Slide 1

Earth in Space Section 1-1 P. 6 - 13 Slide 2 Astronomy The study of space. The study of the Moon stars and other objects in Space. Slide 3 Movement of Earth and Planets Rotation: When an object spins on its axis (like a top) 1 rotation = 1 day Earth 1 day = 24 hours Slide 4 Revolution The movement of one object around another. Orbit = path around the Sun 1 revolution = 1 year 1 revolution = 1 year Earth 1 year = 365 days Earth 1 year = 365 days Slide 5 Calendars Ancient Egyptians created one the first Calendars. They had about 365 days in a Year. The Month is based on the Moon Cycle. 29 days. Romans had a Calendar with 365 Days 365 days? - Leap Year Slide 6 Seasons The Earth has seasons because its axis is tilted 23 degrees. How the sunlight hits the Earth determines the seasons. Direct rays = summer Indirect rays = Winter Direct rays = summer Indirect rays = Winter Slide 7 Solstice Winter: The shortest day of the Year (about Dec. 21) (about Dec. 21) Summer: The longest day of the Year (about June 21) (about June 21) Slide 8 Equinox Equal day and night Autumn: Autumnal Equinox - First day of Fall Autumn: Autumnal Equinox - First day of Fall (about Sept. 21) (about Sept. 21) Vernal: Spring Equinox First day of Spring Vernal: Spring Equinox First day of Spring (about March 21) (about March 21)