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65 Cards in this Set

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