#sundial — Public Fediverse posts

#astronomy

For #SundialSunday, this vertical #sundial on Hôtel de la Bertaudière, where privateer Surcouf has lived. Saint-Malo, France.
My calculated true solar time is 12:53 for this photo: not bad!
This sundial is declining slightly southeast.

#astronomy

For #SundialSunday, this vertical #sundial on Hôtel de la Bertaudière, where privateer Surcouf has lived. Saint-Malo, France.
My calculated true solar time is 12:53 for this photo: not bad!
This sundial is declining slightly southeast.

#BloomScrolling #sundial

#BloomScrolling #sundial

Love the Sun, Moon and Stars? Handheld Portable Sundial See it here: https://www.shopwavytail.com/product/handheld-portable-sundial #astrolabes #sundial

Love the Sun, Moon and Stars? Handheld Portable Sundial See it here: https://www.shopwavytail.com/product/handheld-portable-sundial #astrolabes #sundial

#astronomy
Ancient astronomical instruments at the Musée de la Marine, Port-Louis, France.
Wooden persian 'astrolabe quadrant', 19th
Brass Moroccan astrolabe, 19th
Terrestrial compass, ~1640
One of the famous 'Bloud' diptych #sundial, ivory, ~1670

...

#astronomy
Ancient astronomical instruments at the Musée de la Marine, Port-Louis, France.
Wooden persian 'astrolabe quadrant', 19th
Brass Moroccan astrolabe, 19th
Terrestrial compass, ~1640
One of the famous 'Bloud' diptych #sundial, ivory, ~1670

...

This cracked #sundial is waiting for sunlight in front of a bar…
Seen in Carcans (33) France.
#Astronomy

This cracked #sundial is waiting for sunlight in front of a bar…
Seen in Carcans (33) France.
#Astronomy

#astronomy #science

Don't mind me, I'm just dreaming I was one of Delure's wealthy clients in Paris, commissioning this lovely double #sundial in the 18th c...
The octagonal part is a horizontal sundial, working with the shadow of the tilted edge of the triangle.
The oval is an analemmatic sundial, working with the upright edge of the triangle. The user needs to set the date by sliding the octagon until its edge reaches the current date on the calendar.
These sundials generally have to be oriented along north-south, but this one is self-oriented: rotate it until the shadows of both edges tell the same time. This is possible because the 2 edges have different directions. The sundial then also indicates *true* north.

The hour lines are computed for latitude 42°N (Rome), but if you tilt the sundial you can make it work for higher latitudes. A list of cities with their latitudes is provided. A small graduated arrow helps find the correct angle.

Once you have enthralled your guests with this exquisite object, you can set out on a trip to Europe, carefully folding the sundial into its 8cm case.

All photos from M. Delalande, auctioneer. Dated around 1710-1720. The Adler Planetarium (Chicago) owns another copy.

#astronomy #science

Don't mind me, I'm just dreaming I was one of Delure's wealthy clients in Paris, commissioning this lovely double #sundial in the 18th c...
The octagonal part is a horizontal sundial, working with the shadow of the tilted edge of the triangle.
The oval is an analemmatic sundial, working with the upright edge of the triangle. The user needs to set the date by sliding the octagon until its edge reaches the current date on the calendar.
These sundials generally have to be oriented along north-south, but this one is self-oriented: rotate it until the shadows of both edges tell the same time. This is possible because the 2 edges have different directions. The sundial then also indicates *true* north.

The hour lines are computed for latitude 42°N (Rome), but if you tilt the sundial you can make it work for higher latitudes. A list of cities with their latitudes is provided. A small graduated arrow helps find the correct angle.

Once you have enthralled your guests with this exquisite object, you can set out on a trip to Europe, carefully folding the sundial into its 8cm case.

All photos from M. Delalande, auctioneer. Dated around 1710-1720. The Adler Planetarium (Chicago) owns another copy.

#Astronomy
New meridian #sundial in Paris, at the Université Paris Cité (campus Grands Moulins).

More about the project (in french):
https://www.youtube.com/watch?v=t4sH8lbJabI

#Astronomy
New meridian #sundial in Paris, at the Université Paris Cité (campus Grands Moulins).

More about the project (in french):
https://www.youtube.com/watch?v=t4sH8lbJabI

@sethlombardy very good :,D #gnomon is not for everybody :awesome_rotate: https://en.wikipedia.org/wiki/Gnomon #sundial

@sethlombardy very good :,D #gnomon is not for everybody :awesome_rotate: https://en.wikipedia.org/wiki/Gnomon #sundial

Passing through the airport today, I overheard someone talking about the mysterious #moondial of #Ballintoy parish church in #NorthernIreland.

I had never heard of a moondial before and it instantly fascinated me. I just found a photo that shows that the front face is a #sundial but the side face is a moondial or #tidal clock.

I need to visit this church and learn more. Moondials must be incorporated into the mythology of #Pelagia, goddess of the moon and the tides!

#TTRPG #DCC #RPG #DCCRPG

Passing through the airport today, I overheard someone talking about the mysterious #moondial of #Ballintoy parish church in #NorthernIreland.

I had never heard of a moondial before and it instantly fascinated me. I just found a photo that shows that the front face is a #sundial but the side face is a moondial or #tidal clock.

I need to visit this church and learn more. Moondials must be incorporated into the mythology of #Pelagia, goddess of the moon and the tides!

#TTRPG #DCC #RPG #DCCRPG

In 2013, archaeologists from the University of Basel conducting excavations in Egypt's Valley of the Kings unearthed a limestone tile. Initially unremarkable, this piece of rock revealed its historical significance as one of the world's oldest #sundial​s, dating back to the 13th century BC. "Ra" was developed to bring this 3200 year old artifact back to life.

https://www.thomasweibel.ch/ra/

#archaeology #history #astronomy #webdev #opendata @OpendataCH

In 2013, archaeologists from the University of Basel conducting excavations in Egypt's Valley of the Kings unearthed a limestone tile. Initially unremarkable, this piece of rock revealed its historical significance as one of the world's oldest #sundial​s, dating back to the 13th century BC. "Ra" was developed to bring this 3200 year old artifact back to life.

https://www.thomasweibel.ch/ra/

#archaeology #history #astronomy #webdev #opendata @OpendataCH

New on my #blog: https://aspi.blog/2026/06/12/arisaig-2026-8-the-grounds-of-canna-house/
Continuing my account of my recent Scottish holiday with a look at the grounds of #CannaHouse (we were not on the island long enough to go into the house, which can only be done if one books a tour).
#blogging #blog #photography #Scotland #Arisaig2026 #Canna #CannaHouse #Gardens #Plants #insects #HistoricRelics #"InformationTrays" #Sundial #NationalTrust

New on my #blog: https://aspi.blog/2026/06/12/arisaig-2026-8-the-grounds-of-canna-house/
Continuing my account of my recent Scottish holiday with a look at the grounds of #CannaHouse (we were not on the island long enough to go into the house, which can only be done if one books a tour).
#blogging #blog #photography #Scotland #Arisaig2026 #Canna #CannaHouse #Gardens #Plants #insects #HistoricRelics #"InformationTrays" #Sundial #NationalTrust

I finally managed to color countries in my map for the refraction horizontal #sundial
Round map with hour lines, to be placed under 5cm acrylic glass.
The flower's shadow tells solar time and the place where the Sun is overhead. Here off the coast of west Africa, heading to Cuba.
Layout made with a #Python script using #matplotlib and #geopandas

#astronomy #sundial #science #education #maps

I finally managed to color countries in my map for the refraction horizontal #sundial
Round map with hour lines, to be placed under 5cm acrylic glass.
The flower's shadow tells solar time and the place where the Sun is overhead. Here off the coast of west Africa, heading to Cuba.
Layout made with a #Python script using #matplotlib and #geopandas

#astronomy #sundial #science #education #maps

#astronomie #astronomy #sundial #cadranssolaires

Le n°53 de Cadran Info, revue de la Commission des cadrans solaires de la
@safastrofrance.bsky.social
, est paru.
PDF sur abonnement. Je rappelle que les numéros datant de plus de 5 ans sont en libre accès ici :
https://ccs.saf-astronomie.fr/cadran-info/

#astronomie #astronomy #sundial #cadranssolaires

Le n°53 de Cadran Info, revue de la Commission des cadrans solaires de la
@safastrofrance.bsky.social
, est paru.
PDF sur abonnement. Je rappelle que les numéros datant de plus de 5 ans sont en libre accès ici :
https://ccs.saf-astronomie.fr/cadran-info/

RE: https://mastodon.social/@gnomonique/116611291031379723

Pour les amateurices de cadrans solaires ☀️
Récupérez votre exemplaire ici 👇
#sundial #cadranssolaires

RE: https://mastodon.social/@gnomonique/116611291031379723

Pour les amateurices de cadrans solaires ☀️
Récupérez votre exemplaire ici 👇
#sundial #cadranssolaires