Talk:Limb darkening

message: It occyurs to me that another cause of limb darkening might be because faculae - particularly bright features on the solar photosphere - occur in the "canyons" between solar granules, and so when looked at from an angle they'd be partially obscured by the dimmer granule plasma. I have no idea how much of an effect this would have, though, so I'm reluctant to just toss this into the article itself. Bryan 04:05, 23 Jan 2005 (UTC)

message: Hi. I came here trying to find out what Newton meant by superior limb of the sun as quoted in Webster (definition 1).  The dab for limb has a picture but doesn't link here, so I linked it here.  Should there be a Limb (astronomy) as suggested by the dab page, or should it be part of this page, perhaps with the picture of the moon? But the moon isn't really a star… so, it doesn't experience limb darkening (oops).  Or does it? But I'm not here to ask an astronomy question, I'm here to discuss how to improve the articles. I'll try to fix the dab so it doesn't imply that the moon is a star. 「ѕʀʟ·✎」 10:08, 31 December 2007 (UTC)
replies: text: Phases of Venus mentions 'apparent disk' and moon mentions the 'limbs' which links to wiktionary (??). 「ѕʀʟ·✎」 10:17, 31 December 2007 (UTC)

text: The papers mentioned in Mariner 2#Scientific observations also use limb darkening for the planet Venus, so I guess the term limb darkening is not only used for stars. Van der Hoorn (talk) 00:41, 15 February 2009 (UTC)
thread_title:  What is a limb, anyways? 

message: Something is badly missing in this article, namely a mention of what physical process is responsible for the limb darkening. After all, in the optical region of the spectrum there is no continuous absorption or scattering for hydrogen in its ground state.
Thomas  — Preceding unsigned comment added by 86.25.189.56 (talk) 12:27, 21 December 2012 (UTC)
replies: text: How does 6000 kelvin hydrogen behave?  I am fairly certain that it behaves as a black body emitter. Rockphed (talk) 17:37, 1 August 2019 (UTC)
thread_title:  Cause of Limb Darkening 

message: The "more conveniently written" equation could also be written in terms of the original coefficients. Deriving it from the earlier equation, it would be
:
\frac{I(\psi)}{I(0)} = 1+\sum_{k=1}^N a_k \, (\cos^k(\psi)-1)
Shawn  — Preceding unsigned comment added by Sdivitt (talk • contribs) 08:44, 9 May 2013 (UTC)
thread_title:  alternative equation 

message: My Cambridge Encyclopaedia of Astronomy (they used to make encyclopaedias out of trees, once) mentions the limb darkening of some planets and moons. Presumably this is a different effect, but why doesn't the article mention it? Stub Mandrel (talk) 21:14, 3 October 2015 (UTC)
replies: text: I will have to look into that, but perhaps it is related to uneven lighting similar to dawn and dusk on earthRockphed (talk) 18:12, 1 August 2019 (UTC)

text: I agree.  I came here directly from the article Atmosphere of Titan, wondering what limb darkening could mean (as English isn't my first language).  I got not much answer from this article. Fomalhaut76 (talk) 10:54, 18 April 2023 (UTC)
replies: text: I have added mention in the lead that the effect is also observed on planets, and I have provided a new ref. CoronalMassAffection (talk) 14:23, 19 April 2023 (UTC)
thread_title:  Limb darkening of planets