FREE YOUR MIND

Gallery

“The Demon Star” –Cairo Calendar Shows Egyptians Discovered the Binary Algol 3200 Years Ago

by dailygalaxy.com

Algol in Perseus image Wikimedia

Algol, aka the Demon Star, is actually a binary star in the Perseus constellation, and has been discovered by a group of Finnish researchers to be  first noted by the Egyptians some 3200 years ago. It is one of the best known eclipsing binaries, the first such star to be discovered, and also one of the first (non-nova) variable stars to be discovered.

The eclipses in binary stars give precise information of orbital period changes. Alogl brightens and dims every 2.867 days, a phenomenon first described in semi-modern western astronomy by John Goodricke, who wrote about what he saw with the naked eye back in 1783.  The irregular orbital period changes of this longest known eclipsing binary continues to puzzle astronomers. The mass transfer between the two members of this binary should cause a long-term increase of the orbital period, but observations over two centuries have not confirmed this effect.

Read more here

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s