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- It was used by him in his earliest observations of double stars (1779-1783); but, even in his hands, the measurements were comparatively crude, because of the difficulties he had to encounter from the want of a
**parallactic**mounting. - Doubt was first thrown on the accuracy of this number by an announcement from Hansen in 1862 that the observed
**parallactic**inequality of the moon was irreconcilable with the accepted value of the solar parallax, and indicated the much larger value 8.97". - The fourth method is through the
**parallactic**inequality in the moon's motion. - The determination of the solar parallax through the
**parallactic**inequality of the moon's motion also involves two elements - one of observation, the other of purely mathematical theory. - The theoretical element is the ratio of the
**parallactic**inequality to the solar parallax.

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