... The Sun rises higher in summer than in winter. ... Over the course of the year, the angle between the Sun and the zenith (straight up) varies by 47 degrees -- a fourth of the way across the sky. ... A solar incidence angle of 90 degrees means the Sun is on the horizon; an angle of 0 degrees means the Sun is directly overhead; negative angles, which occur only in the tropics, mean that shadows point toward the equator. ... Every day, the stars rise and set along arcs parallel to the celestial equator...

Еще в разделе: (Показать все результаты (>2) - www.astrosociety.org/ )

• ASP: The Nearest Stars: A Guided Tour

... The Stellar Oscillations Network Group (SONG) seeks to study p-mode (acoustic) oscillations in solar type stars. ... The observation of many solar-like stars will also help us to understand how solar p-modes are excited and damped. ... Naively, the two or three orders of magnitude improvement over this provided by the normal 1 second time resolution of the KPNO CCD cameras should be quite sufficient for such a detection. ... Figure: Non-cadenced data-a free-running observing sequence. ...

Еще в разделе: (Показать все результаты (>2) - www.adass.org/ )

... ATNF Home . ... About ATNF overview . ... Parkes radio telescope . ... Parkes | ... Spectrum management . ... Answers for many of these questions will be posted shortly, others simply require reference back to other pages in the Spectroscopy section). ... Why do we see spectral lines of ionised He + in O-class stars but not in the Sun's spectrum? ... If the core of a main sequence star acts like a black body source of a continuous spectrum, why doe we typically see absorption lines in stellar...

Еще в разделе: (Показать все результаты (>13) - www.atnf.csiro.au/ )

• Astrophysics and Cosmic Engine Glossary

... Nous l'avons passИ au crible sur le terrain et sur notre banc optique. ... Il ne reste plus qu'Ю brancher la raquette Autostar pour que le LX 90 soit prЙt Ю l'emploi. ... Mais celle-ci n'est pas des plus explicites et les premiers pas avec la "bЙte" seront Ю coup sШr hИsitants pour qui n'est pas habituИ Ю ce type de systХme. ... NИanmoins, pour ne pas se ruiner en piles, il est prИfИrable d'opter pour des accus, une batterie ou encore une alimentation sur secteur (non fournie). ...

Еще в разделе: (Показать все результаты (>5) - www.cieletespace.fr/ )

... 7834 February 1, 2008 c ESO 2008 Isotopic anomaly and stratification of Ca in magnetic Ap stars T. Ryabchikova1,2 , O. Kochukhov3 , and S. Bagnulo4 1 2 3 4 Department of Astronomy, University of Vienna, Turkenschanzstraъe 17 ... Armagh BT61 9DG, Northern Ireland Received / Accepted ABSTRACT A im s. We have carried out an accurate investigation of the Ca isotopic composition and stratification in the atmospheres of 23 magnetic chemically peculiar (Ap) ... 2003; Ryabchikova et al. ...

Еще в разделе: (Показать все результаты (>6) - star.arm.ac.uk/ )

... Limitations in current analyses Ї Likelihoods are constructed with no regard to data order Ї ignoring auto-regression and ICA/SCA Ї fluctuations in consecutive bins, or groups of like fluctuations require human intervention via residual analysis Ї Coincidences cannot be evaluated nonparametrically in multiple data streams Ї we are more likely to believe that something is real if a signal is seen simultaneously in independent data ... Still can't deal with grouped fluctuations. ...

Еще в разделе: (Показать все результаты (>7) - hea-www.harvard.edu/ )

... First Contact Moon begins to move over Sun from West Starts at ~5:44:45 AM (about 10 minutes after sunrise) Must observe sun with filter! Good time to check and adjust mount tracking and alignment Watch for sunspots 6/21/ 2001 - Zambia ( Mario Motta ) First Contact Crescent images of Sun Natural pin-holes such as leaves on trees Pin-holes in cardboard Mario Motta Watch sky and environment Gradually darkens Temperature drops 8/11/1999 Hungary (Eric Pauer) ~1 min Before Second ...

Еще в разделе: (Показать все результаты (>5) - www.atmob.org/ )

Director : Rex Parker (609) 730-0670 drexparker@aol.com ereal times id s The Official Publication of the Amateur Astronomers Association of Princeton Treasurer: Ron Mittlestaedt (609) 771-6981 C8User@aol.com Secretary: Mark Jaworsky (609) 333-1130 MarkianSJ@comcast.net Program Chairman : Mark Lopez (609) 393-2565 mal455@earthlink.net Editor: Victor Belanger (609) 448-8598 vic@apink.com Assistant ... The meeting seems to drag on especially when the light pollution committee gives their report. ...

Еще в разделе: (Показать все результаты (>2) - www.princetonastronomy.org/ )

• http://www.princetonastronomy.org/newsletters/12_2004sidereal.pdf