Talk:Callippus

	Biography portal This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography articles
	This article is supported by the science and academia work group.

Greece Mid‑importance

	Greece portal This article is within the scope of WikiProject Greece, a collaborative effort to improve the coverage of Greece on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.GreeceWikipedia:WikiProject GreeceTemplate:WikiProject GreeceGreek articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Classical Greece and Rome Mid‑importance

	This article is within the scope of WikiProject Classical Greece and Rome, a group of contributors interested in Wikipedia's articles on classics. If you would like to join the WikiProject or learn how to contribute, please see our project page. If you need assistance from a classicist, please see our talk page.Classical Greece and RomeWikipedia:WikiProject Classical Greece and RomeTemplate:WikiProject Classical Greece and RomeClassical Greece and Rome articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Astronomy Mid‑importance

	Astronomy portal This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy articles
Mid	This article has been rated as Mid-importance on the project's importance scale.

Philosophy: Philosophers / Ancient Low‑importance

This article is within the scope of WikiProject Philosophy, a collaborative effort to improve the coverage of content related to philosophy on Wikipedia. If you would like to support the project, please visit the project page, where you can get more details on how you can help, and where you can join the general discussion about philosophy content on Wikipedia.PhilosophyWikipedia:WikiProject PhilosophyTemplate:WikiProject PhilosophyPhilosophy articles

Low

This article has been rated as Low-importance on the project's importance scale.

Associated task forces:
/
	Philosophers
	Ancient philosophy

Precision?

What exactly is meant by "started his observation cycle on the summer solstice, 330 BC"? Did he start observing that day, which eventually led him to derive the duration of his cycle (he would have been 40 then, and... 120???... when he finished his observations), or did he start applying his cycle in 330 BCE, for his own personal calendar—or for a state calendar, although we see here no trace of him talking to religious or government authorities to get his cycle accepted by them... Please clarify... CielProfond (talk) 12:57, 8 April 2018 (UTC)[reply]