celestial longitude


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Synonyms for celestial longitude

(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky

References in periodicals archive ?
This ornamental metal armillary in a silver nickel plated finish has a spherical framework of rings, centred on Earth, and represent lines of celestial longitude and latitude.
Astronomically, the Moon is new when it and the Sun have the same celestial longitude.
The instant of new Moon occurs when our satellite's celestial longitude (along the ecliptic) matches that of the Sun, and its date and time are given to the nearest minute in each issue of this magazine (see page 95).
He also reported that the gegenschein's center sometimes lags behind the antisolar point in celestial longitude.
Taking both visual and radio data into account, they find that the peak probably occurred near 12h UT on June 27, 1998, when the Sun's celestial longitude was 95.
Today we usually mark the beginning of the seasons when the Sun's celestial longitude passes 0u (spring), 90u (summer), 180u (autumn), and 270u (winter).