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The position of the shadow at a given time of day will vary slightly with the seasons. For example, if at 2:00 p.m. on 31 August the shadow is exactly on the 2, at 2:00 p.m. on 31 October it will be off a little.
Of course for a sundial to be mostly correct most of the time, it has to be positioned according to where it is in the world. And of course, it will never take into account the fact that (in some countries) we switch to Daylight Saving Time part of the year.
Here's an improved answer: Sundials are inaccurate for 3 reasons :
1) There's obviously the difficulty of getting an exact reading for "minutes"
using are relatively crude device like a sundial.
2) Sundials measure "apparent solar time". Clocks use "mean solar time".
"apparent solar time" varies a bit during the year because of the Earth's orbit and axial tilt. "Mean solar time" averages out these differences to give us a day of exactly 24 hours. So, a correction needs to be applied to get from the time the sundial shows to the time on a clock.
3) The other correction that's needed is for your longitude within your particular time zone. (Also "Daylight Saving" has to be allowed for, of course.)
This adjustment is not really because the sundial is inaccurate, but it is needed to get to the standardised time shown by a clock.
What else can I help you with?
What type of measuring device is Cogsworth in Beauty and the Beast?
A time measuring device. Also known as a clock
How much of The Help is inaccurate?
approx 11.37% of The Help is inaccurate
Why must sundials being used in the northern hemisphere be reversed in the southern hemisphere?
During northern hemisphere summer the sun is in the northern sky in the southern hemisphere. Our sun in the northern hemisphere is almost always in the southern sky unless your south of the tropic of cancer so this is why you have to reverse the sundials if you move to the southern hemisphere.
The following are all problems with measuring the money supply?
Measuring the money supply can be problematic due to the varying definitions of money, such as M1 and M2, which can lead to confusion about what constitutes "money." Additionally, the rise of digital currencies and financial innovations complicates traditional measurements, as they may not be fully captured in standard metrics. Furthermore, the presence of informal or shadow banking systems can obscure the true amount of money in circulation, making accurate assessment challenging. Lastly, data collection methods may be inconsistent or lag behind real-time changes in the economy, resulting in outdated or inaccurate figures.
Why did it take 73 years to discover the titanic?
The technology wasn't very good at the time and Titanic's sinking location was very inaccurate. Someone also has to fund the program and use all sorts of technologies to detect Titanic.
What were sources of measuring time in past?
Some sources for of measuring time in the past were sundials, and hourglasses
What were the time measuring devises used in ancient times?
sundials
What are bad things about sundials?
They are very inaccurate at night and most aren't designed to fit on the wrist.
Why do sundials need to be adjusted?
we have to adjust sundials to see the shadow and time
Why were sundials used?
Sundials were used to tell time, back without watches.
What is the purpose of the sundials device?
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.
What are the bad things about sundials?
Sundials are not as accurate as modern timekeeping devices due to variations in the position of the sun throughout the year and changes in daylight saving time. They also rely on clear skies and sunlight, so they are not effective during cloudy or nighttime conditions. Additionally, sundials can be impacted by shading from buildings or trees, affecting their functionality.
What is the disadvantage of elastic measuring tape?
One disadvantage of elastic measuring tape is that it can stretch over time, leading to inaccurate measurements. Additionally, elastic measuring tape may not provide as precise measurements as a rigid measuring tape.
How does measuring shadows help us determine what time of day it is?
Measuring shadows is useful for determining time of day because the length and direction of a shadow change based on the position of the sun in the sky. By measuring the length and direction of a shadow cast by an object, we can estimate the angle of the sun and roughly determine the time of day. This method is commonly used with tools like sundials.
When the Romans used sundials how could they tell the exact time on rainy days or with no sun?
They couldn't tell the time from sundials because there was no sun.
How did the aincient egyptians measure time?
Sundials
How accurate are sundials in measuring time?
Generally accurate to within a few minutes. (They do not take account of Daylight Saving Time.) However, you need to apply some corrections to get to "clock time". Clock time uses "mean solar time". That's an average of the "apparent solar time" (as shown by sundials) during the year. You need to apply the "equation of time", for the day of the year, to get from "sundial time" to "mean solar time". Then you need to make a correction for your longitude, within your particular time zone.
