BibSonomy publications for /user/a_olympia/SystemSat Aug 18 13:22:24 CEST 2007DecemberSurveying the solar system by measuring angles and times: from the solar density to the gravitational constant2004system gravitational solar constant moon sun A surprisingly large amount of information on our solar system can be gained from simple measurements of the apparent angular diameters of the sun and the moon. This information includes the average density of the sun, the distance between earth and moon, the radius of the moon, and the gravitational constant. In this note it is described how these and other quantities can be obtained by simple earthbound measurements of angles and times only, without using any explicit information on distances between celestial bodies. The pedagogical and historical aspects of these results are also discussed briefly.Sat Aug 18 13:22:24 CEST 2007New York, NY, USACommun. ACMJuly7558--565Time, clocks, and the ordering of events in a distributed system211978the clocks ordering time distributed and events system Sat Feb 24 14:50:24 CET 2007AalborgProceedings of the First Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures87-102{BibSonomy}: A Social Bookmark and Publication Sharing System2006bookmark System bibsonomy Social publication BibSonomy Social bookmark tools are rapidly emerging on the Web. In such systems users are setting up lightweight conceptual structures called folksonomies. The reason for their immediate success is the fact that no specific skills are needed for participating. In this paper we specify a formal model for folksonomies and briefly describe our own system BibSonomy, which allows for sharing both bookmarks and publication references in a kind of personal library.