7.1AncientAstronomy(Pages271-276)

HOMEWORK:1. Readpg.271-2762. 7.1Worksheet(#1-10)

Video:AncientAstronomyPartIhttps://www.youtube.com/watch?v=l3hzpxMcldQVideo:AncientAstronomyPartIIhttps://www.youtube.com/watch?v=o-9m44Uj9AAVideo:HubbleTelescopehttps://www.youtube.com/watch?v=oAVjF_7ensg

Learning Goals

• I can explain how ancient peoples benefitted from studying the sky.

• I can explain how ancient clocks work.• I can explain how ancient peoples

determined that the Earth is spherical.

What is Astronomy?

• CREATE A WORD WEB– Use as many words that you can think of that

relate to astronomy…

LETS MAKE A WORD WEB!!

Early Astronomers

• Astronomer: a scientist who studies astronomy, which is the study of the night sky

• Early civilizations studied the sky• Benefits of studying the sky

– Creating accurate calendars– Predicting the seasons– Predicting important events– Navigating over land and water

WHATS OUT THERE?

Celestial Objects

• Celestial object: any object that exists in space, such as a planet, a star, or the Moon

HOW IS TIME MEASURED?!

Calendars

• Calendar: a way of showing days, organized into a schedule of larger units of time, such as weeks, months, seasons, or years; usually a table or a chart

• Ancient peoples (i.e. Aztecs) used patterns in the positions of celestial objects to create calendars and predict important events

HOW LONG DOES IT TAKE FOR EARTH TO GO AROUND

THE SUN?

WHAT IS A LEAP YEAR?

The Year

• Revolution the time it takes for an object to orbit another object

• Earth’s revolution around the Sun is 365.24 days

• Every four years, an extra day is added in February to account for the accumulation of the quarter days à Leap year

THEN HOW DO WE GET OUR SEASONS?

Early Clocks• Rotation: the turning

of an object around an imaginary axis running through it

• Day à The average time it takes for Earth to make one rotation on its axis

• Ancient peoples used shadows to tell the time of day

Evidence for Earth’s Spherical Shape

2. The appearance of the sky changed as travellers journeyed farther north or south.

1. The hull and then the masts of ships appeared to descend below the horizon as ships sailed away.

3. During a lunar eclipse, the shadow of Earth on the moon was curved.

Fixedpatternsofstarsinthenightskyhelpedpeoplenavigateonlandandinwater.Polaris– TheNorthStar

Cause Effect

Earth’s rotation on its axis cause…..

Earth’s revolution around the Sun causes….The Moon’s gravitational pull on Earth causes….

Earth’s tilt on its axis causes….

The Sun’s gravitational pull on Earth causes…..

day and night

yearly periods

ocean tides

the seasons

Earth’s orbit

Practice

• Read Textbook (271-276)• 7.1 Worksheet (#1-10)