Mittal Institute of Technology & Science, Pilani

Department of Instrumentation

Astronomical Measurements

http://en.wikipedia.org/wiki/Astronomical_unit

http://neo.jpl.nasa.gov/glossary/au.html

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980122b.html

http://www.iau.org/public/measuring/  International Astronomical Union