Greenwich lunar time

Greenwich lunar time

[′gren·ich ′lün·ər ¦tīm]
(astronomy)
Local lunar time at the Greenwich meridian; the arc of the celestial equator, or the angle at the celestial pole, between the lower branch of the Greenwich celestial meridian and the hour circle of the moon, measured westward from the lower branch of the Greenwich celestial meridian through 24 hours.
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