This year is a xinhai year (in the sexagenary cycle).
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history
辛亥 most often refers to 1911, the year Sun Yat-sen's revolution (辛亥革命 Xīnhài Gémìng) ended over 2,000 years of imperial rule and founded the Republic of China.
culture
Each year in the traditional Chinese calendar pairs one of 10 Heavenly Stems (天干) with one of 12 Earthly Branches (地支), making a 60-year cycle. 辛亥 = 辛 (8th stem) + 亥 (12th branch, the Pig).