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Lyra is a small constellation. Its principal star, Vega, a corner of the Summer Triangle, is one of the brightest stars in the sky. Cygnus constellation one of the most recognizable constellations and features a prominent asterism known as the Northern Cross. Lacerta is a small, faint constellation, its brightest stars form a W shape similar to that of Cassiopeia, and it is sometimes referred to as Little Cassiopeia. Vulpecula was identified in the 17th century, and is located in the middle of the Summer Triangle. The Atlas Coelestis is a star atlas published posthumously in 1729, based on observations made by the First Astronomer Royal, John Flamsteed. The first comprehensive telescopic star catalogue and companion celestial atlas, contains 26 maps of the major constellations visible from Greenwich, with drawings made by James Thornhill. One of his main motivations to produce the Atlas, was to correct the representation of the figures of the constellations, as made by Bayer's, Uranometria (1603). Bayer represented the figures viewed from behind (not from the front, as was done since the time of Ptolemy), which reversed the placement of stars and created unnecessary confusion.
