The assembly meetings did not occur at fixed intervals, as they had to avoid clashing with the annual festivals that followed the lunar calendar.

The Thai zodiac includes a Naga in place of the Dragon and begins, not at Chinese New Year, but at either on the first day of fifth month in Thai lunar calendar, or during the Songkran festival ( now celebrated every 13 – 15 April ), depending on the purpose of the use.

Early evidence of such practices appears as markings on bones and cave walls, which show that lunar cycles were being noted as early as 25, 000 years ago ; the first step towards recording the Moon ’ s influence upon tides and rivers, and towards organizing a communal calendar.

* A lunar calendar is synchronized to the motion of the Moon ( lunar phases ); an example is the Islamic calendar.

* A " luni-solar calendar " is based on a combination of both solar and lunar reckonings ; examples are the traditional calendar of China, the Hindu Calendar in India or the Hebrew calendar.

Because the length of the lunar month is not an even fraction of the length of the tropical year, a purely lunar calendar quickly drifts against the seasons, which don't vary much near the equator.

Alexander Marshack, in a controversial reading, believed that marks on a bone baton ( c. 25, 000 BC ) represented a lunar calendar.

Similarly, Michael Rappenglueck believes that marks on a 15, 000-year old cave painting represent a lunar calendar.

A lunisolar calendar is a lunar calendar that compensates by adding an extra month as needed to realign the months with the seasons.

In a lunar calendar, the month approximates the cycle of the moon phase.

The same applies to months in a lunar calendar and also the number of months in a year in a lunisolar calendar.

Even if a calendar is solar, but not lunar, the year cannot be divided entirely into months that never vary in length.

The Islamic calendar or Muslim calendar or Hijri calendar is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.

The measured brightness temperature is a good approximation to the brightness temperature at the center of the lunar disk because of the narrow antenna beam and because the temperature distribution over the central portion of the moon's disk is nearly uniform.

The south tides in the Atlantic Ocean are semi-diurnal ; that is, two high tides occur during each 24 lunar hours.

* 1958 – Pioneer 0, America's first attempt at lunar orbit, is launched using the first Thor-Able rocket and fails.

Geologists believed prior to the mission that both of these formations were volcanic in origin ; however, samples returned from the lunar surface have since proven this hypothesis is incorrect.

The insignia of Apollo 16 is dominated by rendering of an American eagle and a red, white and blue shield, representing the people of the United States, overlaying a gray background, the lunar surface.

Oh, that first foot on the lunar surface is super, Tony!

It is based on cycles of years, lunar months, and two-hour periods of the day ( the shichen ).

The parallax angle is given in the box to the right, and the angular diameter is known from lunar occultation measurements ( 41. 3 ± 0. 1 mas ).

Antares B can be observed with a small telescope for a few seconds during lunar occultations while Antares itself is hidden by the Moon ; it was discovered by Johann Tobias Bürg during one such occultation on April 13, 1819.

* Balboa ( lunar crater ), a lunar crater that is located near the western limb of the Moon

* The week cycle is an example of one that is not synchronized to any external phenomenon ( although it may have been derived from lunar phases, beginning anew every month ).

While the Mercury capsule could only support one astronaut on a limited Earth orbital mission, the Apollo spacecraft was to be able to carry three astronauts on a circumlunar flight and eventually to a lunar landing.

Apollo 16 would spend one less day in lunar orbit after surface exploration had been completed to afford the crew contingency time to compensate for any further problems and to conserve expendables.

The 28 lunar mansions are one of the most important and also the most ancient structures in the Chinese sky, attested from the 5th century BC.

The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day ; the lunar month ; and the year.

They performed 10 lunar orbits and broadcast live TV pictures that became the famous Christmas Eve Broadcast, one of the most watched programs in history.

The importance of 12 has been attributed to the number of lunar cycles in a year, and also to the fact that humans have 12 finger bones ( phalanges ) on one hand ( three on each of four fingers ).

Because of the roughly eleven-day difference between twelve lunar months and one solar year, the length of the Hebrew calendar year varies in the repeating 19-year Metonic cycle of 235 lunar months, with the intercalary month added according to defined rules every two or three years, for a total of 7 times per 19 years.

The abundance of helium-3 is thought to be greater on the Moon ( embedded in the upper layer of regolith by the solar wind over billions of years ), though still low in quantity ( 28 ppm of lunar regolith is helium-4 and from one ppb to 50 ppb is helium-3 )< ref name =" F. H. Cocks 2010 ">, and the solar system's gas giants ( left over from the original solar nebula ).

The Universal Jewish Encyclopedia advanced a theory of Assyriologists like Friedrich Delitzsch ( and of Marcello Craveri ), that shabbat originally arose from the lunar cycle in the Babylonian calendar containing four weeks ending in Sabbath, plus one or two additional unreckoned days per month.

The LRV was transported to the Moon on the Apollo Lunar Module ( LM ) and, once unpacked on the surface, could carry one or two astronauts, their equipment, and lunar samples.

In early planning for the Apollo Program, it had been assumed that two Saturn V launch vehicles would be used for each lunar mission: one for sending the crew aboard a Lunar Surface Module ( LSM ) to lunar orbit, landing, and returning, and a second for sending an LSM-Truck ( LSM-T ) with all of the equipment, supplies, and transport vehicle for use by the crew while on the surface.

Likewise, during every full moon one might expect the Earth's shadow to fall on the Moon, causing a lunar eclipse.

The Universal Jewish Encyclopedia advanced a theory of Assyriologists like Friedrich Delitzsch ( and of Marcello Craveri ), that shabbat originally arose from the lunar cycle in the Babylonian calendar containing four weeks ending in Sabbath, plus one or two additional unreckoned days per month.

For lunar materials, one well-studied possibility is to build mass drivers to launch bulk materials to waiting settlements.

Zakat is only payable on assets continuously owned over one lunar year that are in excess of the nisab, a minimum monetary value.

In addition to documenting about 2, 500 stars in his extensive star catalogue, Zhang also posited theories about the Moon and its relationship to the Sun ; specifically, he discussed the Moon's sphericity, its illumination by reflecting sunlight on one side and remaining dark on the other, and the nature of solar and lunar eclipses.

The reform had by then received some modifications in points of detail by the reform commission, in which one of the leading members was Clavius, who afterwards wrote defences and an explanation of the reformed calendar, including an emphatic acknowledgement of Lilio's work, especially for his provision of a useful reform for the lunar cycle: " We owe much gratitude and praise to Luigi Giglio who contrived such an ingenious Cycle of Epacts which, inserted in the calendar, always shows the new moon and so can be easily adapted to any length of the year, if only at the right moments the due adjustment is applied.

It covered an area of one hectare ( 120 meters by 70 meters ) and was very similar to some parts of the lunar surface.

The ordering of these series is determined by the time at which each series peaks, which corresponds to when an eclipse is closest to one of the lunar nodes.