PPT-Time Zones Astronomy Unit

Ch 42 Effect of Earths rotation Created based on the rate at which the sun appears to move across the sky Sun rises in the east amp sets in the west Earth takes 24 hours to rotate on its axis . Day One. the universe, astronomy and cosmology. Universe. – totality of all space/time, matter and energy. Astronomy. . – the study of celestial objects, space and the physical universe. Cosmology. What . country lies at 0°, 20° E. ? . (Pg. RA22). a. Sudan. b. . Gabon. c. . Uganda. d. . Democratic . Republic of the Congo. . Last Night’s Homework. Please take out your homework from last night.. Day 13. Early Timekeeping. Before the invention of clocks, people marked the time of day using the sun. Many used a sundial to tell what time it was.. The sun is not at the same place in the sky at various locations around the world at the same time, so a sundial was not really practical.. Path of the Sun between March 21 and March 22. If no axial tilt, motion of sun horizontal only - at noon every day, sun appears at highest point in the sky (culmination) only drifting slightly east against background of stars - represents Mean Sun that would travel on the celestial equator.. 9/11/17. Due . 9/18/17. 1. The eccentricity of a comet is 0.967. Its . semimajor. axis is 17.8 AU. What is its distance from the Sun at perihelion? Aphelion?. 2. An asteroid has a mean orbital radius of 4.12 AU. What is its period?. 7.3.spi.17. read and interpret a time zone map.. (Bloom’s Taxonomy level 6). Estimated Lesson Length: 1 day. Activating Strategy. Students will discuss with a partner why we see the Olympics at a different time then they do in London?. Longitude’s Role. Longitude plays the most important role in telling time. There are 360◦ of longitude (180◦ West and 180◦ East of Prime Meridian). Longitude lines are spaced 15◦ apart in both directions from the. Royal Observatory . Greenwich Mean Time (GMT). This is the universal time used for many things:. Air craft. Weather maps. Email. NASA Space Shuttles. This is the time at the prime meridian. Not affected by daylight savings . A . time zone. is a region that has a standard time throughout it. There are 24 times zones throughout the world. Why do We Need Standard Time?. Before the late 1800s, towns and cities would set their own times based on the sun. Rotation:. Rotation: is one complete turn around the Earth’s axis. Rotation causes day and night. Rotation. The earth rotates at a speed of 1000 miles per hour. It rotates from west to east. Earth's rotational axis points in the same direction relative to the stars, so that the North Pole points towards the star Polaris. Time Zones run in the same direction as longitude lines.. Each color is a different Time Zone. Vocabulary. A. . time zone . is a region of the earth that has the same time. There are 24 time zones.. Before the invention of clocks, people marked the time of day using the sun. Many used a sundial to tell what time it was.. The sun is not at the same place in the sky at various locations around the world at the same time, so a sundial was not really practical.. 1. Ancient Astronomy. Many ancient cultures took a keen interest in the changing nighttime sky. The records and artifacts that have survived until the present make that abundantly clear. . 2. Ancient Astronomy. Objective. Use . standard. time zones to . compare. times around the world.. Identify . eight. U.S. time . zones. .. Key Terms. solar noon: . time of day when the Sun is highest in the sky. . standard time: .