Evection sentence examples

evection
  • EVECTION (Latin for "carrying away"), in astronomy, the largest inequality produced by the action of the sun in the monthly revolution of the moon around the earth.

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  • The eccentricity determined in this way is more than a degree in error, owing to the effect of the evection, which was unknown to Hipparchus.

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  • It was thus found by Ptolemy that an additional inequality existed in the motion, which is now known as the evection.

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  • If we put g for the moon's anomaly or distance from the perigee, and D for its elongation from the sun, the inequalities in question as now known are 6.29° sin g (equation of centre) +1.27° sin (2D-g) (evection).

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  • Hence the evection is then - 1.2° sin g, and consequently has the same argument g as the equation of centre, so that it is confounded with it.

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  • equation of the centre and evection are, at quadrature 6.29° sin g+I 27° sin g= 7.56° sin g.

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  • Thus, in consequence of the evection, the equation of the centre comes out 2° 30' larger from observations at the moon's quarters than during eclipses.

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  • If we put g for the moon's anomaly or distance from the perigee, and D for its elongation from the sun, the inequalities in question as now known are 6.29° sin g (equation of centre) +1.27° sin (2D-g) (evection).

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  • Hence the evection is then - 1.2° sin g, and consequently has the same argument g as the equation of centre, so that it is confounded with it.

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  • equation of the centre and evection are, at quadrature 6.29° sin g+I 27° sin g= 7.56° sin g.

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  • Thus, in consequence of the evection, the equation of the centre comes out 2° 30' larger from observations at the moon's quarters than during eclipses.

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