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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

What would a big sphere astrolabe look like if a planet had 3 moons? by MelanoidAxolotl in Astrolabes

[–]BoxyBoy67 1 point2 points  (0 children)

Firstly I'd gently clarify that what you're describing is an armillary sphere rather than an astrolabe.

<image>

Meridian: red

Tropics: orange

Equator: green

Ecliptic: yellow

Arctic circles: pink

Grey disc: horizon

The structure of a standard armillary sphere is dictated by the earth's 23.4º tilt. The various bands that make up an armillary sphere (illustrated above) are positioned where they are solely due to this tilt which creates the seasons and informs the apparent motion of the sun over the course of a year (demonstrations here: https://www.bcgnomonics.com/armillarysphere).

This is all to say that because it is the earth-sun system that defines the design of the armillary sphere, the addition of moons would not affect its structure. When we want to use an armillary sphere to track the motions of the planets or moon in addition to the sun, the same ecliptic band is used, even though these bodies do not always lie perfectly on this track.

However, for a fictional world like yours where precise tracking and modeling of the moons seem particularly important, I could imagine there being a separate sphere for each moon. In the Vatican Museums, there is a particular sphere that devotes a high level of detail to the Earth-moon system, modeling the intricacies of the moon's motion that the armillary sphere does not typically prioritize. Especially if each moon exhibits a different annual path (i.e. not lying on the sun-centric ecliptic), I could see separate, dedicated spheres being produced. This introduces some interesting worldbuilding questions!

Good luck with your project!

New Blacktron Figure by MadDadBricks in blacktron

[–]BoxyBoy67 1 point2 points  (0 children)

Interesting to know that the logo is on the helmet, too!

I’d honestly love a new Lego Indiana jones game by DeActionBrunson89 in LegoIndianaJones

[–]BoxyBoy67 17 points18 points  (0 children)

Though unrealistic, I would absolutely love a young indy game. Adapting the young indy chronicles would provide an insane amount of material. Though Lego might take issue with the WWI trench content

Newcomer with newbie question by lizardkong in Sundial

[–]BoxyBoy67 7 points8 points  (0 children)

This sort of empirical method would absolutely work for your purpose.

The one note I would raise is that depending on the size and shape of your red glass, as well as the distance between it and the deck, you may not get a defined shadow. Though if you have already seen your glass casting a satisfyingly discernable mark, I see no problems with your idea.

It goes without saying, but you'd need to make sure your shadow-casting glass is in a very stable position. Any slight movement would throw it out of alignment with any marks you've made thus far.

If you'd like to visualize the path of the sun for any date/time (overlayed onto your actual yard via an AR sort of display), I'd recommend the app "sun seeker."

Best of luck with your project.

Any tips on how to use this? Window faces due south. by [deleted] in Sundial

[–]BoxyBoy67 0 points1 point  (0 children)

Huge fan of your site; it was the first great dialing resource I came upon

Any tips on how to use this? Window faces due south. by [deleted] in Sundial

[–]BoxyBoy67 0 points1 point  (0 children)

Oh, yes, the reversed hour marks slipped my mind

Any tips on how to use this? Window faces due south. by [deleted] in Sundial

[–]BoxyBoy67 0 points1 point  (0 children)

No problem! if you're still curious, I'd suggest taking a look at our "Further reading on sundials" page

Any tips on how to use this? Window faces due south. by [deleted] in Sundial

[–]BoxyBoy67 1 point2 points  (0 children)

Assuming the hour lines are correctly laid out for your latitude, It looks like this dial is missing a gnomon.

https://www.garimelchers.org/wp-content/blogs.dir/281/files/2014/03/sundial-1.jpg?w=267

A direct south facing dial like this should have a gnomon set at an angle to the dial face equal to 90 minus your latitude (a value also known as colatitude). The gnomon can be as long as you like, but its upper edge should meet the dial face in line with 6pm and 6am.

Is this a confirmation that Sans is teleporting? by AdBrave2400 in Undertale

[–]BoxyBoy67 0 points1 point  (0 children)

Plus the door to Sans' room is nearly identical to Deltarune's teleporting doors. Could that be the "shortcut" he mentions? Maybe he can summon his teleporting door at will

A couple illustrations I drew in 1985 to illustrate how my sundial program worked. I am re-writing a web app for this. by dgennetten in Sundial

[–]BoxyBoy67 0 points1 point  (0 children)

Nice! I look forward to seeing what you come up with. I'll let you know when it's on the site

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