From 0b8ca6637be94f7814cafa7d01ad4699672ff336 Mon Sep 17 00:00:00 2001 From: Darrell Anderson Date: Tue, 21 Jan 2014 22:06:48 -0600 Subject: Beautify docbook files --- .../docs/tdeedu/kstars/geocoords.docbook | 69 +++------------------- 1 file changed, 9 insertions(+), 60 deletions(-) (limited to 'tde-i18n-en_GB/docs/tdeedu/kstars/geocoords.docbook') diff --git a/tde-i18n-en_GB/docs/tdeedu/kstars/geocoords.docbook b/tde-i18n-en_GB/docs/tdeedu/kstars/geocoords.docbook index 5f8d87bf8a7..96330b24325 100644 --- a/tde-i18n-en_GB/docs/tdeedu/kstars/geocoords.docbook +++ b/tde-i18n-en_GB/docs/tdeedu/kstars/geocoords.docbook @@ -1,66 +1,15 @@ -Jason Harris +Jason Harris -Geographic Coordinates -Geographic Coordinate System -LongitudeGeographic Coordinate System -LatitudeGeographic Coordinate System -Locations on Earth can be specified using a spherical coordinate system. The geographic (earth-mapping) coordinate system is aligned with the spin axis of the Earth. It defines two angles measured from the centre of the Earth. One angle, called the Latitude, measures the angle between any point and the Equator. The other angle, called the Longitude, measures the angle along the Equator from an arbitrary point on the Earth (Greenwich, England is the accepted zero-longitude point in most modern societies). By combining these two angles, any location on Earth can be specified. For example, Baltimore, Maryland (USA) has a latitude of 39.3 degrees North, and a longitude of 76.6 degrees West. So, a vector drawn from the centre of the Earth to a point 39.3 degrees above the Equator and 76.6 degrees west of Greenwich, England will pass through Baltimore. The Equator is obviously an important part of this coordinate system; it represents the zeropoint of the latitude angle, and the halfway point between the poles. The Equator is the Fundamental Plane of the geographic coordinate system. All Spherical Coordinate Systems define such a Fundamental Plane. Lines of constant Latitude are called Parallels. They trace circles on the surface of the Earth, but the only parallel that is a Great Circle is the Equator (Latitude=0 degrees). Lines of constant Longitude are called Meridians. The Meridian passing through Greenwich is the Prime Meridian (longitude=0 degrees). Unlike Parallels, all Meridians are great circles, and Meridians are not parallel: they intersect at the north and south poles. +Geographic Coordinates +Geographic Coordinate System +LongitudeGeographic Coordinate System +LatitudeGeographic Coordinate System +Locations on Earth can be specified using a spherical coordinate system. The geographic (earth-mapping) coordinate system is aligned with the spin axis of the Earth. It defines two angles measured from the centre of the Earth. One angle, called the Latitude, measures the angle between any point and the Equator. The other angle, called the Longitude, measures the angle along the Equator from an arbitrary point on the Earth (Greenwich, England is the accepted zero-longitude point in most modern societies). By combining these two angles, any location on Earth can be specified. For example, Baltimore, Maryland (USA) has a latitude of 39.3 degrees North, and a longitude of 76.6 degrees West. So, a vector drawn from the centre of the Earth to a point 39.3 degrees above the Equator and 76.6 degrees west of Greenwich, England will pass through Baltimore. The Equator is obviously an important part of this coordinate system; it represents the zeropoint of the latitude angle, and the halfway point between the poles. The Equator is the Fundamental Plane of the geographic coordinate system. All Spherical Coordinate Systems define such a Fundamental Plane. Lines of constant Latitude are called Parallels. They trace circles on the surface of the Earth, but the only parallel that is a Great Circle is the Equator (Latitude=0 degrees). Lines of constant Longitude are called Meridians. The Meridian passing through Greenwich is the Prime Meridian (longitude=0 degrees). Unlike Parallels, all Meridians are great circles, and Meridians are not parallel: they intersect at the north and south poles. -Exercise: -What is the longitude of the North Pole? Its latitude is 90 degrees North. -This is a trick question. The Longitude is meaningless at the north pole (and the south pole too). It has all longitudes at the same time. +Exercise: +What is the longitude of the North Pole? Its latitude is 90 degrees North. +This is a trick question. The Longitude is meaningless at the north pole (and the south pole too). It has all longitudes at the same time. -- cgit v1.2.1