1	Space Cycles Review
2	Cycle # 1 Day à Night à Day à Night
3	We have day and night because the Earth ROTATES On it’s axis Once every 24 ¼ hours ½ of the Earth is illuminated (lit up) at a time
4	Cycle #2 The length of days Long à Longerà Longest à Longer à Longà Short à Shorter à Shortest à Short à Shorter à Shortest à Long à Longer à Longest
5	The length of day changes during the year The number of hours of daylight is different at different times of the year The number of hours of daylight is different at different latitudes
6
7	Summary Days are longer (more hours of daylight) in summer, shorter in winter There are greater differences in day length further away from the Equator There is not much change in day length near the Equator
8	Summary Days get LONGER (more minutes of daylight each day) from the Winter Solstice to the Summer Solstice Days get SHORTER (fewer minutes of daylight each day) from the Summer Solstice to the Winter Solstice Day length is about EQUAL everywhere in the world on the Autumnal & Vernal Equinox
9	Why does the length of day change? Because the Earth moves, or REVOLVES around the Sun This changes the way sunlight hits the Earth
10	Cycle # 3 The Seasons Winter à Spring à Summer à Fall à Winter à Spring à Summer
11	Seasons are caused by The tilt of the Earth The position of Earth in space The difference in direct and indirect light from the Sun
12
13	Summary In winter: Part of the Earth is tilted AWAY from the Sun Part of the Earth gets INDIRECT energy from the Sun In summer Part of the Earth is tilted TOWARD the Sun Part of the Earth gets DIRECT energy from the Sun
14	Cycle # 4 Moon Phases New moon à Waxing Crescent à 1^st Quarter à Waxing Gibbous à Full Moon à Waning Gibbous à 3^rd Quarter à Waning Crescent à New Moon
15	The Moon A moon phase cycle (LUNAR CYCLE) lasts 29 1/2 days Moon phases are caused by the positions of the Moon, Sun, and Earth The moon also sees Earth phases
16
17
18
19
20
21
22
23
24
25
26
27
28	Summary