Understanding Scale Earth In Space Is the huge Earth really that big when compared to other things in our solar system?

Sponge Wed. 3/10/10 Sponge Guide - Start Each Sponge with Date - Neat to Read - Use lines as guide - 4 Sentences - No ‘junk’ sentences

Sponge Wed. 3/10/10 Draw and label the , , & . Draw the ‘s and ’s Orbits. Label each with “The _____’s orbit around the ______ takes ______ days” Draw how the and rotate. Label the rotations with “The ______’s rotation around _______ takes _____ days.”

Earth The Earth’s orbit around the Sun takes 365.25 days (365 ¼ days). The Earth’s rotation around itself takes 1 day. Q: What is a Solar Year?

Moon The Moon’s orbit around the Earth takes 27.3 days. The Moon’s revolution around itself takes 27.3 days. What is a Lunar Calendar?

Lunar Calendar Only one used today is the Haji Used for Islamic Religious purposes Cultures that used to use it Chinese Hebrew Hindu Based on Phases of the Moon. Each month is one moon cycle. Q: How many days in a Lunar Month? Q: What are the effects?

Lunar Calendar Q: How many days in a Lunar Month? 27.25 days Q: What are the effects? - A Lunar Year is only 354.7 days long - Not linked to Seasons - Drifts each Solar Year by 11 days - Takes 33 Lunar Years to come back in position with a Solar Calander

How is Earth different from other planets? What can we learn about Earth by studying the Solar System?

Name the planets challenge.

Sponge Thursday 3/11 Radius Diameter Circumference Part 1: Make this table and complete it. Measurement Definition Radius Diameter Circumference Part 2: What imaginary line around the Earth is used as the measurement of its circumference?

Sponge Thursday 3/11 d =2xr r = C / 2π C = 2rπ Radius Diameter Measurement Calculation Definition Radius r = C / 2π Diameter d =2xr Circumference C = 2rπ

Sponge 3/11 add Part 2: What imaginary line around the Earth is used as the measurement of its circumference? The Equator Earth’s diameter = 12742 kilometers What is the length of the equator?

Quick Problem C = 2rπ C = 12742 km x π C = 12742 km x 3.14 = 40,010 km Earth’s diameter = 12742 kilometers What is the length of the equator? C = 2rπ C = 12742 km x π C = 12742 km x 3.14 = 40,010 km (24,800 miles) 2r = d = 12742 km

Scale What does it mean when something is “Built to Scale” or “Not Drawn to Scale”?

For every 1 unit of the model there are 18 units of the real. A scale model is a reduced size model in all aspects. Scale is Relative Size Scale is shown by a ratio Example: 1:18 scale For every 1 unit of the model there are 18 units of the real.

What scale does the model represent? 12 foot Real 1 foot Model 1:12 scale Foot

What Scale is Mini Me Model 3 ft Real 6 ft

Scale can also be . . . 1:30 Scale 0.0333 1/30th 3.33%

Earth Units The Diameter of the Earth makes an easy to understand measurement We can compare it easily because we have a good gauge / idea of the Earth Diameter - the measurement is real to us I can think in “Football fields”.

Powers of 10 101 = 10 102 = 100 103 = 1,000 104 = 10,000 Powers of 10 video link

Sponge Friday 3/12 Does a toy top ‘revolve’ or ‘rotate’? Why do the sun and the moon look the same size? Have you ever seen a Solar System drawn to scale (both size and distance)? How many Earth Diameters is the distance between the Earth and the Sun?

Index Card Quiz How many Earth days are in one Moon revolution? How long is one Earth Revolution? How long is one Earth Rotation? My model ship was made on a scale of 1:25 . The model is 3 feet long. How large would the real ship be?

Index Card Quiz (7 Questions) 5. My model ship was made on a scale of 1:25 . The model is 3 feet long. How large would the real ship be? 6. How many Earth diameters can fit across the Sun (Sun Diameter). 7. Bonus How many Moon diameters can fit across the Sun (Sun Diameter)?