Portable Solar Dial

prusaprinters

<p>Based on a description in an old (1984) education magazine I build a virtual replica of a portable sun dial which was inspired by a medieval portable sundial from Canterbury. This device is also known as a "Shepard's Dial".<br/>What I originally planned to do was make a temporal or 12-hour sun dial making it a decorative object only. This is a sun dail for modern equal hours, the example is for 52 degrees latitude, northern hemisphere. The OpenScad file is included and be set for different north-south locations.<br/>I tried to base the dimensions on proper calculations, but couldn't get it right. It looks like the original, so I did something right :-). A smarter person than me may find the proper solution.</p><p>Usage:<br/>The object requires a thin pole stuck through the proper month hole (roman numerals) until it reaches the opposite hole. Then orient the pole to the direction of the sun, so a vertical shadow appears. The end of the pole shadow should indicate the natural hour.</p><p>If the weather improves, I'll add real live images :-).</p><p>Source:<br/>The original inspiring article appeared in "BulkBoek JAARGANG 13/NR 143 from 1984". It was a special on "School Subjects in Midieval Perspective". The drawing is from J.A.F. de Rijk. <a href="https://www.bulkboek.nl/">https://www.bulkboek.nl/</a></p><h3>Print Settings</h3><p><strong>Printer Brand:</strong></p><p>Prusa</p><p> </p><p><strong>Printer: </strong></p><p>I3 MK3S</p><p><strong>Rafts:</strong></p><p> </p><p>No</p><p> </p><p><strong>Supports: </strong></p><p>No</p><p><strong>Resolution:</strong></p><p> </p><p>0.15 mm layer, 0.4 mm nozzle</p><p> </p><p><strong>Infill: </strong></p><p>15%</p><p><br/><strong>Filament:</strong><br/><br/>Any brand; PLA Colour: As you like it <br/> </p><p><strong>Notes: </strong></p><p>The four parts for the sides of a short pillar, and should be kept in place with the top and bottom (red).</p><p>The pole of 112 mm should be about 1.5 mm.</p><p> </p><p>A "M600" filament change was inserted before the second last layer.</p><p>The panels tend to warp after printing, so I used some glue in the middle of the long sides.</p><p>The original was intended with the MMU2 and printed upside down, but the results looked less good.</p><h3>How I Designed This</h3><p>Mainly by reading the relevant Wikipedia topics:</p><p><a href="https://en.wikipedia.org/wiki/Sun_dial#Vertical_sundials">https://en.wikipedia.org/wiki/Sun\_dial#Vertical\_sundials</a></p><p><a href="https://en.wikipedia.org/wiki/Solar_zenith_angle">https://en.wikipedia.org/wiki/Solar\_zenith\_angle</a></p><p><a href="https://en.wikipedia.org/wiki/Position_of_the_Sun#Declination_of_the_Sun_as_seen_from_Earth">https://en.wikipedia.org/wiki/Position\_of\_the\_Sun#Declination\_of\_the\_Sun\_as\_seen\_from\_Earth</a></p><p> </p><p> </p><p> </p><p>Category: Physics &amp; Astronomy</p>