## Although specific at the time of publication, it is no much longer being updated. The page may contain broken web links or outdated indevelopment, and also components might not feature in present internet browsers.You are watching: What is the largest possible latitude that one can reach

Site MapLesboy planGlossary TimelineQuestions & AnswersCentral Home Page (5) Latitude and also Longitude Index4. The Moon (1) 4a. The Moon (2)4b. Moon Libration5.Latitude and also Longitude5a. Navigation 5b. Cross-Staff 5c. Coordinates6. The Calendar6a. Jewish Calendar7.Precession8. The Round Earth8a. The Horizon Any place on Planet can be figured out by 2 numbers--its latitude and its longitude. If a pilot or a ship's captain desires to specify a place on a map, these are the "coordinates" they would certainly use.

Actually, these are two angles, measured in levels, "minutes of arc" and also "secs of arc." These are deprovided by the signs (°, ', " ) e.g. 35° 43' 9" indicates an angle of 35 degrees, 43 minutes and also 9 secs (carry out not confuse this via the notation (', ") for feet and also inches!). A degree has 60 minutes of arc and a minute has 60 seconds of arc--and also you may omit the words "of arc" wbelow the context renders it absolutely clear that these are not systems of time. Calculations regularly reexisting angles by small letters of the Greek alphabet, and also that method latitude will certainly be stood for by λ (lambda, Greek L), and longitude by φ (phi, Greek F).Here is exactly how they are characterized.PLEASE NOTE: Charts used in sea navigating regularly use the OPPOSITE notation--λ for LONGITUDE and also φ for LATITUDE. The convention adhered to below resembles the one used by mathematicians in 3 dimensions for spherical polar collaborates. Latitude

The latitude angle lambda Imagine the Planet was a transparent spbelow (actually the shape is slightly oval; bereason of the Earth's rotation, its equator bulges out a little). Thturbulent the transparent Earth (drawing) we have the right to view its equatorial plane, and also its middle the point is O, the facility of the Earth. To specify the latitude of some suggest P on the surface, attract the radius OP to that point. Then the elevation angle of that suggest above the equator is its latitude λ--northern latitude if north of the equator, southern (or negative) latitude if south of it.
Lines of latitude If on a globe of the Earth we connect all points via the exact same latitude, we gain circles of various dimension. These are "lines of latitude" (drawing). The longest is the equator, whose latitude is zero, while at the poles, at latitudes 90° north and 90° southern (or –90°), the circles shrink to a suggest.

## Longitude

On the globe, lines of consistent longitude ("meridians") extend from pole to pole, favor the segment limits on a peeled oarray. Every meridian have to cross the equator. Due to the fact that the equator is a circle, we deserve to divide it--favor any circle--into 360 levels, and also the longitude φ of a suggest is then the marked worth of that division wbelow its meridian meets the equator. What that value is counts of course on where we start to count--on wright here zero longitude is chosen to be. For historic reasons, the meridian passing the old Royal Astronomical Observatory in Greenwich, England, is the one liked as zero longitude. Located at the eastern edge of London, the British resources, the observatory is now a public museum and a brass band also stretching throughout its yard marks the "prime meridian." Tourists often get photographed as they straddle it--one foot in the eastern hemisphere of the Planet, the other in the western hemisphere.
Lines of longitude or "meridians" A line of longitude is also referred to as a meridian, obtained from the Latin, from meri, a variation of "medius" which denotes "middle", and also diem, meaning "day." The word once meant "noon", and also times of the day before noon were well-known as "ante meridian", while times after it were "write-up meridian." Today's abbreviations a.m. and also p.m. come from these terms, and also the Sun at noon is occasionally said to be "passing meridian". All points on the same line of longitude knowledgeable noon (and also any type of various other hour) at the very same time and were therefore said to be on the same "meridian line", which came to be "meridian" for brief (however, read likewise below about time zones).

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