March equinox arriving.
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Equinox shadows are unique, says EarthSky.

Do you enjoy sundials, and shadows? Did you know that – on the day of an equinox, and only on the day of an equinox – the tip of an upright stick’s shadow follows a straight west-to-east path?

If you track the shadow’s tip (aka its terminus) as it moves across the ground on the day of the equinox, you’ll see it tracing out that straight line, as shown – beginning around 00:20 – in the video below:

Full article here.

via Tallbloke’s Talkshop

https://ift.tt/QwZhMLT

March 19, 2023 at 04:02PM