Bayer letters are extremely handy, because instead of memorizing a thousand or so distinct names, you only need to learn the 24 letters of the Greek alphabet and the 88 constellation names and abbreviations. And unlike long-winded "traditional" names, Greek letters make tidy labels on star charts, as you can see at right.
The lowercase Greek letters (the ones used for stars) are listed below. Their precise appearance may vary depending on your computer's fonts. Also, at least two (theta and sigma) have alternate forms quite different from what's shown below.
|Lowercase Greek Letters|
To learn about the designations for fainter stars, read our article "Names of the Stars." Wikipedia has a good introduction to the history and linguistics of the Greek alphabet. And the full alphabet, both upper- and lowercase, is listed below. Uppercase Greek letters aren't used much in astronomy, but they're quite prevalent in science and mathematics and they'll help you read street signs if you ever visit Greece!
The pronunciations below are according to the 4th edition of the American Heritage Dictionary, but the pseudo-phonetic spellings are our own. When in doubt, click on a pronunciation to hear what it really sounds like. Or you can listen to a recording of the entire alphabet. In case you're curious, most Americans pronounce beta as "bayta," most Englishmen say "beeta," modern Greeks say "vayta," and none of these is much like the ancient Greek pronuciation. As is so often the case, there isn't really a "correct" pronunciation.
|The Greek Alphabet|
|Η||η||eta||AY-tuh (rhymes with BAY-tuh), EE-tuh|
|Θ||θ||theta||THAY-tuh, THEE-tuh (th as in thin)|
|Ξ||ξ||xi||ZIGH, SIGH, KSEE|
|Τ||τ||tau||TOW (rhymes with cow), TAW|
|Ψ||ψ||psi||SIGH, PSIGH, PSEE|
|Ω||ω||omega||oh-MEG-uh, oh-MEE-guh, oh-MAY-guh|