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Sundial
By
Nattawin Chompooteep (5861074)
Aticha Chanopas (5861006)
Wina Montian (5861183)
Chanon Anektanasup (5861016)
Thanon Thamvorapol (5861060)
Kanin Jaroensattayatham (5861045)
Astronomy
Mr. Gopinath Subramanian Mahidol University International
Demonstration
School
Semester 1 Academic Year 2017-2018
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Table of Contents
Abstract…………………..…………………………….……….………..………….……….…….……….……………..………..
2
Objective…………………..…………………..…………………………….……….…………….………..…………………..……….3
Introduction (Background
information)………………….……….……….…….…..………………….4
Advantages and
Disadvantages…………………..………….…….………….……….…..……………………….5
Materials…………………..……………………..………….…………………..…….………….……….….………………………..6
Procedure…………………..……………………………………….…………………….……….…….……………..……………………..7
Pictures…………………..………………………………………………….………….……….………….……….……….…………..8-10
Results……………………………………………………………..………………….……….……….…….…….………………….…………11
How sundial
work…………………………………………………………………….……….……….…….………………..…………12
Recommendation……..…………………..………………………………….………..…….……….………...…………….
13
Fact about
sundial……..…………………..……………………..…….……….….……….……….…..…………….14
References…………………..…………………..…………………………….……….…….……….……………….…………………15
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Abstract
This project includes the creation of a sundial, which is a
device used to indicate time within a day while using the sunlight
as a tool. From this project, a sundial was created successfully,
incorporating the knowledge about the fact that planet Earth
rotates about it ownself and with the rotation, the position of the
sun that is visible to the eyes of human changes with our own
creativity in the process of working on the project. Moreover, the
techniques mentioned in class such as the accuracy of angles and
scales were applied in our final product.
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Objective
The objectives of this project are to know the concept that the
earth move around the sun in an ordinary fashion, to understand the
history of sundial, to understand the function of sundial and apply
the astronomical lesson to real life.
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Background Information
We might notice that when we arrive at school in the morning,
the sun that shines on one side of the school, and in the afternoon
when we leave the school, the Sun shines on the other side. This
phenomenon occurs because of the Sun movement that moves across the
sky.
In the age that clocks are not created, people determine the
time via the movement of the Sun, resulting in constructing
sundials. Sundials are simply motionless vertical object such as
pole that placed on a flat surface. For sundial, the pole is
gnomon, and the flat surface is the dial. Coincidently, when the
Sun moves toward the sky, the expansion and position of the shadow
cast on the dial by the gnomon will be distinct. During the sunrise
and sunset period, the shadow is most extended. On the other hand,
the during local noon, the shadow is shortest.
Within this project, we will construct a sundial and determine
the given time. Moreover, we will compare the time that we find
from the sundial with the time that occurs on our watch or
phone.
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Materials
1. Plywood
2. Saw
3. Glue
4. Papers
5. Permanent Markers
6. Acrylic Colors
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Procedures
1. Making Sundial a. Making the plan b. Assign the members role
c. Get the materials d. Use the saw to cut a plywood into a
circular shape e. Use the Acrylic Colors to paint the face of the
clock f. Measure the degree g. Place the number on the face of the
wood h. Stick the numbers on the wood i. Cut another wood into a
triangular shape for a gnomon j. Stick the gnomon on the wood
2. Testing the Sundial
a. Place the sundial by facing the gnomon to the north b.
Observe the shadow whatever the shadow leads to on the dial c.
Compare the time that get from the sundial and the actual time d.
Take note the result
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Results
Our group place a sundial by the gnomon facing to the
north at half-past eleven. The result came out rather accurate as
the shadow that shows in the sundial is the same as the time in our
phone.
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How sundial work The Earth is rotating around itself as well as
orbiting around the
Sun, this makes the sun look like moving across the sky and
having cast shadow. A sundial consists of gnomon; a thin rod which
sticked on a half circle platform labelled with different time
period. As the Sun changes position over time in a day, the shadow
casted from rod will change its position indicating the current
time. The calculation of sundial clock due to the sun is not
relatively straight from Earth as well as the Earth’s tilt of 23.5
degrees. Also, the Sun is not in the same position across the
Earth, so it is very important to make the sundial well calculated
in order to indicate correct time. (Yale Scientific,22 Nov
2008)
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Recommendation The hour and minute marking should be more
precise, citing
more time frame for a better result at reading the time.
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Fact about Sundial
1.) Sundial are are in use since ancient times until early 19th
century.
2.) The sundial is one of the world’s oldest scientific
instruments.
3.) When the Sun position is highest at midday the shadow length
will be short and when the position is lower in the sky, shadows
are longer.
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References
BLATEYRON, F. (n.d.). Understanding sundials. Retrieved November
03, 2017,
from https://www.shadowspro.com/en/sundials.html
W. (2017, October 23). How to Make a Sundial. Retrieved November
03,
2017, from https://www.wikihow.com/Make-a-Sundial
Facts About Sundials And Shadow Clocks. (2016, November 19).
Retrieved November 09, 2017, from
http://someinterestingfacts.net/facts-sundials-shadow-clocks/
Yale Scientific. (22 Nov 2008). How do sundials work? Retrieved
at 6 November 2017, from
http://www.yalescientific.org/2008/11/how-do-sundials-work/
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https://www.wikihow.com/Make-a-Sundialhttp://someinterestingfacts.net/facts-sundials-shadow-clocks/http://www.yalescientific.org/2008/11/how-do-sundials-work/