Definition of celestial longitude in English:

celestial longitude

Pronunciation /səˈlesCHəl/ /səˈlɛstʃəl/ /səˈlesˌdēəl ˈlänjiˌt(y)o͞od/ /səˈlɛsˌdiəl ˈlɑndʒɪˌt(j)ud/ /ˈlônjiˌt(y)o͞od/ /ˈlɔndʒɪˌt(j)ud/

noun

Astronomy
  • The angular distance of a point east of the vernal equinox, measured along the ecliptic.

    Compare with right ascension

    ‘But in fact, from day to day the earthbound observer does see the midday Sun at a different point along the same celestial longitude - up or down relative to the horizon.’
    • ‘By the time he returned home in January 1678, he had recorded the celestial longitudes and latitudes of 341 stars and observed a transit of Mercury across the Sun's disk.’
    • ‘Technically, a conjunction describes a precise alignment of heavenly bodies that happen to have the same celestial longitude - that is, they appear to line up in the sky, one directly above the other.’
    • ‘The Moon's motion along the ecliptic is measured in degrees and minutes of celestial longitude, but its orbit does not align exactly with the ecliptic.’
    • ‘In this case, Mayan astronomers apparently focused on two cycles related to the number of days that elapse between consecutive passages of Mars through a given celestial longitude while traveling across the sky.’