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  2. Astronomy in the medieval Islamic world - Wikipedia

    en.wikipedia.org/wiki/Astronomy_in_the_medieval...

    These developments mostly took place in the Middle East, Central Asia, Al-Andalus, and North Africa, and later in the Far East and India. It closely parallels the genesis of other Islamic sciences in its assimilation of foreign material and the amalgamation of the disparate elements of that material to create a science with Islamic characteristics.

  3. Astronomical unit - Wikipedia

    en.wikipedia.org/wiki/Astronomical_unit

    This is because the distance between Earth and the Sun is not fixed (it varies between 0.983 289 8912 and 1.016 710 3335 au) and, when Earth is closer to the Sun , the Sun's gravitational field is stronger and Earth is moving faster along its orbital path. As the metre is defined in terms of the second and the speed of light is constant for all ...

  4. Science in the medieval Islamic world - Wikipedia

    en.wikipedia.org/wiki/Science_in_the_medieval...

    The Tusi couple, a mathematical device invented by the Persian polymath Nasir al-Din Tusi to model the not perfectly circular motions of the planets. Science in the medieval Islamic world was the science developed and practised during the Islamic Golden Age under the Abbasid Caliphate of Baghdad, the Umayyads of Córdoba, the Abbadids of Seville, the Samanids, the Ziyarids and the Buyids in ...

  5. Heliosphere - Wikipedia

    en.wikipedia.org/wiki/Heliosphere

    Voyager 1 surpassed the radial distance from the Sun of Pioneer 10 at 69.4 AU on 17 February 1998, because it was traveling faster, gaining about 1.02 AU per year. [70] On July 18, 2023, Voyager 2 overtook Pioneer 10 as the second most distant human-made object from the Sun. [ 71 ] Pioneer 11 , launched a year after Pioneer 10 , took similar ...

  6. Solar System - Wikipedia

    en.wikipedia.org/wiki/Solar_System

    The closest well-measured approach was Scholz's Star, which approached to ~ 50,000 AU of the Sun some ~70 thousands years ago, likely passing through the outer Oort cloud. [267] There is a 1% chance every billion years that a star will pass within 100 AU of the Sun, potentially disrupting the Solar System. [268]

  7. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    In this case, if the Sun is the source of all the light, under the Ptolemaic system: If Venus is between Earth and the Sun, the phase of Venus must always be crescent or all dark. If Venus is beyond the Sun, the phase of Venus must always be gibbous or full. But Galileo saw Venus at first small and full, and later large and crescent.

  8. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Egyptian astronomy - Wikipedia

    en.wikipedia.org/wiki/Egyptian_astronomy

    The Egyptian pyramids were carefully aligned towards the pole star, [citation needed] and the temple of Amun-Re at Karnak was aligned on the rising of the midwinter Sun. [citation needed] Astronomy played a considerable part in fixing the dates of religious festivals and determining the hours of night, and temple astrologers were especially ...