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Author Topic: An anticrepuscular ray!

Offline Perikles

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An anticrepuscular ray!
« on: Fri 22 Jun 2012, 13:01 »
I've put in Tenerife chat, because this phenomenon is rare, but visible in Tenerife when conditions are right. I saw this this morning, and posted it on a science forum because I didn't know what it was. Now I do.

Джереми. Prurio ergo sum
κατθάνοισα δὲ κείσῃ οὐδέ ποτα μναμοσύνα σέθεν ἔσσετ' οὐδὲ †ποκ'†ὔστερον• οὐ γὰρ πεδέχῃς βρόδων τῶν ἐκ Πιερίας•

Offline Nova

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An anticrepuscular ray!
« Reply #1 on: Fri 22 Jun 2012, 15:49 »
Great picture, but do we get an explanation?  Or are we just expected to google it ourselves?  :whistle:
If you are always trying to be normal, you will never know amazing.

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Offline Perikles

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An anticrepuscular ray!
« Reply #2 on: Fri 22 Jun 2012, 15:57 »
LMGTFY: At sunrise, you get rays spreading out from the sun in a fan-shape. Rosy-fingered dawn (Homer). It turns out that these rays actually carry on and meet at the horizon 180 degrees away, where of course they converge. I didn´t know that, but it's predicted by Mie theory, which Janet knows nothing about. Live and learn.

(That was a sly reference to a translation I'm doing which mentions Mie theory. Janet was proofreading, and thought it was a typo  :giggle:)
Джереми. Prurio ergo sum
κατθάνοισα δὲ κείσῃ οὐδέ ποτα μναμοσύνα σέθεν ἔσσετ' οὐδὲ †ποκ'†ὔστερον• οὐ γὰρ πεδέχῃς βρόδων τῶν ἐκ Πιερίας•