Chapter 1.1 Notes.

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Presentation transcript:

Chapter 1.1 Notes

How Earth Moves Rotation: spinning on axis Revolution: (orbit) to move around another object (Earth around Sun)

Calendars Astronomy is one of the most ancient sciences Many ancient cultures developed systems to track time (calendars) based on celestial movements Month – based on Lunar Cycle (moonth) Year – based on Solar Cycle

Seasons Solstices & Equinoxes Celestial events Holidays Important in agricultural calendar Solstice: sun farthest north or south of equator, twice a year Winter Solstice (Dec 21): shortest day of year Summer Solstice (June 21): longest day of year Equinox: neither hemisphere is tilted away from Sun, twice a year. Day and night are equal! Spring (Vernal) Equinox (March 21) Fall (Autumnal) Equinox (September 22)