More on obliquity of the ecliptic from Infoplease:

• inclination - inclination inclination, in astronomy, the angle of intersection between two planes, one of which ...
• obliquity: meaning and definitions - obliquity: Definition and Pronunciation
• ecliptic - ecliptic ecliptic , the great circle on the celestial sphere that lies in the plane of the ...
• Al-Battani - Al-Battani Al-Battani or Albatenius, b. before 858, d. 929, Arab astronomer and mathematician. He ...
• Astronomical Constants - Astronomical Constants Light-year (distance traveled by light in one year) 5,880,000,000,000 mi ...

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