History of the star: Spiculum is Latin for dart or point of an arrow or similar weapon. The Lagoon Nebula is a cluster of stars on the Bow of the Arrow of Sagittarius.

The astrological influences of the constellation: The Archer is associated with the Hebrew letter Vau and the 6th Tarot Trump "The Lovers". (Fixed Stars and Constellations in Astrology , Vivian E. Robson, 1923)

The astrological influences of the constellation given by Manilius:

"As for the Archer, when the foremost portion of his cloak rises, he will give birth to hearts renowned in war and will conduct the conqueror, celebrating great triumphs in the sight of all, to his country's citadels. Such a one will build high walls (moenia from Latin murus) one moment and pull them down the next. But if Fortune favours them too generously with success, the mark of her envy is to be seen on their faces, for she works cruel havoc upon their features. So was it that a dread warrior^* paid for his victories at the Trebia, Cannae, and the Lake, even before the hour of his retreat, with such disfigurement." [Translator's note: *Hanibal who lost an eye (Livy 22.2.11: Sagittarius is one-eyed; see p.103) [Manilius, Astronomica, 1st century AD, book 4, p.267]

But they whose lot it is to be born under the Centaur of double form delight in yoking a team, in bringing a fiery horse to obey the pliant reins, in following herds which graze all over the grasslands, and in imposing a master on every kind of quadruped and taming them: they soften tigers, rid the lion of his fierceness, speak to the elephant and through speech adapt its huge bulk to human skills in a variety of displays. Indeed, in the stars of this constellation the human form is blended with a beast's and placed above it; wherefore it has lordship over beasts. And because it carries a shaft poised on drawn bow, it imparts strength to limb and keenness to the intellect, swiftness of movement, and an indefatigable spirit. [Manilius, Astronomica, 1st century AD, book 4, p.241.]  

The general astrological influences of the star: Ptolemy rates it as a Mar-Moon type, another of the 'blind stars' and a figure of great foreboding. We must at least go along with the planetary simile, for there is indeed a strong tendency towards depression and a rather morbid outlook religiously, in horoscopes having this star strong and harshly aspected. Such a condition does of itself make for all manner of problems, psychological and physical, eyesight included. There is often that feeling of negative 'fear of God', rather than comfort from the sensing of His Presence, the feeling that He is Omnipotent in such a way that the individual's life is of no concern to Him, so that we are hopelessly doomed. The classic novel The day of the Trifids, with its fear of extinction of humanity by mere plants, conveys the negative associations of this nebula perfectly. But well aspected, the Trifid, or Spiculum, shows just the opposite in the person. There can be a very real feel of companionship with the entire Universe and its Creator and remarkable ability to plunge deeply into the seas of philosophy and come up with joyous and meaningful answers through a very happy intuition. (The Living Stars, Dr. Eric Morse).