OBSERVING VARIABLE STAR
Not all stars shine with a steady, invariable light. Many fluctuate in brightness over periods ranging from minutes to years
Astronomers have listed some 30,000 variable stars of many different types and brightnesses. By observing these stars, amateurs can significantly contribute to the science of astronomy.
To begin observing variable stars, you need a telescope or binoculars, a list of variables noting their magnitude ranges and periods, and star charts showing their locations.