Solar astronomy is stellar astronomy of the sun

Sun

The Sun is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields...

.

• Timeline of solar astronomy
  Timeline of solar astronomy
  -9th century:* 850 — Ahmad ibn Muhammad ibn Kathīr al-Farghānī gives values for the obliquity of the ecliptic, the precessional movement of the apogees of the Sun-10th century:...
  
  
• Solar telescopes
• List of solar telescopes
• Coronagraph
  Coronagraph
  A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects – which otherwise would be hidden in the star's bright glare – can be resolved...
  
  
• Helioseismology
  Helioseismology
  Helioseismology is the study of the propagation of wave oscillations, particularly acoustic pressure waves, in the Sun. Unlike seismic waves on Earth, solar waves have practically no shear component . Solar pressure waves are believed to be generated by the turbulence in the convection zone near...
  
  

Sun size relative to its distance from Proxima Centauri

The diameter of the Sun is about 1,390,000 km, and its nearest neighboring star, Proxima Centauri, is 4.22 light years (3.99 x 10¹³ km) away. Therefore, the ratio of distance to diameter is 28,700,000 : 1, so if the Sun were one centimeter in diameter, Proxima Centauri would be 287 km away.

External links

• http://www.cv.nrao.edu/fits/www/yp_solar.html
• http://sdo.gsfc.nasa.gov/ Solar Dynamics Observatory