Celestial Coordinates

Astronomers measure the positions of astronomical objects using coordinates called right ascension and declination -- the equivalent of longitude and latitude here on Earth. If you're standing on Earth's equator, the celestial equator stretches from east to west directly across the top of the sky, dividing the sky into northern and southern hemispheres.

Radio Programs

Aries Moving the point of the vernal equinox Saturday, October 27, 2012
Celestial Equator Splitting the sky in half Monday, October 15, 2012
Celestial Equator An astronomical "Mason-Dixon Line" Sunday, June 19, 2011
Lunar Guidance Following a guiding star Sunday, February 13, 2011
A Star to Steer Her By A trip to Asia via the stars Monday, November 22, 2010
Celestial Equator Marking off the night sky Saturday, April 25, 2009
Vernal Equinox "Zeroing out" the cosmos Friday, March 20, 2009

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