Articles to help you discover the wonders of the Universe

Astronomy is an infinitely captivating subject and the oldest of the natural sciences. It is one of the few areas of science that amateurs can assist professionals and directly contribute to science. Astronomy is the scientific study of the contents of entire Universe, stars, planets, comets, asteroids, galaxies, and space and time, as well as its history.

If you’re starting out in Astronomy and looking at the sky at night, the contents of this site will guide you through what you can see at night as well as equipment advice, observation tips and tutorials. The astronomy articles cover the types of objects you can see and illustrate some basic astronomy concepts which are important to learn. You can also find several astronomy DIY projects which you can build yourself.


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In astronomy, luminosity is the total amount of energy radiated by a star, galaxy, or another astronomical object per unit time. It is related to the brightness, which is the luminosity of an object in a given spectral region. In SI units luminosity is measured in joules per second or watts.
Luminosity and Flux of Stars


Scientists discovered a supermassive black hole at the center of the Milky Way, contradicting their chewy caramel center theory.
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.
The Astronomical Magnitude Scale


Sidereal time is a timekeeping system that astronomers use to locate celestial objects. Using sidereal time it is possible to easily point a telescope to the proper coordinates in the night sky.
Sidereal Time, Civil Time and Solar Time


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.
What is Angular Size?


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.
Parallax, Distance and Parsecs


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.
The Celestial Sphere - Right Ascension and Declination


In 1609, a German mathematician by the name of Johannes Kepler discovered a simple relationship between the distance from the Sun and a planet's orbital period. This relationship became the foundation for Kepler's laws of planetary motion.
Kepler's Laws of Planetary Motion


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