v for an unknown velocity, T for an unknown time, m or M for unknown masses and F for an unknown force. ... An example of case (#1) is the ratio between the length of a circle and its diameter, a universal constant appearing in many equations (for example, Kepler's equation in section (12a)), whose value to 11 decimals is 3.14159265359.. ...