This lesson has you continue playing ** Odyssey** and takes a look at some of the concepts featured in the game.

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This lesson has you continue playing ** Odyssey** and takes a look at some of the concepts featured in the game.

**Theory**: This lesson has the students continue playing*Odyssey*and introduces new astronomical themes and concepts.**Play**: The students play the game, reading and solving the astronomy-themed puzzles.**Share & Discuss**: These tasks focus on the key people and concepts of astronomy.

**The Solstices**are either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.**Planets**are celestial bodies orbiting a star.**Ptolemy**was a Greek writer, known as a mathematician, astronomer, geographer and astrologer.**Almagest**is a scientific book by Ptolemy, concerning mathematics and astronomy.

Use your own sources and the ones below to teach the slide’s concepts to your students:

**READ:**

- Time and Date: Summer Solstice
- Time and Date: Winter Solstice
- Space.com: Solar System Planets: Order of the 8 (or 9) Planets
- ThoughtCo: Essential Facts About The Planet Earth
- Forbes: The Curious Case of Planetary Orbits
- University of St. Andrews: Ptolemy Biography
- Khan Academy: Ptolemy
- Famous Mathematicians: Ptolemy
- ThoughtCo: Claudius Ptolemy: Father of Astronomy and Geography
- Encyclopedia of World Biography: Ptolemy
- Professor David Blitz: Ptolemy’s Almagest (the actual book in English)
- Encyclopaedia Britannica: Almagest
- Wikipedia.org: Almagest

Image Source: *Helix Nebula*, Wikimedia Commons.

**Copernicus**Nicolaus Copernicus was a Renaissance- and Reformation-era mathematician and astronomer who formulated the**heliocentric model**.**Parallax**is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.**Geocentrism**is the (false) model that has the Sun revolving around the Earth.

Use your own sources and the ones below to teach the slide’s concepts to your students:

**READ:**

- Biography.com: Nicolaus Copernicus (also includes 3 min video)
- BBC History: Copernicus
- Space.com: Nicolaus Copernicus Biography
- Stanford Encyclopedia of Philosophy: Nicolaus Copernicus
- Famous Scientists: Nicolaus Copernicus
- The Galileo Project: Nicolaus Copernicus
- Dictionary.com: Parallax
- Wikipedia.org: Parallax (with excellent examples)
- Universe Today: What is the Geocentric Model?
- Khan Academy: The Geocentric Universe
- Khan Academy: The Heliocentric Model

**WATCH:**

- YouTube: Parallax Scrolling (1 min, great way to demonstrate how parallax works)

Image Source: *Cosmic ‘Winter’ Wonderland*, Wikimedia Commons

Play ** Odyssey!** Remember to read the journal to understand how to solve each puzzle.
Remember also to check your inventory if you are stuck.

**Students having trouble? Click here to download the solutions to the puzzles!**

To begin playing, click on **New Game**.

To continue a previous game, click on **Continue**.

- How far along did you get?
- Did you have any problems with a specific puzzle? Which one?
- Did you get stuck at any puzzle? Which one?

- What is a solstice?

Either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.

- Who was Ptolemy?

A Greek writer, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. Ptolemy's *Almagest* is the only surviving comprehensive ancient treatise on astronomy. (source)

- Who was Copernicus?

Nicolaus Copernicus was a Renaissance- and Reformation-era mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at the center of the universe. (source)

- What is parallax?

The effect whereby the position or direction of an object appears to differ when viewed from different positions, e.g. through the viewfinder and the lens of a camera. "what you see in the viewfinder won't be quite what you get in the photograph because of parallax error" (defined by Google)