1. Astronomy By: Shannon Allen

2. Vocabulary Calendar - a system for organizing time Year – the time required for the earth to orbit the sun once Month – roughly the amount of time required for the moon to orbit the earth once Day- the time required for the earth to rotate on its axis Leap Year – a year in which an extra day is added to the calendar

3. Vocabulary Leap Year – a year in which an extra day is added to the calendar Constellations – sections of the sky that contain recognizable star pattern Altitude – the angle between the object and the horizon Right Ascension – a measure of how far east an object is from the point at which the sun appears on the first day of spring Declination – a measure of how far north or south an object is from the celestial equator Celestial Equator – an imaginary circle created by extending earth’s equator into space

4. Vocabulary Light-Year – a unit of length equal to the distance that light travels through space in 1 year Telescope – an instrument that collects electromagnetic radiation Refracting Telescope – a telescope that uses a set of lenses to gather and focus light Reflecting Telescope – a telescope that uses curved mirrors to gather and focus light Electromagnetic Spectrum – made of all of the wavelength of electromagnetic radiation

5. Calendars Calendar - a system for organizing time

6. Constellations Constellations – sections of the sky that contain recognizable star pattern

7. Celestial Equator Celestial Equator – an imaginary circle created by extending earth’s equator into space

8. Light Year Light-Year – a unit of length equal to the distance that light travels through space in 1 year

9. Telescopes Telescope – an instrument that collects electromagnetic radiation Refracting Telescope – a telescope that uses a set of lenses to gather and focus light Reflecting Telescope – a telescope that uses curved mirrors to gather and focus light

10. Electromagnetic Spectrum Electromagnetic Spectrum – made of all of the wavelength of electromagnetic radiation

11. The EndThe End