Introduction
Constellations are orientation aids devised by humans. The perceptual-physiological principle behind them is “gestalt seeing”: since our brain is always looking for patterns, we recognise figures in seemingly disorderly collections of objects. The imagined figures are taken from what we are used to seeing in everyday life and have therefore memorised. e.g. we recognise some animals in clouds or other figures in star groupings. However, the viewing habits of people from different cultures (in different places or at different times) are very different, so that different constellation cultures have been created around the world.
In the 1920s, the International Astronomical Union (IAU) commissioned a Belgian astronomer to clear up this hullabaloo in the sky and to create a uniform constellation system that has been officially used since 1930.
