Changes in sunrise and sunset

[Rwood]

(it's possible this has been done before ….

At this time of year our days are shortening at about 2 minutes 45 seconds per day in central regions - a bit less in the north, a bit more in the south. The evenings are drawing in more quickly than the mornings (this applies from about 12 February to 15 May) because the sun's daily trips from zenith to zenith are shorter than 24 hours (see internet explanations re The Equation of Time). Things are more interesting at latitudes inside the tropics - not so much at the equator, where daylength is almost constant but sunrise and sunset both get about 18 minutes earlier during this period - but at latitudes where either sunrise or sunset (but not both) stay almost constant because the lengthening/shrtening of the days balances the equation of time effect.

At latitude 8.45 South sunrise times only vary by 2 minutes from about 10 February to 12 May (while sunsets get 38 minutes earlier). At the same latitude North, sunset times have the same pattern.


At around 10.30 latitudes in the northen autumn/southern spring a similar pair of effects occurs.

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[PaulMy]

The beteljuice's DEMONstration Page gives a nice day graph adaptable for any location Komoka Weather.  Just haven't found an option for play with different date, i.e. fall, spring...


Enjoy,
Paul
 

[Rwood]

DEMONstration Page[/url] gives a nice day graph adaptable for any location Komoka Weather.  Just haven't found an option for play with different date, i.e. fall, spring...


Enjoy,
Paul

Yes, attractive graph! I had also forgotten your latitude was only around the 42 mark ...

[beteljuice]

@PaulMy

Either graphic, nearly all parameters are 'postable'

So ...

Code: [Select]

// date / time is default 'now' for locale set - override 'now' by php?event=[unix timestamp]
Edit;