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The Days That Never Happened – The Gregorian Calendar

The Days That Never Happened – The Gregorian Calendar

Harald Sack
By a papal decree signed on 24 February 1582 by Pope Gregory XIII the days from October 5, 1582 to October 14, 1582 never happened.[9] This was, because the actually used calendar was out of tune with the mechanics of the heavens. The Julian calendar, named after Julius Caesar,[2] did not provide sufficient precision to keep in tune for more than 15 centuries with the effect that the most important liturgic festivals and…
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mathematics
Omar Khayyam – Mathematics and Poetry

Omar Khayyam – Mathematics and Poetry

Harald Sack
On December 4, 1131, Persian mathematician, astronomer, philosopher, and poet, Omar Khayyam; born Ghiyāth ad-Dīn Abu’l-Fatḥ ʿUmar ibn Ibrāhīm al-Khayyām Nīshāpūrī, passed away. He is widely considered to be one of the most influential scientists of the middle ages. He wrote numerous treatises on mechanics, geography, mineralogy and astronomy. “Whoever thinks algebra is a trick in obtaining unknowns has thought it in vain. No attention should be paid to the fact that…
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