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**Tristram Brelstaff** @tristrambrelstaff@mathstodon.xyz · 5d *

Tristram Brelstaff @tristrambrelstaff@mathstodon.xyz

@KanaMauna @coreyspowell It might be possible to design #sundials that would give you both the time of day relative to the axial rotation of the planet *and* a calendar date relative to the orbital motion of the two stars.

**Bruce MacDonald** @rationaldoge@hachyderm.io · Mar 9

Mar 9

Bruce MacDonald @rationaldoge@hachyderm.io

Ha! Daylight Saving Time snuck up on me. I thought it was Europe that went first but I had that backwards.

The time change suddenly shifts the transit of the sun to 1:23 pm here in Minneapolis.

That's hardly "High Noon" now, is it?

Sunday

Begin Twilight 7:07 AM

☉ Sunrise 7:36 AM
☉ Transit 1:23 PM
☉ Sunset 7:12 PM

End Twilight 7:41 PM

"Count only the Sunny Days."
—sundial at the Rose Garden, Minneapolis

#Minneapolis #DST #sundials

**Atlas Obscura** @atlas@libranet.de · Feb 5

Feb 5

Atlas Obscura @atlas@libranet.de

The Sunwheel in Hadley, Massachusetts

Each solstice, students and astronomy enthusiasts gather at a primitive but functioning sun wheel to witness how humanity first used this calendar.#solstice #sun #calendars #sundials #section-Atlas
The Sunwheel

Atlas Obscura · Feb 5The SunwheelEach solstice, students and astronomy enthusiasts gather at a primitive but functioning sun wheel to witness how humanity first used this calendar.

#sectionatlas

**David ALBERTO** @DavidAlberto@astrodon.social · Feb 1

Feb 1

David ALBERTO @DavidAlberto@astrodon.social

You won't find a #sundial as easy to make as this one.
Print, cut along the red line, fold along the dashed lines. Place along the north-south local meridian. Et voilà!

Pick your own latitude (30-60) in the pdf here:

https://www.astrolabe-science.fr/cadran-solaire-horizontal-a-replier/
#astronomy #sundials

Computer-made drawing of a round sundial with hour lines in blue, arrows indicate latitude. Red edge.

Round paper sundial, folded so that a vertical fold casts a shadow over the horizontal hour lines. On the hotizontal part, sector has been cut.

**Atlas Obscura** @atlas@libranet.de · Nov 15, 2024

Nov 15, 2024

Atlas Obscura @atlas@libranet.de

Meridian Line of Basilica di San Petronio in Bologna, Italy

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.#scienc #light #cameraobscura #instrumentsofscience #astronomy #basilicas #churches #sundials #sun #section-Atlas
Meridian Line of Basilica di San Petronio

Atlas Obscura · Nov 15, 2024Meridian Line of Basilica di San PetronioA massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.

#sectionatlas

**Annie** @theappletree@ruhr.social · Oct 2, 2024

Oct 2, 2024

Annie @theappletree@ruhr.social

Sonnenuhr in Mullaghmore
Sundial at the Mullaghmore coast

In the foreground is a granite and bronze sundial in the form of a circular coaster and an ornately forged sail with Celtic patterns. The clock stands on a massive round table made of beige-colored stone with letters and numbers engraved on the edge. In the background, the dark blue Atlantic stretches along the rugged limestone coast to the horizon under a blue sky with a few white clouds.

Im Vordergrund befindet sich eine Sonnenuhr aus Granit und Bronze in Form eines kreisförmigen Untersetzers und einem kunstvoll geschmiedeten Segel mit keltischen Mustern. Die Uhr steht auf einem massiven runden Tisch aus beigefarbenem Stein, an dessen Rand Buchstaben und Zahlen eingraviert sind. Im Hintergrund erstreckt sich der dunkelblaue Atlantik entlang der zerklüfteten Kalksteinküste bis zum Horizont unter einem blauen Himmel mit wenigen weißen Wolken in der Sonne.

#MeerMittwoch #Sundials #Sonnenuhr

**MapComplete** @MapComplete@en.osm.town · Aug 21, 2024

Aug 21, 2024

MapComplete @MapComplete@en.osm.town

Another small, recent change is on https://Mapcomplete.org/clocks, where #sundials are now shown with a different icon. I'm not very happy with the icon yet, so if there is a better design available somewhere, let me know.