- - - 19. května 2019

Given that some people claim the curvature of the Earth is not accounted for in surveying, I thought it would be interesting to document various historical instances of this, and of accounting for refraction. Curvature comes up in two ways. Firstly it arises when determining latitude and longitude by observation of sun and stars. The Earth here is assumed to be a sphere, and the stars essentially fixed in a "celestial sphere" infinitely far away. Secondly it comes up in the practice of... Curvature and Refraction in Surveying and Leveling Through History. Old Books, etc. Číst dále >>>

Michal Repik nets two goals as Team Czech Republic rolls over Team Austria, 8-0, as the Czechs fight for a top spot in Group B during the preliminary round of the IIHF Men’s World Championship For the latest hockey action, subscribe to our channel by clicking the big, red shiny SUBSCRIBE button Watch live hockey wherever you are: https://www.nhl.com/tv Breaking news, scores, stats, analysis & real-time highlights: https://www.nhl.com Feeling social? Twitter: http://twitter.com/nhl Facebook: http://facebook.com/nhl Instagram: http://instagram.com/nhl Číst dále >>>

Natural, cost-efficient and eco-friendly – are you giving cloth nappies a go? They are easy to use, great for baby’s skin, save you money... Číst dále >>>

A former Tesla engineer's lawsuit has accused Elon Musk's company of attempting to "silence" its employees. Číst dále >>>

Die Lage zwischen Washington und Teheran ist derzeit extrem angespannt, nun verschärft US-Präsident Donald Trump den Konflikt weiter: Er droht Iran indirekt mit der Vernichtung. Číst dále >>>