Year 3, Term 1: Satellites
Scope and sequence: Heliocentric model
explore night and day and seasonal changes in relation to
Overview: The Earth is a satellite which rotates on its own axis each day while revolving around the Sun each year. Students will come to see how this rotation causes us to experience night and day. The angle of the Earth's rotation combined with its revolution around the Sun is why we experience different seasons throughout the year. This unit also looks at mechanical satellites which are used for global communications.
Australian Curriculum (version 9.0)
"A student investigates regular changes caused by interactions between the Earth and the Sun, and changes to the Earth’s surface." (ST2-10ES-S)
"Students learn to describe the movement of Earth and other planets relative to the sun and model how Earth’s tilt, rotation on its axis and revolution around the sun relate to cyclic observable phenomena, including variable day and night length." (AC9S6U02)
Introduction to the topic
The central idea which runs throughout this unit is that a satellite is a moon, planet or machine that orbits a planet or star. 'Orbit' is a revolution around another object as distinct from rotation which involves spinning around its own axis. The following video (1:50) explains all of this in relation to night and day.
Why doesn't gravity cause the Moon to collide with Earth?
Brian Brondel - Own work, CC
By Willow W - Own work, CC
BY 3.0, https://commons.wikimedia.org/w/index.php?curid=3397590
Life is different at the poles
(Jacobs & Robin, 2016, p. 273)
The arrangement of these rocks on Wadawurrung country
mirrors the changing position of the setting Sun throughout the year.
The Heliocentric model
The Heliocentric model is the idea that the Earth revolves around the Sun (as opposed to the Geocentric model where the Sun revolves around the Earth). The Heliocentric model was very controversial during the Renaissance (15th and 16th centuries) and was a key ingredient in the Scientific revolution. However, the following video (2:16) featuring Eratosthenes (276 BCE – 194 BCE) shows how this idea was discussed much earlier.
The Coriolis effect
The following video (1:20) involves placing a glue stick on a spinning 'Lazy Susan' to demonstrate the Coriolis effect.
This animation (0:56) was made by a student in Year 6 and
it explains how satellites work.
How big is our universe? This video (7:05) by the
BBC shows just how big the universe is.