blue moon
noun[C]
environmentspecialized(alsoBlue Moon)uk/ˌbluː ˈmuːn/us/ˌbluː ˈmuːn/the secondfullmoon(= thetimewhen themoonisshapedlike acompletedisc)in amonth, thatappearsaround every two and ahalfyears:
（每两年半出现一次的）蓝月亮，一个月中的第二个满月How often does a Blue Moonoccur, and when will there be another?蓝月亮多久会出现一次，下次什么时候？
Abluemoondoesn'tlookblue.蓝月亮看起来并不是蓝色的。
- The secondfullmoonin anymonthis called abluemoon.
- Depending onyourtimezone, the Blue Moon ofJuly2004occurredin eitherJulyor amonthlater
- Octoberdid notfeatureabluemoon,contrarytowidespreadreports.
Astronomy
- albedo
- Andromeda
- Aquarius
- Aries
- asteroid
- galactic
- galaxy
- Gemini
- geostationary orbit
- gibbous
- orbit
- orbital
- penumbra
- phase
- Pisces
- substellar
- sunspot
- supergiant
- supermassive
- supermoon
Idiom
once in a blue moon