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65 Cards in this Set
- Front
- Back
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the study of the universe by ancient people
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ARCHAEOASTRONOMY
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the study of astronomical practices, calendar developments, and myths of a culture
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ETHNOASTRONOMY
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natural cycle followed by most organisms
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SUN'S DAILY CYCLE
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modern clocks rely on the steady rhythms of...
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PULSARS
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7 celestial bodies visible to the naked eye
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SUN, MOON, MERCURY, VENUS, MARS, JUPITER, SATURN
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namesake of Monday
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MOON
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namesake of Sunday
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SUN
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namesake of Tuesday
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MARS (gods: Aries, Mars, Tiu)
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namesake of Wednesday
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MERCURY (gods: Mercury, Wodin/Odin, Hermes)
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namesake of Saturday
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SATURN (gods: Saturn, Cronus)
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namesake of Thursday
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JUPITER (gods: Thor, Jupiter/Jove, Zeus)
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namesake of Friday
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VENUS (gods: Aphrodite, Venus, Freya/Frigga)
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basis of a month
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MOON'S CYCLE ("moonth")
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direction Sun moves against background stars
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EASTWARD
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basis of a year
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EARTH'S REVOLUTION AROUND THE SUN (360 degrees)
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name of the current calendar
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JULIAN CALENDAR
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how we adjust for Earth's revolution lasting 365.25 days
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LEAP YEAR EVERY 4 YEARS
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examples of a lunar calendar
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ISLAM, JUDEOCHRISTIAN
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causes of seasons
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EARTH'S TILT ON ITS AXIS AND REVOLUTION AROUND THE SUN
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causes day/night
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EARTH'S ROTATION
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number of timezones
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24 (BASED ON 1 degree/hr)
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northermost position of Sun on the horizion
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SUMMER SOLSTICE
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southernmost position of Sun on the horizon
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WINTER SOLSTICE
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smallest shadow produced
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SUMMER SOLSTICE
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longest shadow produced
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WINTER SOLSTICE
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longest day of the year
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SUMMER SOLSTICE
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shortest day of the year
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WINTER SOLSTICE
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approximately June 20
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SUMMER SOLSTICE
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approximately December 20
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WINTER SOLSTICE
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also called the vernal equinox
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SPRING EQUINOX
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also called autumnal equinox
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FALL EQUINOX
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occurs when the Sun is at the intersection of the ecliptic and equator
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EQUINOXES
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days of approximately equal lengths of daylight and darkness
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EQUINOXES
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approximately March 21
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SPRING EQUINOX
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approximately Septemeber 21
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FALL EQUINOX
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approximate width of a timezone
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15 DEGREES LONGITUDE
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wobble of Earth's axis
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PRECESSION
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stars appearing to revolve around the poles
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CIRCUMPOLAR
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the star about which circumpolar stars appear to revolve
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NORTH STAR
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current north star
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POLARIS
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future north star
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VEGA
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length of one complete precessional wobble
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26,000 YEARS
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length of rotation
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ABOUT 24 HOURS
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for example: N, E, S, W
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CARDINAL DIRECTIONS
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degrees clockwise from north
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AZIMUTH
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azimuth of east
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90
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azimuth of south
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180
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azimuth of west
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270
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azimuth of north
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0
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intercardinal directions
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NE, SE, SW, NW
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lines drawn north and south
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LONGITUDE
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lines marked east or west
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LONGITUDE
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0 LONGITUDE
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PRIME MERIDIAN
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lines drawn east and west
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LATITUDE
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lines marked north or south
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LATITUDE
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0 LATITUDE
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EQUATOR
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observer's overhead point
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ZENITH
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latitude in the sky
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DECLINATION
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celestial equator
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ECLIPTIC
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longitude in the sky
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RIGHT ASCENSION
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path of the Sun amongst the stars
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ECLIPTIC
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the moment when two bodies have the same ecliptic
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CONJUNCTION
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12 constellations along the ecliptic
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ZODIAC
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a group of stars that appear to form a picture
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ASTERISM
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a grouping of stars found in a mapped grid in the celestial sphere
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CONSTELLATION
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