... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . View of the planets Uranus, Venus and Mars in the early evening western sky after sunset, as seen from Armagh at 7.00pm on 1 March 2015. ... Armagh Observatory reports that the next two weeks provide a rare opportunity to observe the planets Venus, Mars and Uranus in the western evening sky after sunset, and the bright planet Jupiter rising high in the East about the same time. ...

... 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). ...

... In the above example, the second region uses the global coordinate system (PHYSICAL by default). ... Supported systems include: name description ---- ----------- PHYSICAL pixel coords of original file using LTM/LTV IMAGE pixel coords of current file FK4, B1950 sky coordinate systems FK5, J2000 sky coordinate systems GALACTIC sky coordinate systems ECLIPTIC sky coordinate systems ICRS currently same as J2000 LINEAR linear wcs as defined in file In addition, two mosaic coordinate ...

Apparent Encounters of the Outermost Satellites of Jupiter c 2004 Ц. M. I. Varfolomeev, N. V. Emelyanov Sternberg Astronomical Institute, 13 Universitetskij prospect, 119992 Moscow, Russia e-mail: maximus@sai.msu.ru Abstract. Orbital parameters of any two planetary satellites may be refined from ground-based observations on the basis of differences in their astrometric coordinates. ... For these intervals we calculated apparent angular distances between satellites for the beginning of each day. ...

. Computer Ephemeris. Elements of osculating planetary orbits. Explanations. Each row contains at 0h of Time Dynamical Terrestrial of specified date in system of mean equator and ecliptic J2000.0 the ecliptic osculating elements of heliocentric orbit: inclination of orbital plane (degrees), longitude of ascending node (degrees), argument of perigelion (degrees), semimajor axis (astronomical units), mean motion (degrees per day), eccentricity (dimensionless), mean anomaly (degrees).

... This form allows you to query a database containing planetary data. Simply select the fields for the information desired. Select type of data to use: . Sun, Planets & Satellites Planets Only Satellites Only . ... Radius Mass Density Orbital Period Inclination . Tilt of Axis Eccentricity Escape Velocity Rotational Period . Albedo Mean Orbital Velocity Discoverer . ... Select the information to be included: . ... Rotational Period Albedo Mean Orbital Velocity Discoverer . ...

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... Up: Data Analysis Applications . ... Pixlib, an AXAF Science Center (ASC) coordinate library, has been developed as the continuing effort of (He 1997). ... In this paper, we will discuss the design and the configuration of the pixlib system, and show, as an example, how to integrate the library into ASC data analysis at XRCF. ... The following two functions, in addition to other generic configurations, effectively supply the system configuration for coordinate transformation at XRCF. ...

Clouds of gas between spiral arms . ... In the region of galactic longitudes 60 - 74 degree, latitudes +-15 degree and distances from centres of Galaxy 11 - 12 kpc 81 HI clouds are found and their parameters (figure 1) are measured. ... Average concentration of gas within clouds is 0.15 -3 cm. The life time of the clouds with such concentration between spiral arms permits to evaluate the velocity of ionization and to choose model of heating interstellar matter satisfying to these data. ...

... Classes . ... Nebula Class Reference . ... getInfoString (const StelCore *core, const InfoStringGroup &flags) const . ... getCloseViewFov (const StelCore *core=NULL) const . ... getVMagnitude (const StelCore *core, bool withExtinction=false) const . ... getSelectPriority (const StelCore *core) const . ... getEquinoxEquatorialPos (const StelCore *core) const . ... getJ2000GalacticPos (const StelCore *core) const . ... getPositionInfoString (const StelCore *core, const InfoStringGroup &flags) const . ...

Scale-heights of the Galactic disk subsytems with different ages and metallicities . V.Marsakov & Yu. ... It is based on the fact, that all stars cross the disk plane several times during their Galactic orbital period. ... We have used our representative sample of nearby disk F2-G2 stars Marsakov & Shevelev (1995) in which fundamental stellar parameters was determined on the basis of published date on uvby-photometry, proper motion and radial velocities. ... Marsakov V.A., Shevelev Yu.G. Bull. ...