Astronomy

By: Shannon Allen

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

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

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

Calendars

Calendar - a system for organizing time

Constellations

Constellations – sections of the sky that contain recognizable star pattern

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

Light Year

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

Telescopes

Telescope – an instrument that collects electromagnetic radiationRefracting Telescope – a telescope that uses a set of lenses to gather and focus lightReflecting Telescope – a telescope that uses curved mirrors to gather and focus light

Electromagnetic Spectrum

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

The End