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WikiPedia: Trăng_xanh http://www.uranometrianova.pro.br/astronomia/AA001... http://www.inconstantmoon.com/cyc_blue.htm http://www.infoplease.com/spot/bluemoon1.html http://www.msnbc.msn.com/id/18869948/ http://www.netaxs.com/~mhmyers/blue/blue.html http://www.obliquity.com/astro/blue-st.html http://www.obliquity.com/cgi-bin/bluemoon.cgi http://www.panic.com/blog/2009/12/on-calendars/ http://skyandtelescope.com/observing/objects/moon/... http://www.skyandtelescope.com/observing/objects/m...