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The story of the stars

One of the most amazing achievements in astronomy was accomplished by the ancient Greeks. Ptolemy, a Greek astronomer who lived in Alexandria in the 2nd century AD, made a comprehensive list of 1,022 stars, illustrating them as members of 48 constellations. This ancient text, called "Almagest", was of great 25.____________(IMPORTANT) because it became the basis of what we recognise in the sky today.

About 800 years after Ptolemy recorded his 26.____________(KNOW) of the heavens, a Persian astronomer, Abd al-Rahman al-Sufi, translated his Greek into Arabic, bringing his stellar stories to another part of the globe. As Ptolemy had never named the individual stars in his work, al-Sufi incorporated Arabic names. His observations were so advanced that his work, "The Book of Fixed Stars", travelled across Europe.

After the 27.____________(INVENT) of the telescope, more and more stars were discovered and named with 28.____________(VARY) influences. To avoid 29.____________(UNDERSTAND) and confusion, in 1922 a group of astronomers decided that it was time to map the stars, putting official boundaries between the constellations to make it easier to navigate the sky and locate specific objects. Now there are 88 official constellations, drawing heavily from Ptolemy's and al-Sufi's works.

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