lunar day


Also found in: Dictionary, Thesaurus, Wikipedia.

lunar day

The rotation period (27.322 Earth days) of the Moon, equal in length to the sidereal month. The Moon is thus in synchronous rotation with the Earth. See also libration.

lunar day

[′lü·nər ′dā]
(astronomy)
The time interval between two successive crossings of the meridian by the moon.
References in periodicals archive ?
There are 30 lunar days (cumulative 12-degree angular separations of the Sun and Moon) starting from the New Moon (considered the 30th day), counting through the waxing half of the Moon cycle to the Full Moon (start of of the 15th day) and on around through the waning cycle, back to the New Moon again.
For that purpose, we sought axes for the between-group analysis that would best discriminate the centers of gravity of each lunar day and allow us to investigate associations between lunar phases and the variability of CPUE for each species.
Described thus: 'A recapitulation of the changing appearances during the lunar day of the region embracing the mountains designated M1-M5 which are all contained within the south polar circle down to 84[degrees] latitude.
The first thing to notice about the lunar landscape is that it's divided by the terminator, the line between lunar day and night.
Powered by the waves,different parts of the artwork light up according to the phases of the moon and will also display the lunar day and the tidal changes.
They are bathed in sunlight for 85 percent of the lunar day and therefore offer a location particularly rich in solar energy, which could be used to power equipment.
11) To say that "nothing in the sources contradicts the surmise" that the intention of ancient Jewish calendrical practice was that the appearance of the first crescent should occur after the daylight of lunar day 1 (ibid.
Since the moon has no atmosphere of its own, there are large differences of temperature between the lunar day and night, more extreme than the hottest and the coldest places on Earth.
For one lunar day - two weeks on Earth - The crew would teleoperate any number of small rover vehicles dispatched to the farside.
The first thing you'll notice about the lunar landscape is that it's divided by the terminator, the line between lunar day and night.
I was particularly interested in seeing how accurately Lunar Discoverer's map and its display of the terminator marking the division between lunar day and night compared with the real thing in the sky.