Where is the “devil’s star” in the sky?

“Devil’s Star” – Algol (and Perseus), this is eclipsing – a variable star. It changes brightness by a factor of 3 due to the coverage of a hot star by a colder one with a period of about 3 days. “El Ghul” in Arabic means the devil.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.