Clement Streitmatter asked, updated on October 15th, 2021; Topic:
right ascension

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Polaris is located at **RA** 2h 41m 39s, Dec. +89° 15′ 51″. Because the stars circle about the sky every 24 hours, **right ascension** or **RA** ranges from 0h to 24h.

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Even more, what are the coordinates of the north celestial pole?

If you stand on the Earth's equator, the **celestial** equator passes overhead. Stand on the **North Pole**, latitude 90° **N**, and overhead will be the **north celestial pole**, declination +90°.

Additional, what is the declination of your local Zenith? The **declination** at the **zenith** is equal to the site's latitude; therefore, the **zenith** for an observer at 45°N will be +45°.

Although, how do you find the declination of a star?

The **declination** of the **star** is measured from the celestial equator, and so the transit altitude of our **star** is given by 90-Φ+δ.

What is the most common celestial coordinate system?

equatorial coordinate system

Finding the **north celestial pole** The **north celestial pole** currently is within one degree of the bright star Polaris (**named** from the Latin stella polaris, meaning "**pole** star").

Coordinate systems**Coordinate** systemCenter point (origin)**Coordinates**Longitude

Equatorial | Center of the Earth (geocentric), or Sun (heliocentric) | Right ascension (α) or hour angle (h) |

Ecliptic | Ecliptic longitude (λ) | |

Galactic | Center of the Sun | Galactic longitude (l) |

Polaris

Look at the noun **declination** and you can see the verb **decline**, which **means** "to lessen," "to slope down," and "to **refuse**." **Declination** is the process of doing any of these things. ... In astronomy, it's also the distance between an object and the celestial equator, measured at an angle.

west declination

The Sun **declination angle**, δ, has the range: – 23.5° < δ < + 23.5° during its yearly cycle . The Sun **declination angle** is δ = – 23.5° on the winter solstice. sin δ = 0.39795⋅ cos [ 0.98563⋅ ( N – 173 ) ] ( 1 ) where the argument of the cosine here is in degrees and N denotes the number of days since January 1.

The total range of right ascension is 24 **hrs** = 360 deg / 15 deg/hr. The 15 deg/hr conversion factor arises from the rotation rate of the **Earth**. **Declination** is analogous to latitude and is measured as north or south of the celestial equator.

Multiply it by -23.44, the tilt of the Earth's axis in degrees. The result is the solar **declination** in degrees for that day of the year. From the example, the cosine of 53.2603 is 0.5982; multiply it by -23.44 to get -14.02 degrees.

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