CityCyclingEdinburgh was launched on the 27th of October 2009 as "an experiment".
IT’S TRUE!
CCE is 15years old!
Well done to ALL posters
It soon became useful and entertaining. There are regular posters, people who add useful info occasionally and plenty more who drop by to watch. That's fine. If you want to add news/comments it's easy to register and become a member.
RULES No personal insults. No swearing.
One for the scientists (amateur or professional) of CCE
September/October has always been a good time for good sunrises and sunsets, especially as they occur around commute time, but this year's seem to be better than I remember.
Is this down to chance, or something more sinister like pollution/global warming? Or Brexit?:-)
The length of time it takes for the sun to go from wholly visible to wholly occluded by the horizon varies with the distance from the equator combined with the seasonal variation caused by the earth's axial tilt. A sunrise/sunset calendar will show this variation throughout the year. In summary: if the sun is directly overhead at noon, sunrises and sunsets are over more quickly than they would be if the sun was not directly overhead at noon. In slightly more detail: the apparent angular velocity of the sun doesn't change much, so a sun with apparent motion perpendicular to the horizon will move from before it to beyond it more quickly than a sun with an oblique path, which has to cover greater overall apparent distance to achieve the same vertical component (its own apparent height).
The momentary appearance of a sunset at any time is entirely down to atmospheric conditions - particles, thermoclines and whether or not there are any clouds to be illuminated by the affected light. These can vary seasonally. Changing weather patterns could result in relative local differences in atmospheric pressure, humidity, particles, temperature gradients etc. but these can only affect the appearance of a sunrise or sunset if they happen to end up in the right place to divert photons from the atmosphere into your eyes at any given time.
Interesting cloud formations make better sunsets. Interesting clouds are usually due to changeable weather, which we have in spades at this time of year.
Or brexit if you prefer :)
The smoke from bonfires of corpses of cows killed after BSE outbreaks would have had noticeable local effects on sunsets, so the badger cull might be very slightly responsible if they're burning them with lots of moist green wood and leaves.
The smoke from bonfires of corpses of cows killed after BSE outbreaks would have had noticeable local effects on sunsets
CCE gold.
So, the smoke from disposing of all those burgundy passports.
Excellent - knew I'd get a mix of informative and "tangential" responses. Great work!
Really enjoyed reading this thread (almost as much as the snail one) :D
Not as pretty as the BBC ones but here are my photos of the sunrise/sunset from the last couple of days.
IMG_20181019_074832941 by Bill Harriman, on Flickr
IMG_20181024_180139222_2 by Bill Harriman, on Flickr
Heavy pollution can create some very red sunsets. The best I saw was in Santiago from a hill just above the smog level.
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