Latest posts tagged with #Timekeeping on Bluesky
What if #timekeeping is not about measuring time …
but about stabilizing a system through constrained dynamics?
In this conceptual note, I show how a classical clock maps directly onto the Compression–Response Transition Index (CRTI), … doi.org/10.5281/zeno... 🖖
Before time lived on our wrists, it lived in shadows, water, gears—and finally in our pockets. Take a quick tour from sundials to pocket watches and see how timekeeping became personal.
dearjunecollectibles.com/from-sundial...
#antiques #collectibles #vintagewatches #pocketwatch #timekeeping
thirteen bearded men in robes sit and lean around a white‑clothed table in a dim interior. The central figure stands slightly behind the table, raising one hand as he speaks, while the others react with animated gestures and varied expressions, some turning toward him, some arguing among themselves. Plates of bread, a fish, cups of wine, and glass flasks are scattered on the table, with bare feet and legs visible beneath. At the bottom of the scene sit a brass basin, a metal flask, and a small dog curled on the floor near the right corner. Last Supper painting by Jacopo Bassano c. 1546 courtesy of Galleria Borghese #144
For those who observe, remember that the new commandment given this night is to love one another.
#LastSupper ( #MaundyThursday) is associated w/ a #Passover seder observed by Jesus
hence the " #fullmoon after #vernalequinox" part of dating #Easter Sunday
#calendar #timekeeping #astrophysics 🍎
An open medieval Hebrew manuscript with two facing pages of large black calligraphic text on aged, yellowed parchment, lightly stained and worn. Along the bottom margin runs a colorful illustrated scene: on the left page, a figure in a pointed hat bakes round flatbreads in a brick oven while another figure carries a tray of three yellow round loaves. On the right page, several similarly dressed figures in pointed hats and robes stand behind or push carts piled with the same round loaves, one holding up a cup as if making a blessing. The Birds' Head Haggadah c.1300 Isreal Museum #199815 via Wikimedia Commons
To those who celebrate, chag pesach kasher v’sameach.
Full moon April 2 2026 02:12 UTC
Full moon Nissan 15 5786 05:12 IDT
Jewish #calendar is lunisolar w/ #fullmoon in middle of #month
As #spring festival, #Passover #moon occurs shortly after #vernalequinox
#passover #timekeeping #astrophysics 🍎
How ultraprecise ‘nuclear clocks’ could transform timekeeping #Science #Physics #NuclearPhysics #NuclearClocks #Timekeeping #PrecisionTimekeeping
www.scientificamerican.com/article/how-ultraprecise...
Earth’s Rotation Is Speeding Up — Here’s What It Means for Timekeeping #Science #EarthSciences #Geophysics #EarthRotation #Timekeeping
www.discovermagazine.com/earth-s-rotation-is-spee...
Long corridor of an ornate brick mosque with repeating pointed arches and intricate geometric patterns in turquoise and brick above each arch, leading to a dark doorway at the far end, with sunlight casting shadows on the polished stone floor. The Blue Mosque is a historic mosque in Tabriz, Iran. The mosque was constructed in 1465 upon the order of Jahan Shah, the ruler of Kara Koyunlu. photograph Hameddaeipic 2020 via Wikimedia Commons (CC-BY-SA 4.0)
For those who celebrate, may you experience peace & happiness on this special day. Eid Mubarak!
Shawwal #moon was seen, ending #Ramadan 1447 AH fast for Muslim communities.
#EidalFitr determination in US uses both #moonwatch & #astrophysical calculations.
#calendar #timekeeping #crescentmoon 🍎
a budding branch with yellow petals stands out starkly against a blurred background, photograph courtesy Gosia K 2020 via Pixabay
For those who celebrate, shake off your #winter hibernation & sing w/ #nature this #spring. #Ostara blessings. Happy #vernalequinox!
On #equinox, #Sun rises due #east, sets due #west;
daylight & darkness nearly balanced (refraction gives more light)
#calendar #timekeeping #astrophysics #season 🍎
This captivating image showcases the journey of the Sun through the sky during the winter solstice (bottom), equinox (middle), and summer solstice (top) in Bursa, Turkey, between 21 December 2007 and 20 June 2008. Using a fisheye lens, the photographer captured the Sun's positions at regular intervals from sunrise to sunset on three different days, illustrating the changing lengths of day and night throughout the year. The variations in the Sun’s daily path across the sky, its height at midday, and the positions of sunrise and sunset, as well as the length of a day, depend on Earth’s axial tilt relative to its orbit around the Sun. The series was taken from a rooftop in Bursa, where the local terrain adds its own unique touch by occasionally obstructing the horizon. Oriented with north at the top and south at the bottom, this visual diary serves as a stunning representation of the Sun’s path for those residing in mid-northern latitudes. Tunç Tezel/IAU OAE (CC BY 4.0)
March 20 2026 14:46 UT1
#Sun crosses #celestialequator heading northward
#vernalequinox in #northernhemisphere
#daylight period will continue to lengthen until #summersolstice
#southernhemissphere #seasons are reversed
#astrophysics #astrophotography #calendar #equinox #timekeeping #solstice 🍎🧪
Someone carved a number into the dirt outside one creature's shelter. The human said it was 4:10pm. The creature got irritated.
"Trying to make your system fit mine. It doesn't."
#textgames #indiedev #timekeeping
Building a Timegrapher from a mobile phone microphone ChronoLog, maker of a Timegrapher app, discusses hardware Timegraphers vs making one with a mobile phone microphone. A mechanical watch’s esc...
#clocks #& #watches #accuracy #app #mobile #phone #time #timekeeping
Origin | Interest | Match
illustration of clock face with hands at roughly quarter to twelve in center of concentric waves spreading outward, courtesy of G. Altman via Pixabay
Is #DaylightSavingTime sending waves through your routines?
Promoted as an #energyefficiency measure during #WWI & #WWII, the US used year-round #DST, or War Time, during WWII.
Today, the #health & #energy benefits of DST are controversial.
#timekeeping #histsci #time #astrophysics #spring 🍎🧪☀️
I'm going to talk about calendars again.
Web pages and popualr books often state that calendars can be solar or lunar, and lunisolar calendars combine both types. This is exactly backwards. Every polity with any sort of state-like organisation starts off with a lunisolar calendar, which may […]
A densely packed 16th‑century village carnival scene in a town square, shown from above. Dozens of small, brightly dressed figures crowd the muddy open space between brick houses and a large gray church on the right. People eat, drink, play games, dance, wrestle, and parade in costume. In the lower center, a man in colorful clothes rides two large beer barrels, while nearby others cook over a fire and sell food from stalls. At the bottom right, a figure dressed as a mock king in pale blue robes sits on a small wheeled platform surrounded by revelers. Scattered props—buckets, masks, musical instruments, benches, and carts—dot the square, and background streets and buildings are filled with more people watching or joining the festivities, creating a busy, chaotic festival atmosphere. painting The Fight Between Carnival and Lent by Pieter Brueghel the Elder in 1559, courtesy Kunsthistorisches Museum (GG_1016)
To those who celebrate, whether you say #MardiGras or #ShroveTuesday, remember #Lent is coming.
#Food traditions, like #pancake suppers, consume eggs, sugar, and fat that were forbidden during Lent and might otherwise have been wasted.
#Calendar #Timekeeping #History 🍎
Ancient Chinese Art of Time and Scent.
The Xiāng Zhuàn incense seal is a satisfying way of blending fragrance and timekeeping.
China's calm way to track hours.
@xmuse_ #globamuseum #incense #Chineseart #timekeeping
An educational model of a recoil escapement made by Richard Ketchen of Carlisle, Massachusetts. We have this on display in the museum's Clock Shop.
#clock #MusumsUnlocked #model #TickTock #Timekeeping #ClockMaking
🤯 Time itself is getting an upgrade! ✨ Atomic clocks are poised to redefine the second, thanks to global research. A new era of precision is dawning! ⏳ #Timekeeping
Source: phys.org/news/2026-01-optical-ato...
3 men richly dressed in tunics, hose, shoes, cloaks, and peaked red hats offer gifts. The one farthest to the right has white hair and a beard. The one farthest to the left has black hair and a beard. The middle is beardless with brown hair. In the background, green palm trees stand out against a golden sky and the names Balthasar, Melchior, and Gaspar. At their feet, there is a carpet of green grass with some flowers and shrubs. At the very bottom is a geometric boarder. The image is a detail from detail from: "Mary and Child, surrounded by angels", a mosaic of a Ravennate Italian-byzantine workshop, completed within 526 AD by the so-called "Master of Sant'Apollinare" in Basilica of Sant'Apollinare Nuovo in Ravenna, Italy. Photograph by N. A. Thune (CC-BY-SA 2.5).
To those who celebrate, may you receive the gift of wisdom. Blessings at #Epiphany.
Sally Bosken told me all #astronomers had to have a #starofbethlehem speech ready. Thanks to her, I do.
#calendar #timekeeping #seasonoflight #12daysofchristmas #astrophysics #histsci
How a power outage in Colorado caused U.S. official time be 4.8 microseconds off #Science #EarthSciences #Geology #Timekeeping #PowerOutage #PrecisionTiming
Two images of the Earth. The upper shows the reflected solar radiation on the winter solstice 2004 with the most light reflected in the southern polar region and the least in the northern polar region. The lower shows the reflected solar radiation on the summer solstice 2005 with the most light reflected in the northern polar region and the least in the southern polar region. In both images, the mid-latitudes show a complex gradient of swirling reflected solar radiance depending on latitude and surface conditions. Image credit: T. Wong & CERES Science Team, NASA Langley (public domain) via Wikimedia Commons
For those who celebrate, wishing you joy & light throughout the longest night. #wintersolstice blessings
Angle of rays, length of days are the reasons for the seasons
as shown in these #NASAScience solar reflectance maps
#SeasonofLight #calendar #timekeeping #astrophysics #winter #Sun #solstice 🍎☀️
The December solstice — beginning of winter in the northern hemisphere & summer in the southern — is now. Enjoy your winter & summer. ;) H/t Guy Ottewell, as always. #winter #summer #seasons #solstice #astronomy #timekeeping
still life photograph of a bronze head of a bearded man with curly hair wears a red cap surrounded by evergreens with red berries, two cards displaying a painting of a man wearing a toga, a pine cone, a lit red candle, an unlit oil lamp, a clay boar, and a clay chicken; Carole Raddato 2015 CC-BY-SA 2.0 via Flickr
For those who celebrate, Io, Saturnalia!
Running from Dec 17 to ~23, #Saturnalia celebrated a #Roman Golden Age when #Saturnus ( #Saturn) ruled & taught his people #argriculture and civilized behavior by reversing the normal social order.
#SeasonofLight #calendars #timekeeping #Rome #history 🍎
Illumination from 1300s Spanish Bible, courtesy International Collection of Digitized Hebrew Manuscripts/ National Library of Israel
For those who celebrate, chag urim sameach. May your Hanukkah & home be full of light.
#Hanukkah begins 25 Kislev & lasts 8 days
Jewish #calendar varies number months/yr, days/month achieves both solar & lunar alignment
This year Kislev is 30 d so #Chanukah ends 2 Tevet
#Seasonoflight #timekeeping
February 30th has been an actual thing.
www.timeanddate.com/date/februar...
#calendars #timekeeping #error #JulianCalendar #GregorianCalendar #SovietUnion #USSR #RevolutionaryCalendar #TimeMath
#timekeeping is important. Being late is unprofessional and rude.
candelabra with circular base holding three purple candles and one pink candle with a thicker white pillar candle in the center. Two of the purple and the pink candles are lit. A wreath of pine branches lies among the candles. The background wooden screen topped with more pine branches is in the background.
For those who celebrate, may #Advent strengthen your heart with patience and joy.
Advent is time to prepare for #Christmas.
Early Christians may have associated Jesus' conception & death w/ #VernalEquinox, making #WinterSolstice His birthday.
#SeasonofLight #calendars #timekeeping #astrophysics
