A winter solstice science experiment

Apologies for the Winter solstice sunset photo, pretty boring, but it was cloudy this week and I had to work late so it was taken from work around 5.10 pm a few days later near my desk.

Some boring statistics above.

I wheeled out the bike into the sun which is right on winter solstice time. 11-30am 21st June 2021. I’m not too worried about the sun this time of year. In the summer I totally respect its human flesh frying potential.


That’s a long shadow for the middle of the day, longer than I am high. Which gives me an idea.

Some calculations. Perth’s latitude is 32 degrees, same as Savannah USA and the Earths tilt is 23 deg. 44 min.

A very rough measurement.

Phew..there are some theorists, some might say conspiracy theorists, that believe the Earth is flat and Australia is a mythical place invented by one world government and paid actors in Hollywood are fooling us. Could I be a Bernard Truman (from the Truman Show) who is the only one not in on it. Thankfully with my calculations and the fact I almost froze my ears off yesterday morning in sub-zero temperatures whilst you Northern Hemisphere-ites are sweltering. I’m 99.99994% sure the world is round.

I live in the hills just east of the city of Perth, Western Australia and I've loved cycling all my life, From riding to primary school when I was 8 years old to cycle touring as a grumpy old man. Cycling is freedom on two wheels and I love getting on my bike at any opportunity.

6 response to "A winter solstice science experiment"

  1. By: Rich-Illinois Posted: June 27, 2021

    Interesting how all that works out isn’t it?
    Winter Solstice here, the noon sun is roughly 26 degrees above the horizon — producing very long shadows as well.

    Another interesting thing to do is — Lay a ruler between bright sun and a sharp shadow line and watch the shadow creep across the ruler — in fact, its moving at the same rate as the hour hand on a clock — go figure! 🙂

    • By: Lednar De Nalloh Posted: June 29, 2021

      My angle was out by a few degrees but it was a bit rough. Not sure the ruler was perpendicular.

  2. By: gregblood Posted: June 27, 2021

    I didn’t think your Winter Solstice photo was boring. But I did think your diagram was . . . I just don’t have much of a scientific mind.

    • By: Lednar De Nalloh Posted: June 29, 2021

      It’s never too late to turn into a nerd.

  3. By: Suzanne Posted: June 27, 2021

    I am sooo impressed by your higher mathematics! I can’t even tell if you are serious or practicing for MWGA.
    I like the solstice shot from your work place, too.

    • By: Lednar De Nalloh Posted: June 29, 2021

      Thanx Suzanne, I’m sure there’s some errors in my calcs in there somewhere

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