[Elennar Starfire]

Here it is, all the info you can get from World Book Encylcopedia, condensed by 'Leny. (now you all don't have to go digging through all those encyclopedias for the seperate articles on each sign!)
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The Zodiac

Aries, The Ram: 22 March-19 April
Fire sign, ruled by Mars
Bold, courageous, determined, energetic, hot-tempered, impatient, strong, lose interest quickly in tasks that require much time, like excitement and variety.

Taurus, The Bull: 20 April-20 May
Earth sign, ruled by Venus
Affectionate, conservative, loyal, stubborn, patient, trustworthy, appreciate beauty, comfort, and nature, move slowly, may be lazy, finish what they begin, "down-to-earth", not talkative, hold grudges, even-tempered, but fierce when angered.

Gemini, The Twins: 21 May-20 June
Air sign, ruled by Mercury
Curious, lively, moody, restless, two-sided personality, sees both sides of an issue, change moods quickly, indecisive, talkative, witty, talents for communication and language.

Cancer, The Crab: 21 June-22 July
Water sign, ruled by the Moon
Artistic, emotional, home-loving, instinctive, patriotic, shy, intuitive, sensitive, put dreams over reality, can be hard to get along with, sometimes selfish, aware of public needs.

Leo, The Lion: 23 July-22 August
Fire sign, ruled by the Sun
Cheerful, colourful, generous, kind, proud, powerful, energetic, good leaders, enjoy being the center of attention.

Virgo, The Virgin: 23 August-22 September
Earth sign, ruled by Mercury
Careful, efficient, modest, practical, tidy, intelligent, often have an interest in health, find fault with things other people think unimportant, critical, rely on reason, work in the background, may seem unsympathetic.

Libra, The Scales: 23 September-22 October
Air sign, ruled by Venus
Companionable, diplomatic, friendly, intelligent, pleasant, thoughtful, like balance and harmony, dislike conflict and sudden changes, good at patching up quarrels, indecisive, compromise easily, have an eye for beauty.

Scorpio, The Scorpion: 23 October-21 November
Water sign, ruled by Mars and Pluto
Aggressive, intense, moody, passionate, secretive, quick-tempered, often get respect rather than affection.

Sagittarius, The Archer: 22 November-21 December
Fire sign, ruled by Jupiter
Cheerful, enthusiastic, generous, outgoing, relaxed, warm, like to be surrounded by friends, have trouble following direction, spend money impulsively, thoughtful, fond of exploring ideas, good at far-sighted desicions, like change and travel, independent.

Capricorn, The Goat: 22 December-19 January
Earth sign, ruled by Saturn
Ambitious, cautious, dignified, patient, persistent, practical, don't have much of a sense of humour, enjoy challenge of difficult problems, don't rush into friendships, loyal, stubborn.

Aquarius, The Water Bearer: 20 January-18 February
Air sign, ruled by Saturn and Uranus
Curious, independent, modern, serious, open-minded, outgoing, don't respect tradition, logical and scientific, have many friends but are hard to get to know well, avoid close relationships, support social/political causes with great enthusiasm, enjoy shocking people with their behavior.

Pisces, The Fishes: 19 February-20 March
Water sign, ruled by Jupiter and Neptune
Emotional, friendly, imaginative, intelligent, sensitive, vague, ruled by emotions, talented, have trouble with practical problems, retreat from reality, have a keen awareness of other people's moods, have trouble commiting to long-term action, drift from one thing to another.

The Planets

Mercury-talkative and witty
Venus-beauty and love
Saturn-disciplined
Uranus-change and disturbance
Mars-force and violence
Pluto-secrecy
Jupiter-wise and friendly

The Houses

1st-appearance and personality
2nd-possessions
3rd-family relations
4th-parents
5th-children
6th-health
7th-friends and marriage
8th-death
9th-travel
10th-career
11th-ideals
12th-illness and sorrow
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Hope that's useful to someone. If Ka has any corrections, she's probably right. Oh, and the dates vary slightly depending on your source.

I would say Boromir is a Cancer, not a Scorpio. Cancers are "patriotic, aware of public needs, and sometimes selfish". Boromir rationalizes taking the ring as protecting the people of Gondor. He also wants the personal glory.