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Astronomy Basics

Learn the basics of astronomy with historical background and an introduction to the basic astronomy concepts, details about planets, satellites, asteroids, comets and meteors.

Sidereal Time, Civil Time and Solar Time
17/04/2008Astronomy Basics
There are several different systems for measuring Time. Civil time is the system we are all familiar with, however astronomers use a different system - sidereal time which is measured with reference to background stars in the sky, as opposed to the Sun.
What is Angular Size?
17/04/2008Astronomy Basics
You may have heard the terms arc-minute and arc-second mentioned on the TV, magazines or other websites. These are the units of measurement for angular size used in modern astronomy. Angular size is used to describe the dimensions of an object as it appears in the sky.
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Parallax, Distance and Parsecs
17/04/2008Astronomy Basics
Parallax is a method used to determine the distance to the closest stars. This technique for measuring astronomical distances is very important because it is a geometric method and independent of the object being observed.
The Celestial Sphere
04/04/2008Astronomy Basics
The most fundamental property that any astronomer needs to know is our place in the heavens and the position of astronomical objects that lie on the surface of the celestial sphere. We will look at the ecliptic and how to locate objects using Right Ascension and Declination.