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Tanabata is a Japanese star festival, derived from the Chinese star festival, Qi Xi.

It celebrates the meeting of Orihime (Vega) and Hikoboshi (Altair). The Milky Way, a river made from stars that crosses the sky, separates these lovers, and they are allowed to meet only once a year on the seventh day of the seventh lunar month of the lunisolar calendar. Since the stars come out at night, the celebration is held at night.

• http://en.wikipedia.org/wiki/Tanabata