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Analemma — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Analemma
License (as archived): CC-BY-SA-4.0
Archived: 2026-11-09T00:48:40.424Z
SHA-256 of the archived text: 54944ae1a979123206193947ec398466215c5902deed902125e303f80bbb11e0
Stable URL of this page: https://metraipolis.com/documento/dc_85eee07aa334

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Analemma — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Analemma (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_85eee07aa334 (Metraipolis archive dc_85eee07aa334, sha256 54944ae1a979123206193947ec398466215c5902deed902125e303f80bbb11e0)

BibTeX

@misc{dc85eee07aa334,
  title = {Analemma — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Analemma},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_85eee07aa334; sha256 54944ae1a979123206193947ec398466215c5902deed902125e303f80bbb11e0},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Analemma. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In astronomy, an analemma (; from Ancient Greek ἀνάλημμα (analēmma) 'support') is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same mean solar time over the course of a year. The change of position is a result of the shifting of the angle in the sky of the path that the Sun takes in respect to the stars (the ecliptic). The diagram resembles a figure eight. Globes of the Earth often display an analemma as a two-dimensional figure of equation of time ("sun fast") vs. declination of the Sun. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation as it orbits around the Sun. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by the combined effects of Earth's axial tilt and its orbital eccentricity. An analemma can be photographed by keeping a camera at a fixed location and orientation and taking multiple exposures throughout the year, always at the same time of day (disregarding daylight saving time and in as little cloud cover as possible). Although the term analemma usually refers to Earth's solar analemma, it can be applied to other celestial bodies as well.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (deposito sistematico; retro-catalogo: tutte le voci di Wikipedia in inglese, in ordine alfabetico).
Fonte: Wikipedia in inglese, voce «Analemma» — https://en.wikipedia.org/wiki/Analemma
Wikidata Q484737: «differenza della posizione esatta del Sole alla stessa ora nei giorni differenti nella stessa località» (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q484737
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Analemma?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1369669632, consultata il 2026-11-09T00:45:44.370Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 46aae8908ee74b332cc3b37647d48f5419087a57aec6935a70dc493742b0d32a