Changes

==History==

==History==

Sirius A was known throughout human history and was referred to ''Sopdet'' by the ancient Egyptians.  The [[Middle Kingdom]] of Egypt even based their calendar on the first day Sirius would become visible right before sunrise, to indicate the coming annual flooding of the Nile<ref>http://books.google.com/books?id=qUk0GyDJRCoC&pg=PP1&dq=isbn=0306466120&sig=wDa9MW9Qy5f3BIvPvbDLc_LMnJE#PPA500,M1</ref>. The [[ancient Greek]] name for Sirius was Σείριος ''Seirios'', which was derived from σείριος, meaning scorching or destructive. It was seen as a as a herald that forewarned of a hot and dry summer ahead.<ref>http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Canis_Major*.html</ref>   

Sirius A was known throughout human history and was referred to ''Sopdet'' by the ancient Egyptians.  The [[Middle Kingdom]] of Egypt even based its calendar on the first day Sirius would become visible right before sunrise, to indicate the coming annual flooding of the Nile<ref>http://books.google.com/books?id=qUk0GyDJRCoC&pg=PP1&dq=isbn=0306466120&sig=wDa9MW9Qy5f3BIvPvbDLc_LMnJE#PPA500,M1</ref>. The [[ancient Greek]] name for Sirius was Σείριος ''Seirios'', which was derived from σείριος, meaning scorching or destructive. It was seen as a as a herald that forewarned of a hot and dry summer ahead.<ref>http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Canis_Major*.html</ref>   

[[Ptolemy]] was the first to actually map the star in the sky, recorded in the ''Almagest'', or Great Book.  In 1833-34, [[Friedrich Wilhelm Bessel]], concluded that Sirius must have a companion after studying the motions of the star.  The first observable evidence of a companion star didn't occur though until 1862, when '''Alvan Graham Clark''' found Sirius B at the Dearborn Observatory. In 1915, using the [[Mount Wilson Observatory]], '''Walter Sydney Adams''' was the first to discover it as a white dwarf<ref>http://adsabs.harvard.edu/abs/1915PASP...27..236A</ref>.  Although the companion was first measured in 1959, it wasn't until 2005, using the [[Hubble Space Telescope]], was an accurate measurement calculated.

[[Ptolemy]] was the first to actually map the star in the sky, recorded in the ''Almagest'', or Great Book.  In 1833-34, [[Friedrich Wilhelm Bessel]], concluded that Sirius must have a companion after studying the motions of the star.  The first observable evidence of a companion star didn't occur though until 1862, when '''Alvan Graham Clark''' found Sirius B at the Dearborn Observatory. In 1915, using the [[Mount Wilson Observatory]], '''Walter Sydney Adams''' was the first to discover it as a white dwarf<ref>http://adsabs.harvard.edu/abs/1915PASP...27..236A</ref>.  Although the companion was first measured in 1959, it wasn't until 2005, using the [[Hubble Space Telescope]], was an accurate measurement calculated.