Summer (Winter) Solstice Science Experiment

Discussion in 'Off-Topic Chat' started by DublinBass, Jun 21, 2004.

  1. DublinBass

    DublinBass Supporting Member

    With today being the Summer (Winter) Solstice and all I thought I might try a worldly science experiment (if I can get some help from the tMPers).

    The idea is to compare the summer (or winter if you're from Oz) solstice in various places. All I need is your location, latitude and amount of sunlight you got on June 20th or 21st.

    Columbus, OH
    40.0 N
    15:01 hrs of sunlight
  2. :( Sorry that's a bit technical for me, when my hubby gets in from work I shall try to find out for you though, just one question, I thought a solstice was always on the 21st, June or December wherever you are in the world so why the 20th also?
  3. DublinBass

    DublinBass Supporting Member

    The summer solstice (for the northern hemispherers) is tecnically when the day when the north pole is tilted closest to the sun (about a 23.5 deg angle). Well that moment happened at around 9:00 pm EST today (for me) the 20th of June for England that would be 2:00 am the 21st of June (and in fact, 9:00 am in singapore).

    Often the local newspaper will have sunrise/sunset times (which is where I found mine).

    It's an interesting little bit of trivia that Columbus fall right on the 40 N latitude line which is probably on of two latitudes I know off of the top of my head (the other being "the 49th parallel" US/Canada border and nice orchestra/ brass band piece by Vaugh Williams.)
  4. Accidental

    Accidental Supporting Member

    Farnham, UK
    51:11 N
    16.36 hrs of sunlight.

    Have just discovered that the local sunrise/sunset times are exactly the same from 20th - 24th June - more longest week than longest day :? And what the stats don't show is, yesterday the sun hid behind clouds for approx. 10 hours and it rained instead!

    (If it helps anyone, MULTIMAP gives the longitude for your postcode)
  5. Okiedokie of Oz

    Okiedokie of Oz Active Member

    Next time, ask's bedtime now!!! I didn't exactly watch the official times!!
  6. Loop

    Loop New Member

    May diary indecates that it rose at 0431 and will set at 2206 so that would kinda make it 17h 20min give or take a few mintues. In Hull anyway.
  7. bigmamabadger

    bigmamabadger Active Member

    Do you mean sunlight or daylight? Daylight's easy, whatever sunrise/sunset occurs. Sunlight's more difficult and I think it add up to about 4 hours in my case.
    Northwich, UK, 53 16n 2 30w
  8. DublinBass

    DublinBass Supporting Member

    Would have like to get a bit more data (had to throw in the knows with the equator and arctic circle), but somewhat interesting none the less how quickly (latitude-wise) those extra hours of daylight pile up as you head far north.

  9. neiltwist

    neiltwist Active Member

    I think if you try it again, but plot modulus(daylight hours-12) on the y axis, you should get what can be approximated to be a nice quadratic which is very much related to the shape of the earth's surface.

    (send me the data over and I'll do a nice little schematic in matlab.)
  10. lynchie

    lynchie Active Member

    all i can tell you is that for the last few days the sun has been coming up far too early, and my curtains are still ridiculously thin... :evil:
  11. DublinBass

    DublinBass Supporting Member

    I was thinking that with the earth being circular, the graph resembles the tangent function. Regardless, I'll be interested to see how your data comes out :)
  12. neiltwist

    neiltwist Active Member

    actually, due to me being really quite thick until I've had a few pints, you are correct I think. I will do the stuff now though.
  13. neiltwist

    neiltwist Active Member

    ok, I'm hungry, after lunch!
  14. bruceg

    bruceg Active Member

    Kirkcaldy: 56.1214 N 17h40m daylight
  15. neiltwist

    neiltwist Active Member

    hmmm, some quite interesting results here, a cubic seems to fit nicely at the moment, but not sure why. and also thinking about it, there should be an angle offset to accompany the earth's tiltedness.

    well, green is the cubic, and red is a tangent function, and the blue is the actual data. (click for a larger version)

  16. DublinBass

    DublinBass Supporting Member

    Hmmm..... :?
  17. neiltwist

    neiltwist Active Member

    hmmm indeed
  18. Keppler

    Keppler Moderator Staff Member

  19. neiltwist

    neiltwist Active Member

    I was getting all confused, or if you were asking what it is, then it's the 'absolute value', ie, discard any minus signs.
  20. DublinBass

    DublinBass Supporting Member

    I did some research online and the latitud/ daylight relationship appears to best be describe as a parametric equation with mutiple trig functions...Its not pretty :shock:

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