March 2015
S M T W T F S
« Feb    
1234567
891011121314
15161718192021
22232425262728
293031  
News for Norther Colorado and the world

Monday, March 30, 2015

Posts Tagged ‘casiopeia’

EarthSky Tonight—Oct. 30, As Halloween approaches,

EarthSky Tonight—Oct. 30, As Halloween approaches, find the Ghoul Star of Perseus

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org As Halloween approaches, try looking for the star Beta Persei, otherwise known as Algol in the constellation Perseus. This star’s proper name comes from the Arabic for head of the ghoul, or head of the demon. This star is known to vary in brightness over a regular time interval. The cycle lasts exactly 2 days, 20 hours and 49 minutes. All the while, the star remains visible to the eye. Algol’s brightness variations are ... Full Story

Page 1 of 11