While the moon has four primary phases each month ... This means that one lunar rotation on its axis corresponds to the time of revolution around Earth, equal to 29.5 days. On a daily basis ...

A lunar month is the period of time from one new moon to the next — about 29.5 days — so the lunar calendar doesn't precisely align with the common one where most months span 30 or 31 days.

Lunar New Year starts this week, marking an important holiday in China and other Asian communities. Lunar New Year celebrations can last up to 15 days, starting on the new moon between late ...