Slide 1

Earth Sun Relations GPH 111 Slide 2 What we will cover: Where earth is in relation to the universe Earths rotation and revolution Terms important to earths orbit How earths tilt defines much about our climate Where earth is in relation to the universe Earths rotation and revolution Terms important to earths orbit How earths tilt defines much about our climate Slide 3 Lets start with the Sun >91 million miles from Earth 11,000 F surface temperature 98% of total solar system Can hold ~1.3 million Earths Slide 4 The rest of the solar system Slide 5 Slide 6 Where is the Solar System? Our sun is one of 100 billion stars in our Galaxy Slide 7 Where is our Milky Way Galaxy? http://www.seds.org/messier/Jpg/m31.jpg Our galaxy resides with roughly 22 other galaxies of comparable size in what is known as the Local Group. This is Andromeda the largest galaxy in the Local Group. Slide 8 How about the Local Group? http://www.seds.org/messier/Pics/Jpg/virgo.jpg The Local Group of galaxies are beginning to merge with the Virgo Cluster that has over 1,000 galaxies, each with roughly 100 billion stars. Slide 9 Alright, so how about the Virgo Cluster? Virgo cluster is part of a super cluster of galaxies with over 100,000 galaxies, the largest structure in the universe. (Image courtesy of NASA) Slide 10 Slide 11 OK, enough of that, lets get closer to home Slide 12 Earths motion Copy Board Globe Earth-Sun Model Students and Globes Movie Diagram Slide 13 Earth revolves around the sun Slide 14 The midnight sun Where and when could this photo have been taken? Slide 15 1)Label important latitudes by name and degree on one of the Earths 2)Label the solstices and equinoxes (include dates) 3)Label which latitude the sun is directly overhead on these dates 4)Label where on the planet (for each season) that is experiencing 24 hours of daylight / darkness and 12 hours of daylight and darkness Show Movie! 66.5 S Antarctic Circle 23.5 S Tropic of Capricorn 0 Equator 66.5 N Artic Circle 23.5 N Tropic of Cancer Slide 16 Earth Sun Relations 66.5 S Antarctic Circle 23.5 S Tropic of Capricorn 0 Equator 66.5 N Artic Circle 23.5 N Tropic of Cancer 23.5 S Tropic of Capricorn 0 Equator Fall Equinox 9/21 Equal Daylight and Darkness Spring Equinox 3/21 Equal Daylight and Darkness Winter Solstice 12/21 24 hour darkness 66.5 N 24 hour daylight 66.5 S Summer Solstice 6/21 24 hour darkness 66.5 S 24 hour daylight 66.5 N Slide 17 Solar energy distribution on Earth Slide 18 Things to know Facts about the sun Names and number of planets in the solar system Number of stars in the Milky Way Galaxy Number of galaxies in the local group DIAGRAM AND LABEL EARTH SUN RELATIONS Where on our planet receives the most energy? Where receives the least? (at the top of the atmosphere) Help: Chapter ES 1)Sketch the diagram Label important latitudes by name and degree 2)Label the solstices and equinoxes (include dates) 3)Label which latitude the sun is directly overhead on these dates 4)Label where on the planet (for each season) that is experiencing 24 hours of daylight / darkness and 12 hours of daylight and darkness