Astronomy Abbreviations and Acronyms
- BTOKBulletin of The Tokyo Aspronomical Observatory
- BTSBits Per Second
- BTTBureau of Technology Transfer
- BTUBritish Thermal Unit
- BTWBy The Way
- BUBESBulletin of The University of Besancon Observatory
- BUBESBulletin of The Universityrsity of Besancon Observatory
- BULBulletin
- BULLBulletin
- BULL AM ASTRON SOCBulletin of The American Astronomical Society
- BULL ASTRON SOC INDIABulletin of The Astronomical Society of India
- BUSATBeihang University Satellite
- BWIBaltimore-Washington International Airport, between Baltimore, Maryland and Washington, DC, United States
- BWTBy The Way
- BYBy Draconis
- BZBrillouin zone - a uniquely defined primitive cell in reciprocal space
- CACoronagraphic Apodizer
- CACalibration Unit
- CAAACapital Area Astronomy Association
- CAASCentral Arkansas Astronomacal Society
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