A generic antique reproduction sundial bought without consideration for it's exact positioning, like those often sold in garden centers, is worthless as a time keeper. For a sundial made for its exact lat & Long the answer is about two minutes. If you want one made see: http://www.merlinsundials.co.uk/ Or if you want to make your own see: http://www.Amazon.com/Clock-Accurate-Customized-Location-Northern-Hemisphere/dp/0879612460. I made my own and it's easier than it sounds. However a larger one used with correction charts could be accurate to the second. See: http://www.sunlit-design.com/infosearch/sundialaccuracy.php?indexref=1 In fact up until the turn of the 19th cent. the French railways still used what they called heliochronometers rather than clocks.
A sundial has to be positioned correctly in order to give you a good estimate of the time.
most of the time you would want it to be accurate and reliable but sometimes it doesn't it.depends on what the subject is
The glassware that provides the most accurate measurement of volume is the measuring cup. A glass measuring cup has lines on it to give an accurate reading.
its definitely not a clock...or a sundial...its a metronome!
AnswerAll digital clocks are perfectly accurate! A strontium atomic clock developed by scientists at the University of Colorado is supposedly more than twice as accurate as the cesium atomic clock (the old "most accurate") was.Atomic clocks are the most accurate clocks that are available to the general public. To date, the most accurate clock made is the so-called quantum logic clock, which is accurate to about one second in 3.7 billion years.
In the sunlight.
If the sundial is correctly aligned (at Polaris) with a nomon angled to the same amount as your latitude. Then the time it shows will be accurate (showing solar time - GMT adjusted for your longitude). Assuming it is a proper sundial and not a garden ornament.
A sundial is a way to tell time without a clock. It uses the sun and positions of shadows to tell the time. These are fairly accurate.
A sundial doesn't work at night A sundial doesn't work when the sun is hidden - by clouds, buildings, etc. A sundial only works at the latitude it is designed for - a sundial built for Ecuador woudl not be accurate in New Zealand.
The gnomon of a sundial is cut to a certain size depending on the latitude of the sundial's location. If the gnomon is not of the correct size, it can be compensated for by raising or lowering the lower edge of the sundial until all times are accurate. Calibration is fairly simple. Using a precise time measurement, when it is noon, go outside and position the sundial so the shadow of the gnomon is on noon on the sundial. Check it again at 1 pm, and adjust as needed.
The sundial device was and is a very accurate tool of measuring units of time. The sundial devices uses the sun to pinpoint exactly what time it is because of where the shadow falls.
Yes, but it would be difficult, as the markings on a sundial must firstly be measured very accurately (the markings are not evenly spaced) and tend not to show particularly low figures. However, theoretically, it would be possible - just find an accurate enough sundial.
I have a sundial in the garden.The sundial were the earliest form of clocks.
Multi blade on many sides with months, days, hours and sloping speared globe above many sided sundial
because there is more sun light
He used a portable sundial.