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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

Vernal Equinox A celestial starting point March 19, 2016

Celestial Equator Splitting the night sky in half January 30, 2015

Aries Moving the point of the vernal equinox October 26, 2012

Celestial Equator Splitting the sky in half October 14, 2012

Celestial Equator An astronomical "Mason-Dixon Line"... June 18, 2011

Lunar Guidance Following a guiding star February 12, 2011