Latest posts tagged with #Sundials on Bluesky
2 #relojesdesol en una #iglesia del municipio de #Meis (#Pontevedra)
2 #reloxosdesol nunha #igrexa do #concellodeMeis (#PO)
#gnomon #rellotgesdesol #relógiosdesol #sundials #sonnenuhr #cadranssolaires #orologisolari #solur #aurinkokello #日時計 #church #gnomónica #comarcadosalnés #salnés #galiciamola
Happily listening to Arpine Asryan about the introduction of #sundials to Armenia in the seventh century 🥰☀️🕒
This photo is of a analemmatic type of sundial in the front of the UPrep High School central building in Wedgwood Neighborhood. The design is described below. The sundial is an iron gray cylinder with stainless steel lettering, indicating the hour of the day along the sides. Stainless steel lettering also designate the lines for the winter equinox at the top, both solstices at the middle and summer equinox at the bottom. There is a handle at the bottom, about waist height, to move the gnomon so that the sunlight can strike its slit and fall on the correct hour of the day. The sundial is oddly attractive, looking a bit like a welded futuristic rough idea of a robotic Dakek. ( The followin is from https://sundials.org/index.php/sundial-registry/onedial/746) A unique, 10 foot tall, 2 foot diameter (base) tapered cylinder dial similar to a traditional shepherd's dial except that the cylinder orientation is fixed and the gnomon is rotated about the dial axis by the user to align with the sun. Time is read from the vertical hour and date lines. The dial is fabricated from bronze plate and is hollow. Lines are formed by individually cut hour and date line segments welded on from inside the cylinder. A lever at hand height is moved to rotate the gnomon to face the sun, providing a vertical shadow. A slit in the gnomon tip provides a more accurate sun spot on the dial face.
Went to check the analemmatic sundial at Uprep HS, and it works very well in winter! This is at high noon (the sun is still winter low)
#Photography #SeattleWashington #SeattleWinter #AnalemmaticSundial #UPrep #Sundials
One day a year on the summer solstice, it perfectly aligns to the markers around the plaza at the northern end. The shadow sweeps across the plaza at approximately one foot per minute. #Bridges #Sundials #California #Redding
map of the USA with state borders and dots. States are filled in green according to the number of sundials per state (pale green if ~0, up to dark green:35).
🔭🧪 #maps #sundials
Did you know you could register sundials on OpenStreetMap @openstreetmap.bsky.social ?
Only 247 in the USA so far, but many are missing here.
A more comprehensive map can be seen on the NASS website (North American Sundial Society).
sundials.org/index.php/su...
A meme with four images and advice for resetting them for Daylight Savings Time. Image 1 -- "A Smartphone: Leave it alone, it does its magic." Image 2 -- "Sundial: Move one house to the left." Image 3 -- "Oven: You'll need a Masters in Electronic Engineering or a hammer." Image 4 -- "Car Radio: Not worth it, wait six months."
Reminder to folks in the USA:
You need to set your clocks back again.
(It's #HootinTootinTuesday on a weekend, just for #DaylightSavingsTime .)
#Timezones #Daylight_Savings_Time #DaylightSavings #ClocksChange #ResettingYourClocks #Clocks #Sundials #SundialSunday #SundialsOfMastodon
Sundials.jl v5.0: Update to SUNDIALS v7 and Improved DAE Initialization
A major update that brings significant improvements to differential-algebraic equation (DAE) solving and upgrades to the latest Sundials C library
sciml.ai/news/2025/09...
#julialang #sciml #sundials #dae
A black and white film photo. Five people can be seen far below during a very sunny day so that it appears that they are mini sundials at the Indycar race at Iowa Speedway in Newton, Iowa. Saturday, July 12, 2025.
Sundials • Newton, Iowa, USA
Rolleiflex 3.5 MX-EVS • Kodak Tri-X 400 • 2025
#FilmPhotography #Kodak #TriX #Camera #Film120 #MediumFormat #Rolleiflex #BWfilm #Monochrome #Photography #Newton #Iowa #Speedway #Outdoors #Sundials #Sun #Shadow #Indycar #July_12_2025
Various types of sundials on display
Various types of sundials on display
Saw the craziest variants of #sundials in the Germanic National Museum in #Nuremberg today. Cylindrical, octaedrical, cubic, like a funnel, etc etc pp. 🔭☄️
A curious little story. The world's biggest sundial that wasn't.
'To mark its centenary in 1995 the British Astronomical Association NSW Chapter wanted to build the world’s largest sundial. It had identified three potential sites on the 150th meridian: Bermagui, Lithgow and Marulan.'
Well […]
2 drawings of portable sundials with a tilted grid above vertical hour lines.
2 photos of vertical cylindrical sundials.
Drawing of lines meant to be wrapped around a horizontal cylinder.
Here are a few other #sundials from Hartmann.
1st one could easily made from paper, with a moving arm.
The others could be printed and wrapped around a cylinder (soda can?).
One day, when the rate of new incoming projects begins to calm down, maybe I'll do that...
3 wooden astronomical instruments on a shelf, against a white wall: celestial globe, planispheric astrolabe, armillary sphere.
Several wooden sundials next to an armillary sphere: a square Oughtred's double sundial, a navicula, an equinoctial ring. Top of an equatorial sundial.
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My gnomonic shelves are a bit busy right now... #sundials
Could you name all of these astronomical instruments? (names in the alt text).
I’ve never seen a sundial clock on a building before. Not sure what they do for daylight savings time…
Reed College, Portland, 2024
#photography
#clocktowers
#sundials
Horizontal paper sundial. A vertical fold casts a shadow on the radial hour lines.
Red circle with blue lines as hour lines, digits 5 to 19.
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 file here:
www.astrolabe-science.fr/cadran-solai...
🔭 🧪 #Edusky #sundials
sundial bridge
#sundial #sundials #sundialbridge #bridge #bridges #travel #traveling #wanderlust #glow #evening #lights #pink #bridgephotography #photography #california
South-facing sundial at winter solstice. Times says 10:55 but clock time is 10:41
East-facing sundial at winter solstice. Dial reads 10:57, but clock time is 10:41
Our #sundials this morning at #winter #solstice.
The green markings are for British Standard Time, and White for Summer Time. Both dials were plotted out over the space of a year, rather than by calculation.
#D&G #Scotland
map with a lot of small orange dots on a lavender background. The dots draw a map of France. The dots are unevenly distributed.
A choropleth map of France (yellow-green to orange), indicating the number of sundials in France per departement, including overseas depts. Data : 2022. SAF.
🔭 #maps
How many #sundials in France?
The Société Astronomique de France keeps an account of the +33k french sundials.
Many people think sundials are useless in northern France & Brittany, due to weather. This map says it's not as simple.
My 1st try in #cartography with Geopandas #python.
A vertical line marked « XII » drawn on old stone work with statues. Above is a cast iron tripod holding a metallic disk with a hole. This meridian was built in 1753 and moved in 1826.
On the tower of an old building : a tripod hanging high above ground and supporting a golden disk. No line is visible on the wall just below.
A southern vertical sundial with hour lines ranging VI to V. Latin motto: « ultima quando » (« when will be the last (hour)? » This sundial is dated 17th century.
🔭🧪
Chasing #sundials in Rouen, France.
- a meridian in the city hall’s gardens, restored around 2019.
- another meridian behind the cathedral. The golden gnomon remains (no markings on the wall).
- a southern sundial on the side of Saint-Vivien church.
More info in ALT Texts.
A meridian carved in an ancient building. There's a sun-shaped piece above the meridian. When its shadow passes on the 8-shaped line, it's mean solar time. Zodiac signes carved. Diagonal lines give the path of the shadow on given days. There's also a standard sundial juste above the meridian on the wall, but almost erased ; you can see the arrows of the hour lines. This building has a sign "maison du cadran" (sundial house).
A sundial facing almost due south. The gnomon's shadow says it's just before 5pm. Given the time I took the picture, and accounting for the time zone, equation of time and longitude of the place, the time is correct within 5 minutes or less.
Sundial drawn on a white stone square, hour lines between 5 to 11 am solar time. The gnomon is pointing upwards (toward north celestial pole), showing it's a northern sundial, which is lit only in spring-summer, and only early in the morning. At this latitude, only hour lines 5 to ~8 as useful.
🔭🧪
Spent a couple hours chasing old and new #sundials in Bayeux, Normandie, France, home of the famous tapestry.
1)A meridian giving true solar time and mean solar time.
2)A near-southern sundial.
3)A rare north-east sundial.
Couldn't spot the 4 old sundials on the cathedral: they stand 30m high.
Set of 5 diagrams showing hour lines for 5 sundials: horizontal and 4 vertical (south, west, east & north)
a cardboard box width diagrams pasted on one side and on the top. Triangular paper gnomons stick out of the box, and cast their shadows on the hour lines. The south sundial reads approx.1:20 pm (solar time)
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Hour lines for several #sundials: facing south, east, west, north and horizontal.
Those diagrams can be pasted on a cube to make your own multiple sundial. Each face needs a gnomon of the proper dimensions. The east and west sundials just need a straight rod perpendicular to the plane.
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