1. Chapter 1.1 Notes

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

3. 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

4. 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)