solar parallax


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Noun1.solar parallax - the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit
diurnal parallax, geocentric parallax - the parallax of a celestial body using two points on the surface of the earth as the earth rotates
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"It is disconcerting that these [new figures] and other solar parallax determinations, all based on immense labor, should differ by amounts considerably greater than the stated uncertainties....
``He calculated the distance of the Earth from the Sun by observing the solar parallax. He worked out a detailed theory of the Moon's motion and realised that planets exerted forces on each other.
While the angle of the ecliptic (the apparent annual path of the sun) was one of the primary objectives of measurements at the meridian lines, the measurements were also useful in calculating the size of the sun and the shape of the earth and in correcting for atmospheric refraction and solar parallax. Heilbron describes in detail the construction and uses of the lines and always sets the lives and engineering skills of the astronomers who build them in the context of their ecclesiastic and national political situations.