Algol is an "eclipsing binary", meaning there are two stars, one of which regularly covers the other. When that happens, we receive less light from the pair.
(ALGOrithmic Language) A high-level compiler language that was developed as an international language for the expression of algorithms between people and between people and machines. ALGOL-60 (1960)...
the brightness of an object is the amount of light it reflects, the more it reflects the brighter it will be. Or the object could be giving out light, a vehicle head light for example
The apparent brightness of a star is how bright it appears to your eyes. The absolute brightness of a star is a measure of how much light it produces. The absolute brightness of a star is a measure...