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eon

In astronomical terms, a unit of time equivalent to 1 billion years.

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ส่วนหนึ่งของคำพูด: noun
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อุตสาหกรรม/ขอบเขต: Astronomy
Category: General astronomy
Company: Caltech
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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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