As billions of people worldwide celebrate the Lunar New Year, astronauts aboard China's Tiangong space station sent home a holiday greeting.

Jan. 28 marks the Lunar New Year, beginning the Year of the Snake. It's not the only lunar festival — Ramadan begins Feb. 28, Passover on April 12 and Easter on April 20.

how long it lasts and what to know about the first full moon of January. No. Chinese New Year, also known as Lunar New Year because it is based on the Chinese lunar calendar, changes with the moon ...