5 Lessons Easy

About this course

This is a free , easy course of five lessons covering astronomy fundamentals for website visitors. Each lesson ends with a short quiz to test your knowledge. 

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Course Structure

Light Pollution

Learn everything in this lesson about the bane of astronomers - Light Pollution

Skywatching From Towns & Cities

Town and city-bound skywatchers have difficulty seeing the stars because of artificial lighting that switches on when the Sun goes down. However, the nighttime environment, especially in the suburbs, can be improved if local authorities and businesses adopt astronomy-friendly lighting technologies. For instance, modern street lighting that sends zero light skyward is now a reality. 

Find out more about doing astronomy from urban areas in this lesson.

The Celestial Sphere

Looking up at the night sky you get the feeling that you are underneath a vast dome with all the stars seemingly at the same distance away, rising and setting, stuck to the inside of that dome – the celestial sphere – an imaginary spherical shell around the Earth to which the stars are stuck the stars. Find out everything an astronomer needs to know about it in this lesson.


The magnitude of a celestial object is a number denoting its brightness. The higher the magnitude value, the fainter the object. There are five scales of magnitude. Find out everything in this lesson.

The Constellations – Introduction

A constellation is a grouping of stars forming an imaginary outline representing an animal, a mythological character, or, especially in the southern hemisphere, a navigational object. This lesson is a short historical introduction to the star patterns in the night sky.