Sidereal time and Sundial

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Difference between Sidereal time and Sundial

Sidereal time vs. Sundial

Sidereal time is a timekeeping system that astronomers use to locate celestial objects. A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky.

Celestial coordinate system

In astronomy, a celestial coordinate system is a system for specifying positions of celestial objects: satellites, planets, stars, galaxies, and so on.

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Celestial equator

The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.

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Celestial pole

The north and south celestial poles are the two imaginary points in the sky where the Earth's axis of rotation, indefinitely extended, intersects the celestial sphere.

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Declination

In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.

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Diurnal motion

Diurnal motion (lit, from dies, lit. "day") is an astronomical term referring to the apparent daily motion of stars around Earth, or more precisely around the two celestial poles.

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Earth's rotation

Earth's rotation is the rotation of Planet Earth around its own axis.

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Fixed stars

The fixed stars (stellae fixae) comprise the background of astronomical objects that appear to not move relative to each other in the night sky compared to the foreground of Solar System objects that do.

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Meridian (astronomy)

In astronomy, the meridian is the great circle passing through the celestial poles, the zenith, and the nadir of an observer's location.

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Nocturnal (instrument)

A nocturnal is an instrument used to determine the local time based on the relative positions of two or more stars in the night sky.

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Orthogonality

In mathematics, orthogonality is the generalization of the notion of perpendicularity to the linear algebra of bilinear forms.

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Solar time

Solar time is a calculation of the passage of time based on the position of the Sun in the sky.

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Sun

The Sun is the star at the center of the Solar System.

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Tropical year

A tropical year (also known as a solar year) is the time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice.

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Universal Time

Universal Time (UT) is a time standard based on Earth's rotation.

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