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25 Cards in this Set

  • Front
  • Back

Earth's rotation is the rotation of the planet Earth around its own axis.

Revolution is the movement of one object around a center or another object

Year is the time taken by a planet to make one revolution around the sun.

Orbit is the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

Eclipse is the total or partial obscuring of one celestial body by another

Perihelion is the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.

Aphelion is the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.

Constellation is a group of stars forming a recognizable pattern.

International Astronomical Union is a collection of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.

Time is a point of time as measured in hours and minutes past midnight or noon.

Axis is an imaginary line about which a body rotates.

Calendar is a chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information.

Lunar Year is a period of twelve lunar months (approximately 354 days).

Leap Year is a year, occurring once every four years, that has 366 days including February 29 as an intercalary day.

Noon is twelve o'clock in the day; midday.

Time zone


is a region throughout which the same standard time is used

International Date Line is defined as an imaginary line that goes north and south through the Pacific Ocean

Daylight Savings Time is the `time as adjusted to achieve longer evening daylight, especially in summer, by setting the clocks an hour ahead of the standard time.

Equatorial Country is any countries in the equator.

Season each of the four divisions of the year (spring, summer, autumn, and winter)

Autumnal Equinox is the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.

Vernal Equinox is the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere.

Celestial Equator is the projection into space of the earth's equator; an imaginary circle equidistant from the celestial poles.

Solstice is either of the two times in the year, the summer solstice and the winter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.

Hemisphere is a half of a sphere.