The entire course syllabus is a disaster and meant to create issues and confrontation. It was poorly written, dreamed up, and executed.
Astronomy Terminology In this tutorial WorldWide Telescope is used to demonstrate the how to write a coursework planets behind some of the most commonly used terms in astronomy.
Also ensure View from this location is not selected in the View pane. Objects in the sky are located using right ascension RA and declination Dec.
Right ascension in space is equivalent to longitude on the Earth. Longitude is an east-west bearing from the Greenwich Meridian, right ascension is the east-west bearing from an equally arbitrary point in space - the point where the Sun crosses the celestial equator on the March equinox.
The equinox is chosen because at this point the Earth is neither tilted towards or away from the Sun, but instead is vertically aligned with the Sun the solstices occur when the tilt is at a maximum.
The celestial equator is none other than the Earth's equator projected out into space, and the north and south celestial poles are simply our own poles projected out indefinitely. Where the Sun crosses the celestial equator both right ascension and declination are zero. Declination is similar to latitude on Earth, measuring a north-south bearing.
Objects above the celestial equator have a positive declination, objects below it a negative declination. The track of the Sun across the sky is known as the ecliptic. The First Point of Aries should now be in the middle of your view.
The right ascension and declination of celestial objects do not change, unless the position of the objects changes relative to the coordinate system which of course they do, but very slowly, so slowly that it is only necessary to revise the coordinate system every 50 years.
Each time a coordinate system is fixed, it is called an epoch. The current epoch, and the only one supported in WorldWide Telescope, is the J epoch - namely the position of the celestial objects and coordinate system at Noon on January 1st in the yearat the Royal Observatory, Greenwich, England.
The change to the J epoch was made inas the positions of stars can be predicted accurately in advance of the actual year. There may of course be a change to the J epoch, perhaps sometime after the year Of course stars and all other objects do appear to move in the sky, as a result of the rotation and orbit of the Earth.
At any one moment the position of an object in the sky can be referenced by its azimuth and altitude. Azimuth is similar to longitude or right ascension, in that it is an east-west bearing from true north.
Altitude is an angle rather than a distance, it is the angle up or down from the horizon. By convention positive azimuth is to the east, negative to the west, and positive altitude is up from the horizon.
Unlike right ascension and declination, azimuth and altitude change continuously. For example, open the Search panel, then enter Sirius in the search text box.
When the bright star Sirius appears, zoom away from it until the view is from Earth that is, minimize the zoom completely.
Right-click on Sirius in the sky to bring up the Finder Scope. Note that the seconds values for the Altitude Alt and Azimuth Az of Sirius are changing, even when you look at the star in real time. The altitude and azimuth will now change quite quickly. Altitude and azimuth are very useful values when aligning a physical telescope from Earth to locate a particular star or planet.
The values are different for every view point on Earth, hence the usefulness of right ascension and declination as a fixed coordinate system. The Magnitude entry on the Finder Scope refers to the apparent magnitude of the brightness of Sirius.
For a description of what this means refer to the Stellar Brightness section, or work through the Tutorial: Visiting the Neighbors tutorial. The Distance entry on the Finder Scope is the distance to the object in light years. A light year is an enormous distance. The speed of light in a vacuum is ,Accounting.
The Accounting program provides students with the theories and procedures necessary to prepare them for the many facets of the accounting profession, such as public, industrial, managerial, tax and government accounting.
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