Difference between revisions of "Precession of the equinoxes"

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(Added list of North Stars)
(Added South Stars; more North Stars)
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|[[Alderamin]]
 
|[[Alderamin]]
 
|Alpha [[Cepheus|Cephei]]
 
|Alpha [[Cepheus|Cephei]]
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|-
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|10,000 AD<ref name="uk">http://myweb.tiscali.co.uk/moonkmft/Articles/Precession.html</ref>
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|[[Deneb]]
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|Alpha [[Swan|Cygnis]]
 
|-
 
|-
 
|14000 AD
 
|14000 AD
 
|[[Vega]]
 
|[[Vega]]
 
|Alpha [[Lyra]]e
 
|Alpha [[Lyra]]e
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|}
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==List of selected South Stars<ref name="uk" />==
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{| class="wikitable"
 +
|-
 +
!Approximate year
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!Common name
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!Astronomical name
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|-
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|4000 BC
 +
|Achernar
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|Alpha [[Eridanus|Eridani]]
 +
|-
 +
|2000 AD
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|n/a
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|Sigma [[Octent|Octans]]
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|-
 +
|4200 AD
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|n/a
 +
|Gamma [[Chameleon]]
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|-
 +
|5800 AD
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|n/a
 +
|Omega [[Keel|Carinae]]
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|-
 +
|8100 AD
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|Aspidiske
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|Iota [[Keel|Carinae]]
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|-
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|9200 AD
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|n/a
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|Delta [[Sails|Velae]]
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|-
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|14000 AD
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|Canopus
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|Alpha [[Keel|Carinae]]
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|-
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|22000 AD
 +
|Achernar
 +
|Alpha [[Eridanus|Eridani]]
 
|}
 
|}
  

Revision as of 21:51, December 1, 2009

The precession of the equinoxes describes an astronomical phenomenon whereby the earth appears to wobble on its axis relative to the stars. This wobble is very slow, taking about 26,000 years to complete.[1] The result of this is that the position of stars and constellations overhead at any particular time gradually changes over the years. For example, the constellation that rises above the horizon at the spring equinox gradually cycles through the signs of the zodiac backwards. The star around which all the other stars seem to revolve (to an observer on Earth) also changes over time, meaning that Polaris, or the present North Star, has not always been the star closest to north, and will be replaced by other stars in the future. The Earth's axis pointed to the star Thuban in the year 3000 B.C., and it will point to the bright star Vega in the year A.D. 14,000. [2]


List of selected North Stars[3]

Approximate year Common name Astronomical name
3000 BC Thuban Alpha Draconis
1000 BC Kochab Beta Ursa Minoris
2000 AD Polaris Alpha Ursa Minoris
4000 AD Alrai Gamma Cephei
7500 AD Alderamin Alpha Cephei
10,000 AD[4] Deneb Alpha Cygnis
14000 AD Vega Alpha Lyrae

List of selected South Stars[4]

Approximate year Common name Astronomical name
4000 BC Achernar Alpha Eridani
2000 AD n/a Sigma Octans
4200 AD n/a Gamma Chameleon
5800 AD n/a Omega Carinae
8100 AD Aspidiske Iota Carinae
9200 AD n/a Delta Velae
14000 AD Canopus Alpha Carinae
22000 AD Achernar Alpha Eridani

References

  1. ↑ "Turn, turn, turn: in addition to its daily spin and its annual trip around the Sun, the Earth wobbles—affecting the seasons, the "north star," and human history," Natural History, 2006
  2. ↑ "What is the north star?" Essortment.com
  3. ↑ http://www.glyphweb.com/esky/concepts/northerncelestialpole.html
  4. ↑ 4.0 4.1 http://myweb.tiscali.co.uk/moonkmft/Articles/Precession.html
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