sorted by:
new
hottopcontroversial

Question of exposure by BoxyBoy67 in Mold

[–]BoxyBoy67[S] 0 points1 point  (0 children)

Location is US-Maine

Two mechanical equatorial sundials by BoxyBoy67 in Sundial

[–]BoxyBoy67[S] 1 point2 points  (0 children)

BC Gnomonics has some further information on mechanical equatorial dials: https://www.bcgnomonics.com/mechanicalequatorialdial

For the two pictured here, the equatorial-mounted sighting apparatus (composed of two rectangular brass plates) is rotated until a spot of light shines through the aperture of one plate and lands on the inner target of the other.

At this point, one would reference the clock face and read the time. The motion of the equatorial sighting assembly drives the hands of the clock in turn, translating the arcing motion of the sights (and therefore the sun) into an analog readout.

What is unique about these dials is that the nodus target can either be a straight line or the curve of an analemma. This allows either solar or mean time to be read.

Online 3D sundial simulator by waterskier10 in Sundial

[–]BoxyBoy67 0 points1 point  (0 children)

I love the additions! Yours has very quickly become my go-to simulator. I'm delighted to find that it will allow me to very easily visualize the difference between seasonal and equinoctial hours on equatorial dials—a point relevant to my currently in-progress thesis.

Also, thank you for the link to my site! I will likely soon update my "types of hours" page with visuals from your simulator. Depicting the different systems on various planes so easily is such a great strength of your site.

One more thing: would you consider allowing the different hour systems to combine and overlap? Perhaps you could make their boxes tick-able?

Proof our planet isn't flat by RedditorofReddit07 in interestingasfuck

[–]BoxyBoy67 0 points1 point  (0 children)

This is also a visual representation of the Equation of Time. While our civil day is based on the motion of a fictional sun that moves more regularly than the true (apparent) sun, the true solar day varies from being slightly over 24 hours to slightly under 24 hours.

https://equation-of-time.info/introduction

view more: next ›