...He measured the obliquity of the ecliptic, and agreed withEratosthenes... 
George Forbes 「History of Astronomy」
...] He determined the plane of the moon’s orbit andits inclination to the ecliptic...
George Forbes 「History of Astronomy」
...By this third motion the earth, he held,made a revolution on itself and on the poles of the ecliptic once a year ...
George Forbes 「History of Astronomy」
...In 1787 Herschel discovered two satellites, both revolving in nearly the sameplane, inclined 80° to the ecliptic, and the motion of both wasretrograde...
George Forbes 「History of Astronomy」
...But the comet crossedthe ecliptic (the plane in which the earth travels round the sun)between the epochs named, crossing it at a great angle...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...The great path of the Sun among the constellations as seen from theEarth is called the Ecliptic...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...It hence follows that Uranus is at all times only to be metwith along the ecliptic, and it is possible to calculate where theplanet has been in each year...
Robert Stawell Ball 「The Story of the Heavens」
...As the earth travelsin its annual path around the sun, the axis of the earth is directed toa point in the heavens which is 23-⁄° from the pole of the ecliptic...
Robert Stawell Ball 「The Story of the Heavens」
...We thussee that the pole of the moon's orbit must be actually revolving aroundthe pole of the ecliptic, always remaining at the same distance of 5°,and completing its revolution in 18-⁄ years...
Robert Stawell Ball 「The Story of the Heavens」
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