Portable Sundial
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This sundial uses magnets to automatically line up. It also has to float on water, and hence it must be waterproof.
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- Printables
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- Portable Devices
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- Creative Commons — Attribution — Noncommercial
This is the third model I designed. The outer base has holes in the bottom so you can glue in spherical magnets (that is how it works). I included some supporting structure, as I did not used to use a slicer that was good at generating supports; the four spindly legs are meant to be broken off, of course. The ridges in the top allow you to place the insert in to account for your declination (difference between true north and magnetic north) to the nearest forty-eighth of a turn; zero should point due south.
To tell time, float the sundial in water and let it automatically level and align itself; of course, this will only work if you inserted the magnets correctly. The insert piece has helpful markings that allow you to tell time. Each of the parallel arcs represent hours that correspond to the numbers on the sundial; as most of these touch two numbers, you will know which it is because the hour closer to noon will appear closer to the gnomon.
The arcs that meet at 6 and 18 correspond to different latitudes; particularly, they show the ecliptics (path the sun travels in throughout a day) for these latitudes at an equinox. These include the equator, the boundaries of the tropics and polar regions, and the latitude lines 45 degrees each way of the equator. Each spot where your gnomon's shadow falls on the equinox is on your ecliptic arc.
That piece shaped like the number 8 represents an analemma (path the sun travels at a certain time of day, throughout a year). Put the notch on your ecliptic arc so it touches the gnomon's shadow (you may need to use tape). There is an odd thing called the equation of time, meaning that sundials are slightly off at certain times of the year; the real time is that which is shown at the crossover of the analemma.
For more information, see the video:
I used the following sources:
Dittren, Natalia. “Motions of the Sun Simulator.” GitHub, ccnmtl.github.io/astro-simulations/sun-motion-simulator.
“Sun Position.” Sun Earth Tools, 2009, www.sunearthtools.com/dp/tools/pos_sun.php?lang=en.