Talk:Gan De

	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.

China: History Mid‑importance

	China portal This article is within the scope of WikiProject China, a collaborative effort to improve the coverage of China related articles 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.ChinaWikipedia:WikiProject ChinaTemplate:WikiProject ChinaChina-related articles
Mid	This article has been rated as Mid-importance on the project's importance scale.
	This article is supported by WikiProject Chinese history (assessed as Mid-importance).

Astrology

	This article is within the scope of WikiProject Astrology, a collaborative effort to improve the coverage of Astrology 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.AstrologyWikipedia:WikiProject AstrologyTemplate:WikiProject Astrologyastrology articles
???	This article has not yet received a rating on the project's importance scale.

Astronomy Start‑class Low‑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
Start	This article has been given a rating which conflicts with the project-independent quality rating in the banner shell. Please resolve this conflict if possible.
Low	This article has been rated as Low-importance on the project's importance scale.

Galilean moons?[edit]

It's theoretically possible to see them without optical aid, but in practice Jupiter's glare makes it very difficult or impossible. Some people have reportedly seen Ganymede and Callisto by hiding Jupiter behind wires, trees etc.

However there seems to be another possible identification of the mysterious star- Uranus. In 366BC it underwent a series of close conjunctions with Jupiter, one in February (when Mars was involved as well, the three were less than a degree apart), another in late April/early May (about 40-45'), again in September (very close, 15' or so). Uranus is just within naked eye visibility, and when close to Jupiter but further than any moon ever gets would have appeared like a very faint "star". These conjunctions all took place in a fairly barren area of sky on the Ophiuchus/Sagittarius border. Walshie79 (talk) 15:36, 20 June 2015 (UTC)[reply]

External links modified[edit]

Hello fellow Wikipedians,

I have just modified one external link on Gan De. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

Added archive https://web.archive.org/web/20070715145637/http://aa.usno.navy.mil/publications/docs/NewES.htm to http://aa.usno.navy.mil/publications/docs/NewES.htm

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 02:13, 2 January 2018 (UTC)[reply]

Anachronism[edit]

The section about the books has an anachronism. It mentions a book that "records the motion of Jupiter, Saturn, Venus and other planets in their orbits between 246 BC and 177 BC" and attributes it to Gan De, but the opening paragraph of the article says the astronomer lived in the 4th century BCE, and his Jupiter observation is dated 365 BC, which means he would have been long dead by 246 BCE, let alone 177 BCE! CielProfond (talk) 17:09, 7 April 2018 (UTC)[reply]

It is possible that the Mawangdui Silk Texts refer to Gan De and Shi Shen and that they also mention observations made by another. — Preceding unsigned comment added by 86.178.1.178 (talk) 11:52, 23 April 2018 (UTC)[reply]

Observations made over 69 years might have been made by dozens of different observers.