Tonight in lab we practiced plotting stars on a chart using Right Ascension and Declination. RA is the equilivant of longitude and is measured in seconds, minutes, and hours. Declination is measured in degrees (both positive and negative starting at the celestial equator) and is the equilivant of latitude on Earth. This system was invented by the Ancient Greek astonomer Hipparchus (who I'm researching this semester).
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