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Poppy's message to you This week:
Poppy's message to you This week:
Research Material
Research Material
QUESTIONS To KEEP IN MIND:
QUESTIONS To KEEP IN MIND:
- What does a sundial have to include, physically?
- How do you 'set' the sundial so that it shows the correct local time?
Telling the time with shadows
Telling the time with shadows
Before humans had watches, they turned to the sun in order to measure the units of the day. The sundial is the earliest timekeeping device.
The very first example was most likely the Gnomon, which was invented around 3500 bce.
Today, we refer to the pole/rod of a sundial as the gnomon.
IMAGE: Sketch of a Gnomon
Time zones
Time zones
Finding the local time for other parts of the world is easy nowadays.
Try this website: https://www.timeanddate.com/worldclock/
Longitude and latitude
Longitude and latitude
To understand how a sundial works, and how to build one, you first need to understand longitude and latitude.
To understand how a sundial works, and how to build one, you first need to understand longitude and latitude.
What is longitude and latitude?
What is longitude and latitude?
The people who made the very first sundials, understood that the Earth rotated on an axis, and that the shadows cast by the sun, were different in different parts of the world.
Watch the 'Dr. Nagler's Laboritory' video to find out what longitude and latitude is.
VIDEO: Dr. Nagler's Laboritory: Longitude and Latitude
Latitude and Sundials
Latitude and Sundials
Designing a sundial for the North Pole is very simple! Move to places in other latitudes, and the task becomes trickier.
Watch the video 'Sundials and Latitude' to find out what you need to consider with latitude, when making a sundial
VIDEO: Sundials and Latitude
How to find the longitude and latitude of a place
How to find the longitude and latitude of a place
Try using a map coordinates tool, to find out the longitude and latitude of where Poppy lives.
Here are two such online tools:
Option 1: GPS COORDINATES AUSTRALIA
Option 2: Map Coordinates.net
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