Sally Ride Elementary is a relatively new school. In 2018 Cypress Park and Durance Elementary schools merged into a new and beautiful school. The old buildings and exterior areas were demolished and what used to be the old Cypress Park, became into the nowadays amazing and very modern school. During this construction process, the once built by Sun for You and Me club’s students school sundial was destroyed.
It was then, necessary to build a sundial, which could make us all very proud of. Under Ms. Berriz’s direction, the sundial was redesigned and recalculated. We have learned with her how to build a Horizontal Sundial and many basic concepts that will help us not only to better understand how a sundial works but also to master different Science and Math standards. The team has been working hard. Students and volunteers from the whole school have helped us with this project. These are some images that show the whole process.
What is behind this project?
Students and teachers, from Kindergarten to 5th grade, we all have learned about sundials!
How can we classify the sundials?
- Vertical equatorial sundial.
- Horizontal equatorial sundial.
- Vertical sundial. (One of most popular)
- Horizontal sundial. (One of most popular) This is the sundial that we learned about and the one that we are building for this project.
- Vertical sundial with Azimuth.
- East and/or West sundial.
- Pyramid sundial
- Circular sundial.
We don’t know how to build all these sundials, but the horizontal one we can explain to you!
How can we calculate a sundial?
|Type: Horizontal Local Sundial|
|Place: Orlando, Florida, USA|
|Latitude f=28.5º||Longitude l=81.3º|
|Azimuth g=0º||Inclination a=61.5º|
|DY= AY.Bg.Bb=6.29||DX= AX/ Bg=1.43|
This data was used for the design and calculation of the horizontal sundial built in Orlando, USA, by students from the Sally Ride Elementary school
In the diagram are represented the time lines for the school’s local latitude (28.4 degrees to the North) and longitude (81.21 to the West). The gnomon ( on the left side) has the inclination angle equal to the local latitud. If we could prolong that line for 434 light-years, we will meet the Pole star. This line indicates the real North. (See the Glossary/ Pole star)
How was designed the sundial?
The design was discussed by the team, Ms. Berriz, and Ms. Torres, our Art teacher. It represents our school. Sally Ride Elementary school is proud of having the Aviation & Aerospace Magnet Program. The sphere of the sundial was painted by students from VPK to 5th grade. The gnomon was donated to us by SignWrap Xpress.
Who participated in this project?
From the very beginning, our purpose was to involve as many people as possible and we did it! Several adults supported us in many different ways: donation of materials and tools, working with the concrete part, and during the painting part of this project. The list includes scholars from VPK to 5th grade (375 students), our Sally Ride school staff, the community, local stores, friends, and families. We could round the number of participants to about 450 persons. It was that big!!! We appreciate the unique and very valuable support that we have had.
To name just six participants, based on this competition requirements, here we have them in the same order as they appear in the video below:
Adelina, Brendon, Neil, Kensleigh, Alex, and Sasha.
Let’s listen what the experts have to say. Enjoy the video.
Now is the Sun’s turn to show the solar time in our schoolyard.
Gnomon– A rod parallel to the Earth’s axis of rotation (Polar North-South axis) that shadows a given plane where time-lines are represented.
Horizontal Plane – Plane of the local horizon where the cardinal points are located.
Local Latitude – Coordinate used to determine the location of a particular point on Earth. The latitude of a given place is the angle that having as a vertex the center of the Earth forms that place with the equatorial plane.
Local Longitude – Angle formed between the meridional plane 0 (passing through Greenwich) and the local meridional plane or cenital plane.
Meridian– One of the coordinates used to define the position of a point on Earth and is the cutting line of a southern plane with the Earth’s sphere. The meridian of a place defines its length, that is, its distance to the zero meridian, located in Greenwich, and at the same time defines the solar time.
Meridional Plane – Plane passing through a given place and the Axis of Rotation of the Earth, i.e. Polar North-South Axis. By international convention, the meridional plane passing through the Greenwich Laboratory in England is the zero meridian. As the Earth takes a full turn every 24 hours, each hour corresponds to an angle of 15 degrees. These meridional planes are called remarkable meridional planes or planes of longitude. The reference starts from the meridian zero or Prime Meridian (see Fig. 1).
North, South, East and West – Cardinal points of a given location. They are measured and represented on the horizontal plane of the place.
Northern Hemisphere and Southern Hemisphere – The equatorial plane divides the Earth into two hemispheres, the Boreal or North and the Southern or South.
Official noon – It’s called official noon at 12 a.m. by the official time.
Official time – Time that for convenience takes a country to organize its activities that usually refers to a meridian of longitude.
Pole Star – Star that is on the same axis of rotation of the Earth and therefore remains in the same place when the Earth rotates. It is used to determine the Polar North, that is, the cardinal points. Pole Star, also known as North Star or Polaris, forms with the horizontal plane an angle equal to the latitude of a given place.
Sundial – Clock that gives the real or true-time by changing the shade that the Sun gives on a certain surface.
True-time – It’s the time that gives the meridional plane where the Sun is located.
True noon – It’s called true noon at the moment when the Sun is at its highest point in the celestial sphere, that is, at 12 a.m. solar or true time.
This website and its content was approved by Ms. Berriz.