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Famous Stargazers              Famous Stargazers
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نمایش نتایج: از شماره 11 تا 20 , از مجموع 60

موضوع: Famous Stargazers

  1. #1
    کاربر ممتاز آوا استار ستاره بنیادی آواتار ها
    تاریخ عضویت
    Aug 2010
    محل سکونت
    تهران
    نوشته ها
    883
    تشکر
    3,291
    تشکر شده 8,433 بار در 878 ارسال
    ویرایش توسط stargazer : 06-04-2012 در ساعت 01:34 PM دلیل: ordering
    گاهی ستاره هدیه کن به مشت پوچ شب ها ...


  2. #11
    کاربر ممتاز آوا استار
    تاریخ عضویت
    Jun 2011
    نوشته ها
    759
    تشکر
    11,042
    تشکر شده 5,806 بار در 807 ارسال

    Eratosthenes

    Eratosthenes


    276–195 B.C.

    This Greek astronomer was the first to measure the size of Earth accurately. He determined that the earth's polar diameter was about 7,850 miles. (In fact, the distance is actually 7,900.)


    more information at This Link
    ویرایش توسط Amin-Mehraji : 02-19-2012 در ساعت 03:55 PM

  3. 6 کاربر مقابل از Amin-Mehraji عزیز به خاطر این پست مفید تشکر کرده اند.


  4. #12
    ديوان سالار ويكی نجوم هانیه امیری آواتار ها
    تاریخ عضویت
    Sep 2011
    محل سکونت
    تبریز
    نوشته ها
    1,068
    تشکر
    14,157
    تشکر شده 11,950 بار در 1,080 ارسال

          (Khayyáam, Omar (1048–1122

    (Khayyáam, Omar (1048–1122

    Persian mathematician, astronomer, and poet who, on the accession as sultan of Jalal ad Din Malik Shah, was appointed astronomer royal. Other leading astronomers were also brought to the court observatory in Esfahan and, for 18 years, Khayyam supervised and produced work of outstanding quality. During this time, Khayyam led work on compiling astronomical tables and he also contributed to calendar reform in 1079. He measured the length of the year as 365.24219858156 days, which is incredible on two accounts: first that anyone would have the audacity to claim this degree of accuracy (we know now that the length of the year changes in the sixth decimal place within a lifetime) and second that it is astonishingly accurate. For comparison, the length of the year at the end of the 20th century was 365.242190 days.
    وقتی خدا را دیدم که مشکلم را حل می کرد، من به توانایی او ایمان می آوردم

    و وقتی حل نمی کرد


    می فهمیدم او به توانایی من ایمان دارد...


  5. 5 کاربر مقابل از هانیه امیری عزیز به خاطر این پست مفید تشکر کرده اند.


  6. #13
    کاربر ممتاز آوا استار رخساره روشنی آواتار ها
    تاریخ عضویت
    Nov 2011
    محل سکونت
    Hamedan
    نوشته ها
    632
    تشکر
    8,638
    تشکر شده 7,686 بار در 659 ارسال

          Ghyath al-Din Jamshid Kashani






    Ghyath al-Din Jamshid Kashani
    Ghyath al-Din Jamshid Kashani was born about 1380 CE in Kashan, Iran and died on 22 June 1429 in Samarkand, Transoxania (now Uzbekistan). At the time that Kashani was growing up Timur (often known as Tamburlaine) was conquering large regions. He had proclaimed himself sovereign and restorer of the Mongol empire at Samarkand in 1370 and, in 1383, Timur began his conquests in Persia with the capture of Herat. Timur died in 1405 and his empire was divided between his two sons, one of whom was Shah Rokh.


    While Timur was undertaking his military campaigns, conditions were very difficult with widespread poverty. Kashani lived in poverty, like so many others at this time, and devoted himself to astronomy and mathematics while moving from town to town. Conditions improved markedly when Shah Rokh took over after his father's death. He brought economic prosperity to the region and strongly supported artistic and intellectual life. With the changing atmosphere, Kashani's life also improved. The first event in Kashani's life which we can date accurately is his observation of an eclipse of the moon which he made in Kashan on 2 June 1406 (He dated many of his works with the exact date on which they were completed.).

    It is reasonable to assume that Kashani remained in Kashan where he worked on astronomical texts. He was certainly in his home town on 1 March 1407 when he completed Sullam Al-sama the text of which has survived. The full title of the work means The Stairway of Heaven, on Resolution of Difficulties Met by Predecessors in the Determination of Distances and Sizes (of the heavenly bodies). At this time it was necessary for scientists to obtain patronage from their kings, princes or rulers. Kashani played this card to his advantage and brought himself into favour in the new era where patronage of the arts and sciences became popular. His Compendium of the Science of Astronomy written during 1410-11 was dedicated to one of the descendants of the ruling Timurid dynasty

    For Read More About Him Click On This Link:
    http://www.iranchamber.com/personali...id_kashani.php
    ویرایش توسط رخساره روشنی : 02-19-2012 در ساعت 05:02 PM دلیل: insert picture

  7. 8 کاربر مقابل از رخساره روشنی عزیز به خاطر این پست مفید تشکر کرده اند.


  8. #14
    ديوان سالار ويكی نجوم هانیه امیری آواتار ها
    تاریخ عضویت
    Sep 2011
    محل سکونت
    تبریز
    نوشته ها
    1,068
    تشکر
    14,157
    تشکر شده 11,950 بار در 1,080 ارسال

          (Al-Sufi, Abd al-Rahman (AD 903–986

    نقل قول نوشته اصلی توسط fampersi نمایش پست ها
    Azophy
    one of the greatest Iranian astronomer is Azophy
    he was born on november 8th 904 in ray
    It is reported that the observation galaxies
    he is the first person who can observed the galaxies without telescope and who has seen the galaxies
    the name of the Azophy is on the moon
    his name is on the some of the holes of the moon
    because he is a very famous astronomer among many astronomers in the other countries
    he has worked a lot, such as discovering lesser magellanic cloud
    other one is correcting some ptolemy's fault
    and at the end he died on 986 in shiraz

    (Al-Sufi, Abd al-Rahman (AD 903–986

    Persian nobleman and astronomer, also known in the West by the Latinized name Azophi, who lived at the court of the Emire Adud ad-Daula and carried out observations based on Greek work, especially the Almagest of Ptolemy. Al-Sufi's The Book of the Fixed Stars (Kitab al-Kawatib al-Thabit al-Musawwar), published in about AD 964, includes a catalogue of 1,018 stars, giving their approximate positions, magnitudes, and colors. It contains Arabic star names that, in corrupted form, are still in use today, and the earliest known reference to the Andromeda galaxy. Al-Sufi also recorded and named a southern celestial feature al-Baqar al-Abyad (the White Bull), which today we know as the Large Magellanic Cloud.

    The Book of the Fixed Stars remains an important source of historical information in studies of proper motion and long- period variables
    .
    وقتی خدا را دیدم که مشکلم را حل می کرد، من به توانایی او ایمان می آوردم

    و وقتی حل نمی کرد


    می فهمیدم او به توانایی من ایمان دارد...


  9. 6 کاربر مقابل از هانیه امیری عزیز به خاطر این پست مفید تشکر کرده اند.


  10. #15
    کاربر ممتاز آوا استار
    تاریخ عضویت
    Jun 2011
    نوشته ها
    759
    تشکر
    11,042
    تشکر شده 5,806 بار در 807 ارسال

    Tycho Brahe

    Tycho Brahe
    1546-1601


    Before the invention of the telescope, the Danish astronomer Tycho Brahe revolutionized astronomy by establishing the importance of accurate observations. He invented an improved sextant and used it to make precise observations of the positions of stars and planets.

    Brahe completely recalculated Ptolemy’s astronomical tables, which contained many errors, and catalogued over one thousand stars during his lifetime. He built Europe’s first observatory and taught the art of observation to a generation of astronomers.

    In 1572 Brahe made careful observations of a “new star” (actually a supernova) that appeared suddenly in the constellation Cassiopeia. He showed that the object was not in the Earth’s atmosphere but was actually beyond the orbit of the moon. This discredited the prevailing theory that the heavens are static and unchanging.


    also you can readThis Link
    ویرایش توسط Amin-Mehraji : 02-20-2012 در ساعت 10:21 AM

  11. 6 کاربر مقابل از Amin-Mehraji عزیز به خاطر این پست مفید تشکر کرده اند.


  12. #16
    کاربر ممتاز آوا استار
    تاریخ عضویت
    Jun 2011
    نوشته ها
    759
    تشکر
    11,042
    تشکر شده 5,806 بار در 807 ارسال

    Johannes Kepler

    Johannes Kepler
    1571-1630


    Armed with Tycho Brahe’s very accurate observations of the planets and his own painstaking measurements, the German astronomer Johannes Kepler discovered what we now call Kepler’s laws of planetary motion. These three laws precisely describe the motions of the planets around the sun.

    Kepler’s first law states that planets move in elliptical orbits around the sun. This overturned the ancient dogma that the planets move in perfect circles. His second law describes how a planet travels faster in its orbit when it is closer to the sun. The third law describes how the orbital periods of the planets increase with the size of their orbits.

    Kepler’s laws were based on the Copernican view of a heliocentric universe. Newton relied on them when he developed his more general law of universal gravitation.

    also you can read This Link

  13. 6 کاربر مقابل از Amin-Mehraji عزیز به خاطر این پست مفید تشکر کرده اند.


  14. #17
    کاربر ممتاز آوا استار
    تاریخ عضویت
    Jun 2011
    نوشته ها
    759
    تشکر
    11,042
    تشکر شده 5,806 بار در 807 ارسال

    Albert Einstein

    Albert Einstein

    1879-1955




    The German physicist Albert Einstein revolutionized our concepts of space and time with his theories of relativity.

    In 1905 Einstein published hisspecial theory of relativity.The foundation of the theory is the observation that light moves at a constant speed as measured by all observers, whatever their state of motion. One consequence is that measurements of distance and time are not absolute quantities but vary relative to the motion of an observer. Another is that energy (E) can be converted into mass (m), and vice versa, according to the formula
    E = mc2, where c is the speed of light.

    Ten years later, Einstein’sgeneral theory of relativityextended this work to include acceleration and gravity—stating that the two are equivalent. Einstein showed that gravity is actually the warping of space by matter. One consequence is that light will follow a curved path when it passes a massive body. Observations of a small apparent shift in the positions of stars near the sun during a solar eclipse in 1919 showed that the theory was correct. General relativity was later used to interpret Hubble’s discovery of the expanding universe
    .

    also you can read more about Albert Einstein at This Link
    ویرایش توسط Amin-Mehraji : 02-21-2012 در ساعت 09:32 PM

  15. 6 کاربر مقابل از Amin-Mehraji عزیز به خاطر این پست مفید تشکر کرده اند.


  16. #18
    ديوان سالار ويكی نجوم هانیه امیری آواتار ها
    تاریخ عضویت
    Sep 2011
    محل سکونت
    تبریز
    نوشته ها
    1,068
    تشکر
    14,157
    تشکر شده 11,950 بار در 1,080 ارسال

          (Abu'l Wafa (AD 940–998

    (Abu'l Wafa (AD 940–998


    Persian mathematician and astronomer who was the first to describe geometrical constructions possible only with a straightedge and a fixed compass, later dubbed a "rusty compass," that never alters its radius. He pioneered the use of the tangent function, apparently discovered the secant and cosecant functions, and compiled tables of sines and tangents at 15 arc-minute intervals – work done as part of an investigation into the orbit of the moon.
    وقتی خدا را دیدم که مشکلم را حل می کرد، من به توانایی او ایمان می آوردم

    و وقتی حل نمی کرد


    می فهمیدم او به توانایی من ایمان دارد...


  17. 4 کاربر مقابل از هانیه امیری عزیز به خاطر این پست مفید تشکر کرده اند.


  18. #19
    کاربر ممتاز آوا استار
    تاریخ عضویت
    Jun 2011
    نوشته ها
    759
    تشکر
    11,042
    تشکر شده 5,806 بار در 807 ارسال

    Georges Lemaître

    Georges Lemaître

    1894-1966




    Georges Lemaître, a Belgian cosmologist and Catholic priest, was one of the first scientists to use Einstein’s general theory of relativity to describe the universe as a whole. In 1927, he showed how the expansion of the universe, observed by Hubble, was a natural consequence of the equations of general relativity.

    Lemaître also thought about the expansion of the universe in a radically new way. If we could imagine tracing the expansion backward in time, we would see it getting smaller and smaller. Wouldn’t there be a limit to how small it could get? In 1931, Lemaître proposed that at some point in the distant past, the universe was compressed into a tiny object which he called the “cosmic egg.” This cosmic egg would have exploded—launching the expansion of space itself that we still see today. This theory later became known as thebig bangand provided the first scientific description of how the universe began.


    aslo you can read more about Georges Lemaître at This Link

  19. 4 کاربر مقابل از Amin-Mehraji عزیز به خاطر این پست مفید تشکر کرده اند.


  20. #20
    ديوان سالار ويكی نجوم هانیه امیری آواتار ها
    تاریخ عضویت
    Sep 2011
    محل سکونت
    تبریز
    نوشته ها
    1,068
    تشکر
    14,157
    تشکر شده 11,950 بار در 1,080 ارسال

          (Messier, Charles Joseph (1730–1817

    Famous Stargazers         
    (Messier, Charles Joseph (1730–1817


    French astronomer famed for his list of more than 100 bright deep-sky objects, now known to be a variety of nebulae, star clusters, and galaxies . Principally a comet-hunter – Louis XV called him the "Comet Ferret" – Messier compiled his list of other fuzzy-looking objects so that he and others wouldn't keep confusing them for comets.

    Little is known about him prior to his joining the Paris Observatory as a draftsman and astronomical recorder. His interest in comets stemmed from the return of Halley's comet, which Edmond Halley predicted would take place around the beginning of 1759. Messier sighted its return on Jan. 12, 1759, an experience that inspired him to search for new comets for the rest of his life. (Although he is attributed with being the first person to re-sight Halley's Comet on French soil, the German amateur astronomer Palitzch is believed to have been the first of all to see it, on Christmas Day, 1758.) His final comet tally stood at 15 unique discoveries and six further co-discoveries. The compilation of his famous catalogue began in about 1760 and took more than two decades, during which time he used a variety of telescopes, including a 6-inch reflector and a 3½-inch refractor.

    وقتی خدا را دیدم که مشکلم را حل می کرد، من به توانایی او ایمان می آوردم

    و وقتی حل نمی کرد


    می فهمیدم او به توانایی من ایمان دارد...


  21. 3 کاربر مقابل از هانیه امیری عزیز به خاطر این پست مفید تشکر کرده اند.


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