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Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

This complete lunar cycle (New Moon to New Moon) is also called a lunation. During this time the moon will completely circle the earth. That's the scientific definition, but you can take any phase; for instance a so-called full moon cycle would be from Full Moon to Full Moon. The calendar used earlier will appear, but on the right-hand side students can "Go to Lunar Cycle" where they can see images of a full lunar cycle and images of the main phases. You can choose to either have students use the esheet at the two-week point or wait until students have completed a full calendar. Hence the term golden number, still found in our almanacs, which denotes the year of the lunar cycle. Letters on Astronomy Denison Olmsted Thus, fourteen was the golden number for 1837, being the fourteenth year of the lunar cycle. Synodic months are 29 or 30 days in length, making a lunar year of 12 months about 11 days shorter than a solar year. Some lunar calendars do not use intercalation, such as most Islamic calendars. For those that do, such as the Hebrew calendar, the most common form of intercalation is to add an additional month every second or third year. A full lunar cycle lasts almost a month (about 29.5 days), and during that time the moon goes from new to crescent to first quarter to gibbous to full to gibbous to third quarter to crescent and back to new. However, a full moon, a new moon, ... To help students recognize that the moon looks a little different every day, but looks the same again about every four weeks, have them use the Moon Phases student esheet to go to the Lunar Cycle Calendar website. The New Moon is highest in the sky to an earthbound observer at (noon, sunset, midnight, sunrise). The Full Moon is highest in the sky to an earthbound observer at (noon, sunset, midnight, sunrise). Throughout the Lunar Cycle, the Moon will appear further (eastward, westward) in the sky at the same time each day. Therefore, to an earthbound observer, the time of day when the Moon is highest in the sky becomes progressively (earlier, later). However, misconceptions regarding the Moon's apparent change in shape still abound. Some believe that clouds or some other object cover up the Moon, blocking our view of part of it. This may happen, but it is not the mechanism behind the lunar cycle. Others believe that the shadow of Earth or some other object falls on the Moon's surface, causing the phases of the Moon. While the Moon does occasionally cross Earth's shadow, resulting in a lunar eclipse, shadows cast by Earth are not what cause lunar phases. Therefore, although mean Earth orbital eccentricity has a well-known effect on the short-term periodic variation of the length of the lunar cycle (find the word eccentricity on this page), it doesn't plausibly account for its long-term secular variation. In purely lunar calendars like the Islamic calendar, the lack of intercalation causes the lunar months to cycle through all the seasons of the Gregorian year over the course of a 33 lunar-year cycle. Query: how long is lunar cycle
Output:
A full lunar cycle lasts almost a month about 29.5 days.