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Venus : the Second Planet
Venus is the second planet from the Sun and the sixth largest. On June 8 2004, Venus will pass directly between the Earth and the Sun, appearing as a large black dot trav... |
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Uranus, 7th Planet from the Sun
Uranus is the 7th planet from the Sun. It was discovered in 1781 by William Herschel and named for the Greek god personifying heaven. A blue-green gas giant, it has almos... |
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Neptune, 8th Planet from the Sun
Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus.
In Roman mythology Nept... |
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History and Facts of Calendars
Timeline of interesting calendar facts. Length of the tropical year, defined as the average interval between vernal equinoxes. This calendar year was the objective of the... |
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Anaximander of Miletus, Philosopher
Anaximander, Ionian philosopher of Miletus, the first Greek known to have written (c.546) a book in prose, a treatise on nature, now lost except for one quotation. It was... |
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Anaxagoras, Cause of Eclipses
Greek philosopher of nature remembered for his cosmology and for his discovery of the true cause of eclipses. He was associated with the Athenian statesman Pericles. Abou... |
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Aristarchus, Sun at center of Universe
Aristarchus of Samosis the first person we know of who suggested that the earth might go around the sun and not the other way around. He figured this out by looking at th... |
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Eratosthenes, Measuring the Earth
Eratosthenes of Cyrene was a Greek scholar who lived and worked in Cyrene and Alexandria. Eratosthenes was director of the famous library in Alexandria, and is known for... |
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The Julian Calendar
The Julian calendar was introduced by Julius Caesar in 45 BC. It was in common use until the 1500s, when countries started changing to the Gregorian Calendar. However, so... |
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Ptolemy, Astronomer / Geographer
Claudius Ptolemy lived in Alexandria (in Egypt) from approx. 87 -150 AD. He was an astronomer, mathematician and geographer. He codified the Greek geocentric view of the... |
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Aryabhata, Invention of digit "0" Zero
Aryabhata is the first of the great astronomers of the classical age of India. He was born in 476 AD in Ashmaka but later lived in Kusumapura, which his commentator Bhask... |
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Brahmagupta, Indian Mathematician
Brahmagupta wrote important works on mathematics and astronomy. In particular he wrote Brahmasphutasiddhanta (The Opening of the Universe), in 628. The work was written i... |
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The Venerable Bede, Servant of Christ
The extraordinary life of the Venerable Bede created a rich legacy that is celebrated today at Bede's World, Jarrow, where Bede lived and worked 1300 years ago. "Servant... |
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Ibn al-Haytham, Father of Optics
Ibn al-Haytham was an Arab or Persian Muslim polymath who made significant contributions to the principles of optics, as well as to anatomy, astronomy, engineering, mathe... |
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Al-Biruni, Persian Mathematician
Abu Rayhan Biruni was a Persian mathematician, physicist, scholar, encyclopedist, philosopher, astronomer, astrologer, traveller, historian, pharmacist, and teacher, who... |
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