An astrolabe(star-taker) is an elaborate inclinometer, historically used by astronomers, navigators, and astrologers. Its many uses include locating and predicting the positions of the Sun, Moon, planets, and stars, determining local time given local latitude and vice-versa, surveying, triangulation, and to cast horoscopes. It was used in classical antiquity, through the Islamic Golden Age, the European Middle Ages and Renaissance for all these purposes. In the Islamic world, it was also used to calculate the Qibla and to find the times for Salah, prayers.Abu Ishaq Ibrahim al-Zarqali (Arzachel) of Al-Andalus constructed the first universal astrolabe instrument which, unlike its predecessors, did not depend on the latitude of the observer, and could be used from anywhere on the Earth. This instrument became known in Europe as the “Saphaea”. The astrolabe was introduced to other parts of Europe via Al-Andalus in the 11th century. And now if you’re a scientist (like me), you’re probably very interested in social trends in technological literacy, in general.Of course, on another level, these astrolabes are just downright beautiful, and they were valued for their aesthetic qualities when they were new – something you absolutely cannot say about a TI-82.
We have featured many different types of speakers here on Geeky Gadgets but glass speakers are definitely a first.Yeah, we’ve seen our fair share of glass speakers in the past, but it looks as if Greensound has hopped on the bandwagon at just the right time. In the past, these kinds of music makers were largely looked at as gimmicks, but the Floe series looks to offer a serious advantage over equally expensive conventional drivers. Put simply, audio is created at the base of each speaker, and it’s distributed up (and around) the pane with the lows coming from the bottom, the mids from the middle and the highs from the top. We’re pretending to ignore the fact that these things will probably be far outside the budget of every sect save for the affluent, but you can tease yourself by pressing play just after the break.
Most mobile phone chargers are not really chargers, only power adapters that provide a power source for the charging circuitry which is almost always contained within the mobile phone. They are notoriously diverse, having a wide variety of DC connector-styles and voltages, most of which are not compatible with other manufacturers’ phones or even different models of phones from a single manufacturer.There are also human-powered chargers sold on the market, which typically consists of a dynamo powered by a hand crank and extension cords. There are also solar chargers.You can check some of these here.