This section describes the calculation by which Aristarchus used the duration of a total lunar eclipse to deduce the distance of the Moon. ... This lesson plan supplements: "How Distant is the Moon--1", section #8c: on disk Shipprc2.htm , on the web . ... The shadow of the Earth at the Moon's distance is narrower than the Earth, because the Sun is seen not as a point but as a disk 0.5 degrees wide. ... An eclipse of the Moon is the passage of the Moon through the shadow of the Earth. ...

... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2007 June 20 . A Daylight Eclipse of Venus . ... Just two days ago, two of the three celestial objects easily visible during the day appeared to collide. ... Moments after this image was taken, the Moon, visible as the crescent on the right of the above image , eclipsed Venus , appearing near half phase on the lower left. ... About APOD | ...

Astronomy Picture of the Day . ... Eris: More Massive than Pluto . ... Monitoring M2-9 . ... About 2,100 light-years away and over one light-year across, M2-9 is known as a twin jet or butterfly nebula in reference to its striking bipolar symmetry. ... Of course M96 is a spiral galaxy, and counting the faint arms extending beyond the brighter central region it spans 100 thousand light-years or so, about the size of our own Milky Way. vdB 152: Reflection Nebula in Cepheus . ... 100 | ...

... Главная . ... Новости . ... Проекты . Любителям астрономии . Проект ISON . ... Подробнее . ... Категория: Новости проекта ISON . ... Метки: Космический мусор ,љ Астероиды ,љ Гамма-всплески ,љ Любителям астрономии ,љ Кометы љ . ... Метки: Космический мусор ,љ Астероиды ,љ Любителям астрономии љ . ... Новости обсерваторий проекта] - Обсерватория Кубанского государственного университета от Иванов А - 09.04.2016 11:08:49 . ... 1999-2013 Copyright "Астрономия и Телескопостроение" . ...

... More on 51 Peg: . The discovery of a Jupiter--mass planet in orbit around the solar--type star 51Peg has been reported by Michel Mayor and Didier Queloz (Geneva Observatory) on October 6th at the 9th Cambridge workshop on "cool stars, stellar systems, and the sun" held at Florence (Italy). ... Recall that the measurements of radial velocity only yield v sin i which in turn gives us M sin i. For most values of i, sin i will be greater than 0.5 and this gives a mass estimate of 0.5 Jupiter masses. ...

... Contact . ... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Development of the 20 March 2015 partial solar eclipse as seen from Northern Ireland from first contact at 08:26 to eclipse maximum at around 09:30. ... Armagh Observatory reports that the largest partial solar eclipse visible from Northern Ireland since 1927, when 97 percent of the SunтАЩs disc was obscured, occurs between 08:26 and 10:38 on the morning of Friday 20 March 2015. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Solar System . ... Moon . ... Comets and Asteroids . ... What changed our view of Chariklo is the discovery of a ring system around it, the first such feature found around a Solar System body smaller than a gas giant planet. ... Almost certainly the rings were born when a collision with a smaller asteroid blasted millions of tonnes of debris off CharikloтАЩs surface. ... A ring system detected around the Centaur (10199) Chariklo (Braga-Rigas et al.) ...

... White Dwarf Spectra . ... New Paper! 9.24.2012 The WIRED Survey III: An Infrared Excess around the Eclipsing Post-Common Envelope Binary SDSS J030308.35+005443.7 , accepted to ApJ. ... Debes Sigurdsson, 2002 reaches 100 citations 2.20.2012 One of my first papers as a graduate student and the subject of my second year project, "Are There Unstable Planetary Systems around White Dwarfs?", has just broken the 100 citation count. ... I've accepted a new position! ... Welcome to my new webpage! ...

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE ANCIENT UNIVERSE . c) The Age of Light from the Most Distant Galaxies: The "Time Machine" Effect . ... Thus we are actually seeing these galaxies not as they are today, but as they were billions of years ago. ... The Universe: An Overview | ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...

... This year's eclipse is unique in duration. ... Although, at the present time, there are 6 solar observatories belonging to leading space agencies in orbit around the Earth, the eclipse of 22 July, 2009, will only be seen by two of them: the Russian CORONAS-PHOTON satellite equipped with TESIS telescopes and Japan's HINODE satellite fitted with an XRT space telescope. ... TESIS will be the first of the two devices (and the very first on Earth) to witness the solar eclipse. ...

... Home eclipse_10_08_2014 . ... Lecture Series 2014-2015 . ... AAA Fall Astronomy Class: Astronomy Basics тАУ October-November 2015 . ... This Month's Sky . ... This Month's Sky - 2015 . This Month's Sky - January 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

Educator's Guide to Eclipses . ... In a solar eclipse you observe the Sun (using only safe methods, of course). ... In a lunar eclipse you observe the Moon. ... Because of the geometry described below, you can only view a solar eclipse when the Sun is up, and the Moon is nowhere to be seen. ... Eclipses occur when the Sun, Earth and Moon line up. ... In a solar eclipse the Moon passes directly in front of the Sun. ... In a lunar eclipse the Moon moves into Earth's shadow. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... If you said Pluto, sorry, that's incorrect. ... However, that's two-dimensional thinking; actually, the orbits are tilted and never intersect. ... Pluto has a very large moon named Charon, which revolves around Pluto in a very tight orbit (actually, the two both circle a common center of gravity). ... I have a small bit about Pluto in my Bad News section too! 2008 Phil Plait. ...

Next: Characteristics of the Up: The Epsilon Aurigae Previous: The Epsilon Aurigae . ... Epsilon Aurig? is an F0 Ia star with an enigmatic companion which partially eclipses the visible star for 2 years every 27.1 years. ... The eclipse light curve has a long, flat minimum (Figure ), implying that the secondary is not appreciably convex. ... We develop hydrostatic models for the Aurig? secondary in Section D.3 and present synthetic eclipse light curves calculated using these models in Section D.4. ...

... We have measured this "redshift" for the pink black holes, and allowed for it in our calculations. ... We see this effect in the emission from gas around these pink black holes, but it is far too small an effect to account for the pinkness. Thus the swirling motions of gas around or into the black holes cannot produc the colour. ... At first we thought that these things were normal blue black holes hidden behind clouds of interstellar dust, that absorbed the blue light and made them appear pink. ...

... This disc of cosmic dust will one day form into planets. ... Just 4.5 billion years ago our very own Earth was born from a similar disc. ... They measured a bitterly cold temperature of ?266њC. Not only is that much colder than they?d anticipated but it?s only 7 њC above absolute zero. Absolute zero is the coldest temperature possible ? ... The coldest temperature ever recorded was in a laboratory on Earth where the temperature dipped to a glacial -273 њC (less than 1 њC above absolute zero!) ...

... Gravitational wave search provides insights into galaxy evolution and mergers . ... Astronomers find most distant galaxy candidate yet seen . ... Astronomers studying ultra-deep imaging data from the Hubble Space Telescope have found what may be the most distant galaxy ever seen, about 13.2 billion light-years away. ... However, we could only find one galaxy candidate just 170 million years earlier," Illingworth said. ... Only registered members of Astronomy.com are allowed to comment on this...

Having studied the solar corona and its radio emissions sunspot cycles ago, I was keen to verify its existence optically during the total solar eclipse of Wednesday, 4 December 2002, the first on Australian soil since 1976. The moon's shadow was to travel from the south-Atlantic west of The Congo, across southern Africa, the Indian Ocean and into the Great Australian Bight, finally making Australian landfall at Ceduna, South Australia (SA). ... The favoured site to observe the eclipse was Ceduna. ...

... The discovery of this radiopulsar is potentially important not only for confirming the theory of evolution of NS, but also for understanding processes occurring in stellar winds   from normal stars. After all, a radiopulsar orbiting in the semi-transparent stellar wind of a normal star is a sort of probe scanning an inhomogeneous plasma by pulsed radiation (Lipunov and Prokhorov, 1984)[ 110 ]. ... 1) absorption of radio waves (light curve); . ... This object is a radiopulsar orbiting a Be-star. ...