Celestial dome in the context of Radius

Celestial dome in the context of Radius

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⭐ Core Definition: Celestial dome

In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the observer, half of the sphere would resemble a hemispherical screen over the observing location.

The celestial sphere is a conceptual tool used in spherical astronomy to specify the position of an object in the sky without consideration of its linear distance from the observer. The celestial equator divides the celestial sphere into northern and southern hemispheres.

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Celestial dome in the context of Classical planet

A classical planet is an astronomical object that is visible to the naked eye and moves across the sky and its backdrop of fixed stars (the common stars which seem still in contrast to the planets), appearing as wandering stars. Visible to humans on Earth there are seven classical planets (the seven luminaries). They are from brightest to dimmest: the Sun, the Moon, Venus, Jupiter, Mercury, Mars and Saturn.

Greek astronomers such as Geminus and Ptolemy recorded these classical planets during classical antiquity, introducing the term planet, which means 'wanderer' in Greek (πλάνης planēs and πλανήτης planētēs), expressing the fact that these objects move across the celestial sphere relative to the fixed stars. Therefore, the Greeks were the first to document the astrological connections to the planets' visual detail.

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LINKED FROM (PARENTS)
← Classical planet ← Classical planets ← Classical Planets ← Naked eye planets ← Classical planets in Western alchemy
LINKS TO (CHILDREN)
Astronomy → Navigation → Abstraction → Sphere → Radius → Concentric objects → Earth → Sky → Projective geometry → Geocentric model → Sphere → Projection screen → Spherical astronomy → Celestial coordinate system → Astronomical object → Celestial equator → Northern celestial hemisphere → Southern celestial hemisphere →