Talk:Solar apex

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Re: "...discussions regarding the solar passage through the arms of the Galaxy..."

Am I missing something or is this just wrong?

it seems logical that the sun is a member of a galactic arm and not just visiting; otherwise galactic arms would not form; only a random scattering of objects would exist. It's like suggesting that planets regularly pass through solar systems rather then belonging to them.

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There is a factor of ten discrepancy in this article between the reported orbital speed of solar system and that of neighboring stars: "orbital speed is 217 km/s" and "...is always between 20 and 25 km/s for the Sun's neighbours" .

Spiral arms

The spiral arms are regions of enhanced gas density, leading to enhanced star formation and hence many more young, hot (and therefore luminous and blue) stars than other parts of the galactic disk. This is what gives the arms their prominence, but it doesn't mean that there aren't stars between the arms (there are many, just older and so there are no luminous blue stars, hence not so visible). Also, the stars orbit at a different rate to the arms and regularly pass through them. Our sun happens to be close to the edge of an arm, but I don't think we're in one. 152.78.192.216 17:54, 23 October 2007 (UTC)

This article was pretty much wrong! The local standard of rest is very important in this respect. Cheers, Jeffrey --82.136.242.69 (talk) 11:17, 22 January 2009 (UTC)

Is it just me or shouldn't the sun have reached Vega already? The Earth is roughly 4.5 billion years old and if we assume the sun is at least as old and have been in movement since then, the 16.5km/s would have had it travel the 25 light-years to Vega by now. Quite some time earlier, even. — Preceding unsigned comment added by 109.58.48.18 (talk) 14:22, 1 November 2011 (UTC)

I feel like you are assuming that the sun formed at the distance from Vega that it is now, as opposed to only being this close now because it has been moving in that direction for a few billion years. Darryl from Mars (talk) 01:30, 19 June 2012 (UTC)

Sources and consensus

The article gives very precise values for the direction and speed of the Sun. But the source of this information is not given.

The motion of the Sun to its apex is the motion w.r.t. the stars in its neighbourhood; more precisely the "Local Standard of Rest", that is the motion superimposed on the orbital motion around the center of the galaxy, that it shares with the stars in its vicinity.

In fact in literature there are wildly different estimates for both the ideal (or average) circular orbit around the Milky Way at the location of the Sun, and of the velocity vector of the Sun w.r.t. this LSR. Some recent publications (check the tables in the introduction listing results from various authors):

http://adsabs.harvard.edu/abs/2009NewA...14..615F

http://adsabs.harvard.edu/abs/2010MNRAS.403.1829S

http://adsabs.harvard.edu/abs/2011MNRAS.412.1237C

From the velocity components of the first (U=+7.5 km/s, V=+13.5 km/s, W=+6.8 km/s) I compute for the apex: l=61°, b=+24° = RA=271° = 18:05, DEC=+35°

Tom Peters (talk) 21:03, 17 March 2013 (UTC)

Religious & Empirical Significance

–––– — Preceding unsigned comment added by 66.190.59.178 (talk) 05:22, 2 May 2014 (UTC)

Where the hell is this Surah Ya-Sin passage coming from? Can a citation be provided for this information or is this based on opinion. The vagueness of the quote in question doesn't lend itself necessarily to the theory stated. — Preceding unsigned comment added by 66.190.59.178 (talk) 05:19, 2 May 2014 (UTC)

This is astrological nonsense and should be deleted from this article.

65.215.33.194 (talk) 19:46, 18 September 2014 (UTC)