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Gebruik ‘n aardbol of ‘n kaart in jou atlas en maak seker dat jy verstaan wat elkeen van hierdie feite beteken.

  • Die Greenwich-meridiaan (0°-lengtelyn) vorm ‘n halfsirkel op die aardbol. As dit agterom die aardbol verleng word, vorm dit nog ‘n halfsirkel. Hierdie agterste halfsirkel word die antipode van die 0°-lengtelyn genoem en word 180° genommer. ‘n Lengtelyn en sy antipode vorm altyd ‘n volle sirkel. Vanaf die 0° lengtelyn kan daar dus 180° Wes en 180° Oos beweeg word.

So het elke lengtelyn ‘n antipode en as die twee lyne se graadnommers bymekaar getel word, gee dit altyd 180° as antwoord. ( bv. 0° O + 180° W = 180°)

Die Greenwich-meridiaan word as verwysing gebruik wanneer ‘n plek se tyd bepaal word.

Daar ontstaan egter nou ‘n probleem: As ons van die 0°-lengtelyn ooswaarts beweeg en van die 0°-lengtelyn weswaarts beweeg, bereik ons van albei kante die 180° lengtelyn. Nou gaan ons tye darem baie verskil!

  • Om die probleem op te los is die Internasionale Datumlyn (IDL) ontwikkel.

Dit volg die 180°-lengtelyn, maar sny nêrens oor land nie.

Die datum oos van die IDL is een dag vroeër; wes van die IDL is een dag later.

Van oos na wes verloor ‘n mens ‘n dag as jy oor die IDL beweeg.

Van wes na oos wen ‘n mens ‘n dag as jy oor die IDL beweeg.

Byvoorbeeld:

180° W 180° O
weswaarts ooswaarts
Beginpunt
verloor - + wen
Sondag Maandag Maandag
00 : 00 12 : 00 24 : 00
  • ‘n Plek se lengteligging is ook ‘n aanduiding van tyd :

Die aarde draai van wes na oos om sy eie denkbeeldige as. Die son kom dus vroeër op by plekke verder na die ooste.

Die son kom in Durban (31° O) ongeveer 50 minute vroeër as in Kaapstad (18½° O) op. In Suid-Afrika is so ‘n verskil nie ‘n probleem nie, want ons gebruik net een tydsone (30° O). In ‘n land soos die VSA is dit wel ‘n probleem. Die son kom in New York (74° W) ongeveer drie uur vroeër op as in San Francisco (122½° W). In die VSA is dit dus nodig dat daar verskillende tydsones moet wees.

  • Julle het seker al opgemerk dat as rugbywedstryde in Australië of Nieu-Seeland gespeel word en ons volg dit hier op TV, dit hier nog in die oggend is. Dit is so omdat daardie lande baie ver oos van Suid-Afrika lê en die son dus daar “vroeër” opkom.
  • Om die verskil in tyd te bereken, is nie so moeilik nie. Dit het alles te doen met die draaiing van die aarde om sy eie as.
  • Hoe lank neem dit vir die aarde om om sy eie as te draai?Dit duur 24 uur.
  • Deur hoeveel grade draai die aarde in hierdie 24 uur? Die aarde draai deur 360 ° .
  • Deel ons nou die 360° deur die 24 uur, blyk dit dat die aarde elke uur deur ‘n hoek van 15° draai. As twee plekke 15 lengtegrade uitmekaar lê, sal die son presies een uur vroeër by die plek opkom wat die verste oos lê.

Assessering

Leeruitkomstes(LUs)
LU 1
AARDRYKSKUNDIGE ONDERSOEKDie leerder is in staat om ondersoekvaardighede te gebruik om aardrykskundige en omgewingsbegrippe en -prosesse te ondersoek.
Assesseringstandaarde(ASe)
Dit is duidelik wanneer die leerder:
1.1 inligtingsbronne , insluitend eenvoudige statistiek, identifiseer om die vraag oor ‘n maatskaplike of omgewingsvraaagstuk of –probleem te help beantwoord;
  • relevante inligting vir spesifieke doeleindes uit bronne kies en dit opteken;
  • breedte- en lengteligging gebruik om relevante plekke op kaarte te vind;
  • inligting gebruik om oplossings vir probleme voor te stel;
1.5 verslag doen oor ondersoeke deur bespreking, debat, gestruktureerde skryfwerk, grafieke, tabelle, kaarte en diagramme.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Aardrykskunde graad 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col10999/1.1
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