Astronomy compels the soul to look upwards and leads us from this world to another.

Astronomy

Learn the basics of astronomy with historical background and an introduction to the basic astronomy concepts, details about planets, satellites, asteroids, comets and meteors. Also learn the history of Astronomy from its origins in the religious, mythological, and astrological practices of prehistory through to modern astronomy.

 

How do they Calculate Distances to the Stars?
5th November 2008Astronomy
Distance is usually measured with a ruler, measuring tape or a wheel. All these techniques rely on us being able to physically measure the distance between two points, but for stars and planets, this isn't very practical. Instead of measuring, astronomers have to calculate these values and they do this using a variety of methods.
Equinoxes and Solstices
5th November 2008Astronomy
An equinox is a moment in which the plane of Earth's equator passes through the centre of the Sun, a time when both hemispheres of the Earth are illuminated equally and day and night are the same lengths.
Apparent Magnitude, Absolute Magnitude and Distance
22nd April 2008Astronomy
The apparent magnitude and absolute magnitude are two ways of comparing an object's brightness. In this example, we look at the relationship between absolute magnitude, apparent magnitude and luminosity.
The Magnitude Scale
21st April 2008Astronomy
The visual brightness of stars, planets and other astronomical objects is based on the visual magnitude scale. We look at this scale and how astronomers use it to measure relative brightnesses of objects in the night's sky.
Sidereal Time, Civil Time and Solar Time
17th April 2008Astronomy
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?
17th April 2008Astronomy
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.
Parallax, Distance and Parsecs
17th April 2008Astronomy
In Astronomy, 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 - Right Ascension and Declination
4th April 2008Astronomy
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 Celestial Sphere, the ecliptic and how to locate objects using Right Ascension and Declination.