astronomy by: shannon allen. vocabulary calendar - a system for organizing time year – the time...
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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
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
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