semidiameter


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Related to semidiameter: parallax

semidiameter

(sem-ee-dÿ-am -ĕ-ter) Half the apparent diameter of a celestial body.

semidiameter

[¦sem·i·dī′am·əd·ər]
(astronomy)
Measured at the observer, half the angle subtended by the visible disk of a celestial body.
References in periodicals archive ?
The altitude is given as 3[degrees], to which the semidiameter of 16' must be added to obtain the altitude of the sun's centre.
The semidiameters of capacitive arcs of the steel electrodes coated with FBC coatings are greater than HYC coatings.
* Nanotechnology--RS provides determination of nanocrystal, chirality, semidiameters in nanomaterials.
Among its features was a gem of an introduction in which Dee makes the startling observation that "the distance of the starrie skie is from us, in Semidiameters of the Earth 20081 1/2.