Axis that the Earth An imaginary right line running v the facility of the earth from the north Pole to the southern Pole. The planet is stated to revolve (spin) on this axis, i m sorry is "tilted" in relationship to the sun. This causes our seasons.

You are watching: The imaginary line that goes around the earth from east to west


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Equinox The word way "equal night." It describes the 2 moments every year when the sun appears to cross the equator. The spring (vernal) equinox is around March 21 and the loss (autumnal) equinox is about September 23. Virtually all places on planet have about 12 hours of daylight and also 12 hours of night ~ above the equinoxes. The sun doesn"t really move, yet it looks choose it does to us. That"s because our earth is tilted as it revolves around the sun when a year.
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feather or fall equinox

Greenwich mean Time (GMT) or universal Time (UT) An global time-keeping standard based on the neighborhood time in Greenwich, England (0 degrees longitude). GMT or UT enables us to describe things that take place at the same moment in various time zones. (It would certainly be confuse to usage "local time.") At any type of moment, GMT/UT is the same all over on Earth. (That"s why it"s referred to as universal time.) What time is the now? examine the Greenwich mean Time clock.


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This map mirrors how countless hours you need to add to or subtract from your regional time to gain the GMT. (Click to enlarge.)
Hemisphere A mapping division definition half of the earth (sphere). First, photo cutting the earth in fifty percent at the equator (0 degrees latitude). This divides the planet into the north Hemisphere (north of the equator) and also the southerly Hemisphere (south of the equator). These space labeled in yellow top top the illustration. Next photo cutting the earth in fifty percent at the prime Meridian (0 degrees longitude). This divides the planet into the western Hemisphere (west of the element Meridian) and also the east Hemisphere (east that the element Meridian). These room labeled in red top top the illustration.
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Click come enlarge this photo of the earth"s hemispheres.
Latitude imagine horizontal mapping present on the Earth. Castle are recognized as "parallels" that latitude because they run parallel to the Equator. The variety of degrees of latitude mirrors how much north or southern of the Equator a details location is.
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Longitude Imaginary upright mapping currently on planet known together "meridians" of longitude. The number of degrees that longitude shows exactly how far eastern or west the the prime Meridian a certain location is.


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Meridian An imagine line the runs vertically, north and also south, from the north Pole come the southern Pole. Every points ~ above a meridian have the exact same longitude.
Prime Meridian: The prime Meridian serves together the beginning point because that longitude measurement, for this reason is suggested as 0 levels longitude. The prime Meridian passes directly over the British imperial Observatory in Greenwich, England. (See illustration, above.)
Revolution that the Earth The yearly 365 1/4 days pilgrimage the planet takes roughly the sun. Us experience various seasons together the tilted planet revolves roughly the sun.
Rotation that the Earth The turn or turning of the planet on that axis. The planet makes one finish rotation every twenty-four hours.

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Solstice The word method "sun stop." It refers to the two moments yearly when the sun appears to be the furthest from the equator. On the winter solstice in our hemisphere (around December 22), the sun seems to reach its most southerly point. That is ours shortest day of the year. Native there, it appears to head north till it reaches its many northerly point. That is ours summer solstice (around June 21): the longest day of the year. Once the northern Hemisphere has actually its summer solstice, the southerly Hemisphere has its winter solstice, and vice versa.The sun doesn"t really move, yet it looks prefer it does to us. That"s since our earth is tilted as it revolves about the sun once a year.
Twenty-Four Hour Clock Instead of maintaining time on the communication of 12 a.m. Hours and 12 p.m. Hours, the 24-hour clock runs right through. It starts at 00:00 (midnight) and runs to 23:59 (11:59 PM). This is also known together "military time."