julijanski datum

julijanski datum

The interval of time in days (and fraction of a day) since Greenwich noon on Jan. 1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition of JD was introduced when the astronomical day was defined to start at noon (prior to 1925) instead of midnight. Thus, 1995 Oct. 10. 0 UT = JD 2450000. 5.

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Industrija/področje: Astronomy
Category: General astronomy
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datum

Telecommunications; GPS (global positioning system)

A math model which depicts a part of the surface of the earth. Latitude and longitude lines on a paper map are referenced to a specific map datum. The map datum selected on a GPS ...

zenit

Astronomy; General astronomy

The point directly overhead in the sky.

рефрактор

Astronomy; General astronomy

A telescope that uses as its primary optical element a lens. Binoculars are a type of refractor. In general, refractors are much more expensive to build and buy than are ...

рефлектор

Astronomy; General astronomy

A telescope that uses as its primary optical element a mirror. Nearly all large telescopes in use today by amateur and professional astronomers are reflecting telescopes.

фотометрија

Astronomy; General astronomy

In astronomy, the measurement of the light emitting from astronomical objects, generally in the visible or infrared bands, in which a specific or general wavelength band is ...

паралакса

Astronomy; General astronomy

The apparent displacement or the difference in apparent direction of an object as seen from two different points not on a straight line with the object (as from two different ...

орбита

Astronomy; General astronomy

The path of one object about another (used here for an object orbiting the sun).

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Industrija/področje: Animals Category: Birds

црвени северни фликер

The Red-shafted Northern Flicker (Colaptes auratus) is a medium-sized member of the woodpecker family. Native to western North America, it's one of ...