Meridian Line


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Meridian Line

 

the straight line along which the celestial meridian plane intersects the plane of the celestial horizon. The meridian line intersects the celestial sphere at the north and south points. The line in the horizontal plane perpendicular to the meridian line determines the east and west points on the celestial sphere. The sun reaches its greatest height above the horizon almost exactly at apparent noon, at. which point the center of its disk intersects the meridian, although the greatest height may be reached somewhat earlier or later than noon owing to variations in the declination of the sun. At this time, shadows cast by objects on the earth point along the meridian line and are at their shortest. This makes it possible to determine approximately the moment at which noon begins and the cardinal points—north, south, east, and west.

References in periodicals archive ?
Seasonal variation of the sun inclination and hence the longitudinal position on the meridian line sets the time over a year, in particular the extremities of the line, summer and winter solstices, and the equinoxes, spring and autumn.
The use of the equator to measure angle of longitude means that all points along the longitude or meridian line will have the same degrees of longitude.
Similarly, the difference between the east and the west product sums is divided by the total county population to give the measure of arc the population center is east or west of the meridian line.
With more than 20 years' experience in the travel industry, Meridian Line Travel has launched a unique new website featuring charter flight availability departing from 25 airports in the UK, including Newcastle.
Their credit unions had been linked for more than a year by Christian Aid as part of the On The Line project, brainchild of broadcaster Jon Snow to unite countries along the Greenwich Meridian Line - from the UK to West Africa.
Holding a metal bar in one hand to conduct the current, Harry placed the other probe to my middle finger meridian line and began testing all the foods and chemicals.
The clock features a countdown panel like the one that appears above the Prime Meridian line at the Royal Observatory in Greenwich.
Together we will be raising people's awareness of those countries that are on the meridian line and highlighting the different environmental and development projects that we are working on in them.
And in the same spot, straddle the meridian line that divides the world - placing one foot in the east, the other in the west.
The site is intersected by the Nussbaum Pathway, with its Missing Pictures Gallery, linking the villa with the new gallery, crossing a Garden of the Future and continuing beyond the site boundary to cross a meridian line to Auschwitz.
She said: "We went to the museum in Greenwich and could see where telescopes originated from and could stand on the Meridian line, that was fun.
DESPITE Johnny Portman's reservations about the very fast ground, Meridian Line was always going well in the juvenile fillies' maiden before scoring unchallenged.