muḥyī al-dīn maghribī is among the few astronomers of the middle ages whose astronomical system is entirely based on new measures of planetary parameters and whose measurement of the observational data and calculation processes for determining their amount have been carried out in maragha observatory. he has explained the details of his observations and calculations in a volume called talkhīṣ a...

Aims. We study the visibility of sunspots and its influence on observed values of sunspot region parameters. Methods. We use Virtual Observatory tools provided by AstroGrid to analyse a sample of 6862 sunspot regions. By studying the distributions of locations where sunspots were first and last observed on the solar disk, we derive the visibility function of sunspots, the rate of magnetic flux ...

Observatory (iSERVO; www.iservo. edu.au) is a planned partnership of primarily Asia Pacific economies interested in studying, forecasting, and mitigating the damaging effects of large and great earthquakes as well as the tsunamis they produce. The iSERVO concept is founded on the use of modern information technology to simulate the nonlinear dynamical earthquake and tsunami processes at all rel...

A virtual observatory will not only enhance many current scientific investigations, but it will also enable entirely new scientific explorations due to both the federation of vast amounts of multiwavelength data and the new archival services which will, as a necessity, be developed. The detailing of specific science use cases is important in order to properly facilitate the development of the n...

Astronomy is one of the most data-intensive of the sciences. Data technology is accelerating the quality and effectiveness of its research, and the rate of astronomical discovery is higher than ever. As a result, many view astronomy as being in a “Golden Age”, and projects such as the Virtual Observatory are amongst the most ambitious data projects in any field of science. But these powerful to...

Scientific data services are increasing in usage and scope, and with these increases comes growing need for access to provenance information. Our goal is to design and implement an extensible provenance solution that is deployed at the science data ingest time. In this paper, we describe our work in the setting of a particular set of data services in the area of solar coronal physics. The paper...

Based on almost three years of experience in developing and deploying scientific data frameworks built using semantic technologies, we now have a production virtual observatory in operation, serving two broad communities: solar physics and terrestrial upper atmospheric physics. Within this application, a data framework provides online location, retrieval, and analysis services to a variety of h...

[email protected] 2Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory, Mizusawa, Iwate 023-0861 3VERA Project Office, National Astronomical Observatory, Mitaka, Tokyo 181-8588 4Faculty of Science, Kagoshima University, Kagoshima, Kagoshima 890-0065 5Nishi-Harima Astronomical Observatory, Sayo, Hyogo 679-5313 6Nobeyama Radio Observatory, National Astronomical Obs...

In this paper we summarize the main properties of the ENACS (the ESO Nearby Abell Cluster Survey), which was one of the ESO Keypro-grammes carried out in the first half of the 1990's, and we discuss some recent work on the properties of the galaxies in the rich clusters in the ENACS sample. We stress the importance of the ENACS sample as a local , volume-limited sample of rich ACO clusters, whi...

In the near future several new surveys will provide tens of Terabytes of catalogued data for the astronomy community. The archives for these projects are currently being designed. Soon there will be an enormous pressure from the whole astronomical community to integrate these separate archives into a seamlessly interoperating entity. The public access of such amounts of data, and the necessary ...