Talk:Nautical almanac

	Transport portal This article is within the scope of WikiProject Transport, a collaborative effort to improve the coverage of articles related to Transport 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.TransportWikipedia:WikiProject TransportTemplate:WikiProject TransportTransport articles
???	This article has not yet received a rating on the project's importance scale.
	This article is supported by the Maritime task force (assessed as Mid-importance).

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

Books

This article is within the scope of WikiProject Books. To participate in the project, please visit its page, where you can join the project and discuss matters related to book articles. To use this banner, please refer to the documentation. To improve this article, please refer to the relevant guideline for the type of work.BooksWikipedia:WikiProject BooksTemplate:WikiProject BooksBook articles

Original publication Date[edit]

Wasn't the 1767 issue of the Nautical almanac published in 1766, so as to have been available to mariners during the entire year? --SV Resolution(Talk) 14:24, 31 July 2007 (UTC)[reply]

Aries is not a star, and doesn't have an exact location[edit]

Something seems fishy to me about the explanation of Aries being listed in the almanac. When I look at the sample photograph, I see an hour angle specified to very high accuracy, under the column labeled "Aries". But Aries is a constellation, and the entire constellation spans a rather large range of angles, both in right ascension and declination. I suspect that this column is really designating the First Point of Aries, i.e. the position of the ascending node where the ecliptic intersects the equatorial plane. This would be logical because it would correct for time of year for which right ascension is measured. Can anybody verify this? I strongly suspect that this part of the article needs to be corrected. CosineKitty (talk) 15:35, 17 April 2008 (UTC)[reply]

Yes, I verify this. The column 'Aries' refers to the first point of Aries and is simply the angular difference between the geographical and the celestial coordinate systems.

Upon further reading, the wording makes it sound like Aries is a star, which is wrong. It is a constellation. CosineKitty (talk) 15:36, 17 April 2008 (UTC)[reply]

I agree the current text is in some ways wrong. I also agree, it's not the constellation Aries that is referred to, but the first point of Aries, otherwise known as the equinox, from which the distances of the various stars are measured. There are other problems with the article too, and a few errors: one that I spotted is the reference to extrapolation, which should be interpolation, and much of the text seems to hark back to a stage where the article was about a specific almanac, the UK/US Nautical Almanac. Some of the details given are actually still specific description of that, and would not be generally applicable to almanacs in general. It seems there's now a quite large number of articles about almanacs and ephemerides, and I wonder if the splitting has gone too far? I haven't got time immediately to try and fix this, but will hope to get time to return, it looks like a big job, maybe someone else is interested enough to try ....? Terry0051 (talk) 12:20, 21 February 2009 (UTC)[reply]

GHA and SHA[edit]

It would be great if someone could add explanations to the acronyms in the nautical almanac. That 'Dec' stands for declination (and not decimal) etc. I think that GHA stands for 'Greenwitch Hour Angle', but I have no idea what SHA stands for. 130.237.216.122 (talk) 08:45, 15 July 2009 (UTC)[reply]

External links modified[edit]

Hello fellow Wikipedians,

I have just added archive links to 2 external links on Nautical almanac. Please take a moment to review my edit. If necessary, add {{cbignore}} after the link to keep me from modifying it. Alternatively, you can add {{nobots|deny=InternetArchiveBot}} to keep me off the page altogether. I made the following changes:

When you have finished reviewing my changes, please set the checked parameter below to true to let others know.

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.—^{cyberbot II}_{Talk to my owner:Online} 12:25, 10 February 2016 (UTC)[reply]