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Earth Clock
wanted to build something linking electronics,
mechanics, and astronomy. I first thought about making an
orrery, but a lot of people had already made a huge amount
of them. I wanted to create something that has never been
done before, something cool and new.
I was wondering what I could do, searching for ideas
on Instructables, when I saw a contest named ’clocks’, I started
to think about a clock with an Earth globe on top of it, spinning at
the same speed as the Earth in order to see the face of our planet
exposed to the sun.
The realisation was trickier than I thought because there were
a lot of parameters to include, (the inclination of 23° of the Earth’s
axis, the difference between a stellar day and a solar day, the
modelisation of the sun, finding a way to include the rotation of the
Earth around the sun) – turns out astrophysics is hard!I
By Simon Robert hsmag.cc/eqtcnnRight
The sun is
represented by a
ring, rather than a
single LED, to better
simulate the angle
that the sun’s rays
reach Earth