mrt 272012
 
Space Observations of Mercury Transits Yield Precise Solar Radius

A group of scientists from Hawaii, Brazil and California has measured the diameter of the Sun with unprecedented accuracy by using a spacecraft to time the transits of the planet Mercury across the face of the Sun in 2003 and 2006.   Mercury’s path across the solar disk as seen from SOHO on November 8, 2006. [continue reading]