Topic 4. How do we determine a frame of reference for time? A)Day – based upon one rotation of the Earth on its axis B)Month – based upon the length of.

Slides:

Advertisements

Similar presentations

Advertisements

Title of book Written By:

Chapter S1 Celestial Timekeeping and Navigation

Actual Earth Motions.

27.3 – Sun-Earth-Moon System

Sun/Moon/Earth Study Guide Answers

Aim: How are time zones created?

Time Zones CGC1D.

Topic 4 Motions of the Earth, Moon, and Sun

Apparent Motions of Celestial Objects

January 17, 2006Astronomy Chapter 3 Earth, Moon, and Sky How do we locate objects in the sky? How are seasons and tides related to astronomy? What.

Latitude & Longitude.

Time Zones.  The Earth is currently divided into 24 major time zones so that everyone in the world can be on roughly similar schedules (noon being roughly.

Time Zones The World is divided up into 24 time zones. Each time zone is approximately 15 degrees of longitude wide. The time within each time zone has.

RRB PAGES Local Time and Time Zones. Solar Noon and Time Zones Solar Noon: when the sun is at the highest point in the sky. This may not be the.

26.2 Movements of Earth.

EARTH’S ROTATION CHAPTER 4.2. Objectives Give evidence of Earth’s rotation. Give evidence of Earth’s rotation. Relate Earth’s rotation to the day- night.

Astronomy Revision Booster Topic 1. Eratosthenes calculated the circumference of the Earth using a shadow stick Earth Diameter = 13,000km Time to rotate.

Do Not Write What is in Yellow APPARENT MOTIONS OF THE CELESTIAL OBJECTS.

Chapter 1: The Cycles of the Sky

THE MOON. REVOLUTION AND ROTATION Relative to stars, Moon moves eastward by about 13° per day. Eastward motion is faster than that of Sun; meaning Moon.

Bell Question Define the following terms: 1. Rotation 2. Revolution 3. Precession 4. Nutation Answer the following question: 5. What would happen if the.

Chapter 5 Lesson 2 “Earth and the Sun”. How Do We Know Earth is Rotating? The Sun only seems to move because the Earth is rotating or spinning.

Unit 4 Motions of Earth, Moon, and Sun. Apparent Motions of Celestial Objects Apparent Apparent motion is the motion an object appears to make. Can be.

4.2 E ARTH ’ S R OTATION DAHS Mr. Sweet 1 O BJECTIVES Give evidence of Earth’s rotation. Relate Earth’s rotation to the day-night cycle and the time.

4.2 Earth’s Rotation Rotation Earth spinning on its axis

The Moon and Moon Phases

Movements of the Earth The Earth’s Motion in Space.

Motions of the Earth Ch Rotation the turning, or spinning, of a body on its axis. Two measurements for rotation Mean solar day is the time interval.

Longitude and Time.

1 Lecture 29 Measuring Time on Earth Ozgur Unal. 2  What time is it in your hometown at the moment?  What time is it in NYC?

The Solar System. The Earth Moves The Earth rotates. The side of the Earth that is facing the sun has day. The Earth revolves around the sun. One revolution.

TIME ZONES – IT’S A TRIP! Watch it! (3 minutes)

SPACE SCIENCE REVIEW. Category 1 Category 2 Category 3 Category 4 Category 5 Category A B C D E A B C D E A B C D E A B C D.

Earth and Its Moon. Movement of the Earth in Space A.The Earth’s Rotation: the turning of the Earth on it’s axis. * axis – the imaginary line from the.

Time Zones in early days everyone set their clocks according to the sun - it was noon (12:00 p.m.) when the sun was at its highest point (its "zenith")

Equinox by zoe closs-lopez p.7 noun- the time when the sun crosses the plan e of the earth's equator, making night and day of approximately equal length.

Lesson 2 Notes Tracking Shadows. Vocabulary Gnomon – shadow stick used by the Ancient Greeks to help them tell time Solar noon – time of day when the.

Earth and the Sun Science Ms. Arce. Vocabulary Rotation – a complete spin on an axis International Date Line – the 180° line of longitude. If you pass.

Do Now Estimate what time the sun rose this morning Estimate what time the sun will set today What has been happening to the hours of daylight?

Chapter S1 Celestial Timekeeping and Navigation

How does the geocentric model differ from the heliocentric model?

MODELS OF THE EARTH.

Why does the Sun appear to move across the sky?

Mapping: Locating Positions on Earth

The Earth The Earth is the third planet from the Sun.

Earth's Dimensions Profiles Topographic Maps Latitude Longitude

The Sun-Earth-Moon System

FACTS ABOUT THE EARTH, THE SUN AND TELLING TIME

Astronomy – The study of the motions and properties of objects in space.

Which city receives the most constant insolation year round?

TIME ZONES Unit 1.

-Time is based on longitude lines.

Moon Notes Chapter 12.

Chapter 2 – Mapping Our World

EARTH'S MOTION.

The Reasons for Seasons

How Do We Use Earth’s Motion to Determine the Length of a Day?

Chapter 14 Section 2 What are time zones?

EARTH'S MOTION.

Chapter 14 Section 2 What are time zones?

Presentation transcript:

Topic 4

How do we determine a frame of reference for time? A)Day – based upon one rotation of the Earth on its axis B)Month – based upon the length of one complete cycle of the Moon’s phases C)Year – based upon one revolution around the Sun.

What is local time? Local time is measured by a sundial. The position of the shadow provides the time. Therefore the time is based upon the rotation of the Earth as reflected in the motions of the Sun. All locations on the same line of longitude have the same local time.

How does local time change as one travels east? west? Local time changes as you travel east by getting 1 hour later every 15 degrees. Local time changes as you travel west by getting 1 hour earlier every 15 degrees.

What is solar time? Solar time is a type of local time based upon the Sun. Solar noon is when the sun is at its highest point in the sky.

What is mean solar time? Mean solar time is based upon the averaged length of a day. The length of the day will change because Earth’s speed around the Sun varies.

What are time zones? Time zones are 15 degree wide bands that have been established to standardize time for similar regions. There are 24 separate time zones.

What happens are you cross over the International date line going east? west? When you cross the international date line going east to west you add one day ex: Sunday  Monday When you cross the international date line going west to east you subtract one day ex: Monday  Sunday