Axis of the Earth An imaginary right line running through the center of the Earth from the North Pole to the South Pole. The earth is shelp to revolve (spin) on this axis, which is "tilted" in relation to the sun. This reasons our seasons.

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Equinox Words implies "equal night." It refers to the 2 moments each year once the sun shows up to cross the equator. The spring (vernal) equinox is about March 21 and also the autumn (autumnal) equinox is roughly September 23. Almany all areas on Earth have about 12 hours of daylight and also 12 hours of night on the equinoxes. The sun does not really move, however it looks choose it does to us. That"s bereason our Earth is tilted as it revolves approximately the sun when a year.
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Spring or loss equinox

Greenwich Mean Time (GMT) or Universal Time (UT) An global time-maintaining typical based on the local time in Greenwich, England also (0 degrees longitude). GMT or UT allows us to describe points that happen at the same minute in different time areas. (It would be confutilizing to usage "local time.") At any type of moment, GMT/UT is the very same almost everywhere on Planet. (That"s why it"s dubbed universal time.) What time is it now? Check the Greenwich Typical Time clock.


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This map reflects just how many kind of hours you need to include to or subtract from your neighborhood time to obtain the GMT. (Click to enhuge.)
Hemispright here A mapping division meaning half of the Planet (sphere). First, picture cutting the earth in half at the equator (0 levels latitude). This divides the Earth into the Northern Hemispbelow (north of the equator) and the Southern Hemispright here (south of the equator). These are labeled in yellow on the illustration. Next off image cutting the earth in half at the Prime Meridian (0 degrees longitude). This divides the Earth right into the Western Hemispbelow (west of the Prime Meridian) and also the Eastern Hemispright here (east of the Prime Meridian). These are labeled in red on the illustration.
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Click to enhuge this image of the earth"s hemispheres.
Latitude Imaginary horizontal mapping lines on the Earth. They are recognized as "parallels" of latitude bereason they run parallel to the Equator. The variety of levels of latitude mirrors exactly how far north or south of the Equator a particular area is.
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Longitude Imaginary vertical mapping lines on Planet recognized as "meridians" of longitude. The number of degrees of longitude reflects exactly how far east or west of the Prime Meridian a particular place is.


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Meridian An imaginary line that runs vertically, north and also southern, from the North Pole to the South Pole. All points on a meridian have actually the very same longitude.
Prime Meridian: The Prime Meridian serves as the starting point for longitude measurement, so is suggested as 0 levels longitude. The Prime Meridian passes directly over the British Royal Observatory in Greenwich, England. (See illustration, above.)
Rdevelopment of the Earth The yearly 365 1/4 days expedition the Earth takes around the sun. We suffer different periods as the tilted Planet revolves about the sunlight.
Rotation of the Earth The spinning or turning of the earth on its axis. The Earth renders one complete rotation eextremely twenty-4 hrs.

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Solstice The word implies "sun sheight." It describes the 2 moments every year when the sun appears to be farthest from the equator. On the winter solstice in our hemispright here (around December 22), the sunlight appears to reach its a lot of southerly point. It is our shortest day of the year. From there, it appears to head north till it reaches its most northerly allude. That is our summer solstice (about June 21): the longest day of the year. When the Northern Hemisphere has its summer solstice, the Southern Hemispbelow has its winter solstice, and also vice versa.The sun doesn"t really move, yet it looks choose it does to us. That"s bereason our Planet is tilted as it revolves approximately the sunlight as soon as a year.
Twenty-Four Hour Clock Instead of keeping time on the basis of 12 a.m. hrs and 12 p.m. hrs, the 24-hour clock runs straight through. It starts at 00:00 (midnight) and runs to 23:59 (11:59 PM). This is also recognized as "military time."