Main Calendar: Show sunrise/sunset in calendar

[Restuta]

It could be useful to show sunrise/sunset in a calendar, e.g. this is how it's currently done in my Apple Calendar:

We need to research couple of topics before doing this:

• [x] how location specific is this data (is it per entire California or per city, what is the granularity, would times be different for SF and Mountain View?)
  • it can easily be minutes, e.g. according to http://www.esrl.noaa.gov/gmd/grad/solcalc/ today Nov 11 Sunset is at 5:02PM, while in Fresno it's at 4:53PM and 4:43 at Tahoe.
• [x] is there any public database for this data we can use?
  • looks like we don't need to and the question becomes...
  • [ ] how to calculate it (see https://gist.github.com/Tafkas/4742250), see #28
• [x] can it be calcualted?
  • (yes, see below)
• [ ] does it change year to year or it's always the same and just depends on coordinates

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Definition of done

• [ ] Sunset and Sunrise are shown in the calendar based on location

  Optionally

• [ ] We might need to be smart and show it based on user's home address, but also calculate the delta with the event in a calendar and if delta is big (say > 10m difference, e.g. if I have an event in LA) notify a user with that. That can be showed like "Sunset 5:01PM (4:45PM at event's location)"

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Umbrella #22, #23

[Me4ta]

It can be calculated, yes. http://www.stevemorse.org/jcal/sunrise.html https://gist.github.com/Tafkas/4742250

[Restuta]

And also http://www.esrl.noaa.gov/gmd/grad/solcalc/, thanks @Me4ta then we need to write a tool that calculates it.