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STARLAB
STARLAB

... Tips On Using STARLAB by Joyce Kloncz The first time you use STARLAB is an exciting event! If you are using it as a classroom teacher or as a planetarium director, you’ll want to make sure you are prepared before you begin. Here are some ideas that have been used in the past for a successful STARLA ...
The Early Evolution of Solids in Protoplanetary Disks
The Early Evolution of Solids in Protoplanetary Disks

Understanding Variable Stars - Central Florida Astronomical Society
Understanding Variable Stars - Central Florida Astronomical Society

... Variable stars are those that change brightness. Their variability may be due to geometric processes such as rotation, or eclipse by a companion star, or physical processes such as vibration, flares, or cataclysmic explosions. In each case, variable stars provide unique information about the properti ...
PhD thesis
PhD thesis

... 1 Massive star formation 1.1 Massive star formation . . . . . . . . . . . . . . . . . . . . . . 1.1.1 Observational massive star-forming features . . . . . . 1.2 Ionized gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2.1 Thermal emission from ionized gas . . . . . . . . . . . . 1.2. ...
1997 Apparition of Comet Hale-Bopp - HIGP
1997 Apparition of Comet Hale-Bopp - HIGP

... Solar System, and may provide clues to the physical and chemical conditions within the nebula out of which our Solar System formed. Comets are potentially our only direct samples of this early epoch in our history, and like the archaeologist who uses relics to piece together the chronology and struc ...
Me and My Shadow - Making the Sun-Earth - PS
Me and My Shadow - Making the Sun-Earth - PS

... Although horizontal sundials are more familiar to most people (due to the fact that horizontal sundials are by far the most common type of sundial), experience has shown that an equatorial sundial is better suited for making the connection between the Earth's rotation and solar time-keeping (see Are ...
Euler: Genius Blind Astronomer Mathematician
Euler: Genius Blind Astronomer Mathematician

... career, Euler created analytical mechanics, the refined and highly mathematical form of classical Newtonian mechanics2 that describes the motion of macroscopic objects, including astronomical bodies, such as planets, stars, and galaxies. The new tools Euler developed served to solve some of the most ...
X-Ray Spectroscopy of Stars
X-Ray Spectroscopy of Stars

Picturing Objects in the Making: Scheiner, Galileo and the Discovery
Picturing Objects in the Making: Scheiner, Galileo and the Discovery

... presented through images. Some of them (like the pictures of the lunar surface) seem quite realistic in traditional pictorial terms and testify to Galileo's training in the arts of d i ~ e g n o . ~ Hensedcontemporary chiaroscuro techniques for his drawings of the Moon, which were then transferred t ...
THE DEMOGRAPHICS OF LONG-PERIOD COMETS ABSTRACT
THE DEMOGRAPHICS OF LONG-PERIOD COMETS ABSTRACT

... a conservative upper limit: most of these lost objects were most likely either not real to begin with or fastmoving objects only visible for a short window of time. Secondly, some comets might have been inactive at these large heliocentric distances, and hence classified as minor planets. The minor p ...
harlow shapley - National Academy of Sciences
harlow shapley - National Academy of Sciences

SOFA Astrometry Tools
SOFA Astrometry Tools

... A star catalog can be constructed using any coordinate system that is fixed relative to the cosmological background: the choices of pole and longitude zero-point are essentially arbitrary. For some purposes galactic coordinates are convenient, while for some classical applications ecliptic coordinat ...
Observational evidence for AGN feedback in early
Observational evidence for AGN feedback in early

Lecture 2
Lecture 2

... Completing the z~3 Picture • Using molecular line emission at z=3, could probe cool gas • “low-excitation lines will map out a larger fraction of the ISM in these galaxies and…study in detail the spacially resolved kinematic structure of most of the gas…which resides in the cold phase” (Carilli & B ...
General NG Celestial Questions
General NG Celestial Questions

... A. rapid changes in GHA and declination introduce errors into the calculations B. lack of a well defined limb during certain phases and positions in the sky C. approximations used in the solution caused by the variable horizontal parallax D. augmentation effect caused by the relatively short distanc ...
A Brief Overview of the History of Western Astrology
A Brief Overview of the History of Western Astrology

... could be a threat to the emperor. The major astrological figure of the Roman era was Julius Firmicus Maternus, an astrologer, lawyer and Christian. Firmicus lived in the 4th century AD and is notable for spanning the divide between Christian and pagan thought. His masterwork, the Mathesis, is a pra ...
Global Seismology of the Sun
Global Seismology of the Sun

Worlds Beyond The Poles
Worlds Beyond The Poles

... South Pole “points” of theory. It is now established that we may at once journey into celestial land areas by customary movement on the horizontal from beyond the Pole points. It is also known that the flight course from this Earth to connecting land area of the universe about us which appears “up,” ...
Gaia 1 and 2. A pair of new satellites of the Galaxy
Gaia 1 and 2. A pair of new satellites of the Galaxy

Search For Gas Giants Around Late-m Dwarfs - STARS
Search For Gas Giants Around Late-m Dwarfs - STARS

... monitored these stars over four epochs in 2007. In addition to the measurement of relative radial velocity we established physical properties of these stars. The physical properties of M dwarfs we determined included the identification of neutral atomic lines, the measurement of pseudo-equivalent wi ...
The CCD Photometric Calibration Cookbook
The CCD Photometric Calibration Cookbook

... photographs and latterly CCD images. The techniques for calibrating CCD images are now well established. However, they must be applied carefully if accurate results are to be obtained. In essence, astronomical photometry is concerned with measuring the brightness of celestial objects. CCD (Charge-Co ...
Full text - FNWI (Science) Education Service Centre
Full text - FNWI (Science) Education Service Centre

... becoming gravitationally bound to our Oort Cloud (Sekanina, 1975). These comets encourage the idea of a comet group populating the interstellar medium. 2.3 Interstellar comets The group of comets that holds the main focus of this research is the group of dynamical comets on hyperbolic orbits. These ...
Giant star seismology
Giant star seismology

... Asteroseismology – the study of global properties of stars and their internal structure through their global intrinsic oscillations – is already more than a century old. An early remarkable result was obtained for Cepheids revealing the period-luminosity relation (Leavitt and Pickering, 1912), which ...
Science Case for the Chinese Participation of TMT
Science Case for the Chinese Participation of TMT

... reveal that the Universe is dominated by dark matter and dark energy. The nature of these two dark components is the most fundamental question in (astro-)physics today. The discovery of more than 400 extrasolar planet systems indicates that our solar system may be the exception rather than the norm; ...
Supernova - Wikipedia, the free encyclopedia
Supernova - Wikipedia, the free encyclopedia

... Swiss astrophysicist and astronomer Fritz Zwicky,[4][5] and was first used in print in 1926.[6] Several types of supernovae exist. Types I and II can be triggered in one of two ways, either turning off or suddenly turning on the production of energy through nuclear fusion. After the core of an aging ...
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Theoretical astronomy

Theoretical astronomy is the use of the analytical models of physics and chemistry to describe astronomical objects and astronomical phenomena.Ptolemy's Almagest, although a brilliant treatise on theoretical astronomy combined with a practical handbook for computation, nevertheless includes many compromises to reconcile discordant observations. Theoretical astronomy is usually assumed to have begun with Johannes Kepler (1571–1630), and Kepler's laws. It is co-equal with observation. The general history of astronomy deals with the history of the descriptive and theoretical astronomy of the Solar System, from the late sixteenth century to the end of the nineteenth century. The major categories of works on the history of modern astronomy include general histories, national and institutional histories, instrumentation, descriptive astronomy, theoretical astronomy, positional astronomy, and astrophysics. Astronomy was early to adopt computational techniques to model stellar and galactic formation and celestial mechanics. From the point of view of theoretical astronomy, not only must the mathematical expression be reasonably accurate but it should preferably exist in a form which is amenable to further mathematical analysis when used in specific problems. Most of theoretical astronomy uses Newtonian theory of gravitation, considering that the effects of general relativity are weak for most celestial objects. The obvious fact is that theoretical astronomy cannot (and does not try) to predict the position, size and temperature of every star in the heavens. Theoretical astronomy by and large has concentrated upon analyzing the apparently complex but periodic motions of celestial objects.
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