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Jennifer Lynn BartlettFor those who celebrate, may you draw strength and vitality from the summer solstice.Sun reaches max declination Jun 21 2025 at 02:42 UT1 (Jun 20 22:42 US EDT)photograph courtesy of Hans via Pixabay <a href="https://astrodon.social/tags/summersolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#summersolstice</a> <a href="https://astrodon.social/tags/summer" class="mention hashtag" rel="nofollow noopener" target="_blank">#summer</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/season" class="mention hashtag" rel="nofollow noopener" target="_blank">#season</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/Sun" class="mention hashtag" rel="nofollow noopener" target="_blank">#Sun</a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a>

Jennifer Lynn BartlettSolstice from Latin sōlstitium via old French sōl (sun) + participial stem of sistĕre = stand stillaccording to OEDphotograph of University of Massachusetts at Amherst Sunwheel during a summer solstice; courtesy of UMass Amherst <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#histsci</a> <a href="https://astrodon.social/tags/OED" class="mention hashtag" rel="nofollow noopener" target="_blank">#OED</a> <a href="https://astrodon.social/tags/etymology" class="mention hashtag" rel="nofollow noopener" target="_blank">#etymology</a> <a href="https://astrodon.social/tags/season" class="mention hashtag" rel="nofollow noopener" target="_blank">#season</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/summer" class="mention hashtag" rel="nofollow noopener" target="_blank">#summer</a> <a href="https://astrodon.social/tags/SummerSolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#SummerSolstice</a> <a href="https://astrodon.social/tags/Sun" class="mention hashtag" rel="nofollow noopener" target="_blank">#Sun</a> <a href="https://astrodon.social/tags/Latin" class="mention hashtag" rel="nofollow noopener" target="_blank">#Latin</a> <a href="https://astrodon.social/tags/French" class="mention hashtag" rel="nofollow noopener" target="_blank">#French</a> <a href="https://astrodon.social/tags/English" class="mention hashtag" rel="nofollow noopener" target="_blank">#English</a>

Joe VilasJune solstice was at 02:40 UT (22:40 EDT); it's summer in the Northern Hemisphere & winter in the Southern. Hope everyone has a great season; also hope most of us in the U.S. (or really anywhere) don't melt over the next week, or maybe even all summer. <a href="https://triangletoot.party/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a> <a href="https://triangletoot.party/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://triangletoot.party/tags/calendars" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendars</a> <a href="https://triangletoot.party/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a>

Hacker NewsPrecision Clock Mk IV<a href="https://mitxela.com/projects/precision_clock_mk_iv" rel="nofollow noopener" translate="no" target="_blank">https://mitxela.com/projects/precision_clock_mk_iv</a><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#HackerNews</a> <a href="https://mastodon.social/tags/PrecisionClock" class="mention hashtag" rel="nofollow noopener" target="_blank">#PrecisionClock</a> <a href="https://mastodon.social/tags/MkIV" class="mention hashtag" rel="nofollow noopener" target="_blank">#MkIV</a> <a href="https://mastodon.social/tags/MITxela" class="mention hashtag" rel="nofollow noopener" target="_blank">#MITxela</a> <a href="https://mastodon.social/tags/Technology" class="mention hashtag" rel="nofollow noopener" target="_blank">#Technology</a> <a href="https://mastodon.social/tags/Innovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#Innovation</a> <a href="https://mastodon.social/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#Timekeeping</a>

Hacker NewsNew atomic fountain clock joins group that keeps the world on time<a href="https://www.nist.gov/news-events/news/2025/04/new-atomic-fountain-clock-joins-elite-group-keeps-world-time" rel="nofollow noopener" translate="no" target="_blank">https://www.nist.gov/news-events/news/2025/04/new-atomic-fountain-clock-joins-elite-group-keeps-world-time</a><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#HackerNews</a> <a href="https://mastodon.social/tags/atomicfountainclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#atomicfountainclock</a> <a href="https://mastodon.social/tags/worldtime" class="mention hashtag" rel="nofollow noopener" target="_blank">#worldtime</a> <a href="https://mastodon.social/tags/precisionclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#precisionclock</a> <a href="https://mastodon.social/tags/technologyinnovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#technologyinnovation</a> <a href="https://mastodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a>

Jennifer Lynn BartlettFor those who celebrate, may your heart join nature in singing the joy of <a href="https://astrodon.social/tags/spring" class="mention hashtag" rel="nofollow noopener" target="_blank">#spring</a> this <a href="https://astrodon.social/tags/vernalequinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#vernalequinox</a>.Consider our <a href="https://astrodon.social/tags/seasons" class="mention hashtag" rel="nofollow noopener" target="_blank">#seasons</a> with <a href="https://astrodon.social/tags/Earth" class="mention hashtag" rel="nofollow noopener" target="_blank">#Earth</a> tilted ~23.4 deg, imagine seasons on <a href="https://astrodon.social/tags/Uranus" class="mention hashtag" rel="nofollow noopener" target="_blank">#Uranus</a> tilted ~82.2 deg. <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/planet" class="mention hashtag" rel="nofollow noopener" target="_blank">#planet</a> <a href="https://astrodon.social/tags/equinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#equinox</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> image by L. Sromovsky (U WI Madison) & Keck via APOD 2004

Jennifer Lynn BartlettStill adjusting to <a href="https://astrodon.social/tags/DaylightSavingTime" class="mention hashtag" rel="nofollow noopener" target="_blank">#DaylightSavingTime</a>?During <a href="https://astrodon.social/tags/WWII" class="mention hashtag" rel="nofollow noopener" target="_blank">#WWII</a>, UK used double summer time. Springing forward 2 hours (UTC+2), but only falling back 1 hour (UTC+1+. Economic & health effects of <a href="https://astrodon.social/tags/DST" class="mention hashtag" rel="nofollow noopener" target="_blank">#DST</a> remain controversial.<a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#time</a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#histsci</a> illustration courtesy geralt via Pixabay

STREET ART UTOPIABusy day at Stonehenge as the stones are moved forward one hour Stonehenge is one of the world's most iconic prehistoric monuments, but did you know that parts of it have been moved in modern times? This fascinating image shows a moment from the 1950s restoration efforts, but with a humorous twist—it almost looks like the stones are being adjusted for daylight saving time! Of course, no one is actually resetting Stonehenge for daylight saving time—but this real historical photo from the 1950s restoration efforts makes it look that way! The Real […] <a href="https://streetartutopia.com/2025/03/09/busy-day-at-stonehenge-as-the-stones-are-moved-forward-one-hour/" rel="nofollow noopener" translate="no" target="_blank">https://streetartutopia.com/2025/03/09/busy-day-at-stonehenge-as-the-stones-are-moved-forward-one-hour/</a>

Jennifer Lynn BartlettFor those who celebrate, laissez les bons temps rouler. <a href="https://astrodon.social/tags/Lent" class="mention hashtag" rel="nofollow noopener" target="_blank">#Lent</a> is coming <a href="https://astrodon.social/tags/MardiGras" class="mention hashtag" rel="nofollow noopener" target="_blank">#MardiGras</a> & <a href="https://astrodon.social/tags/AshWednesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#AshWednesday</a> are 41/40 days before <a href="https://astrodon.social/tags/Easter" class="mention hashtag" rel="nofollow noopener" target="_blank">#Easter</a> (exclude Sundays), as determined by <a href="https://astrodon.social/tags/fullmoon" class="mention hashtag" rel="nofollow noopener" target="_blank">#fullmoon</a> after <a href="https://astrodon.social/tags/vernalequinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#vernalequinox</a> Computes paschalis: calculates these dates.<a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#histsci</a> Mempi Carnival invitation cover, Memphis Tennessee (public domain) via Wikimedia Commons

Jennifer Lynn BartlettFor those who celebrate, may discipline & devotion during this holy month bring peace & blessings. Ramadan Mubarak! <a href="https://astrodon.social/tags/Ramadan" class="mention hashtag" rel="nofollow noopener" target="_blank">#Ramadan</a> begins w/ 1st sighting of waxing crescent <a href="https://astrodon.social/tags/moon" class="mention hashtag" rel="nofollow noopener" target="_blank">#moon</a>. Purely lunar Islamic <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> shifts w/ respect to civil (lunisolar) calendar & <a href="https://astrodon.social/tags/seasons" class="mention hashtag" rel="nofollow noopener" target="_blank">#seasons</a>.<a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> photograph of Fatima Masumeh Shrine, Qom, Iran by A. Pashaei (CC BY-SA 4.0) in 2020 via Wikimedia Commons

Michael Gisiger :mastodon:It's learning time!Today: sun and star dials<a href="https://www.youtube.com/watch?v=ViaxtzwXBMc" rel="nofollow noopener" translate="no" target="_blank">https://www.youtube.com/watch?v=ViaxtzwXBMc</a><a href="https://nerdculture.de/tags/TimeKeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#TimeKeeping</a> <a href="https://nerdculture.de/tags/horology" class="mention hashtag" rel="nofollow noopener" target="_blank">#horology</a> <a href="https://nerdculture.de/tags/sundial" class="mention hashtag" rel="nofollow noopener" target="_blank">#sundial</a> <a href="https://nerdculture.de/tags/TIL" class="mention hashtag" rel="nofollow noopener" target="_blank">#TIL</a>

Infrapink (he/his/him)The issue here is that 28 days doesn't match up with any lunar cycles. The synodic month is a shade over 29½ days long, so any timekeeping system that synchronises with the phases of the moon will have months of 29 or 30 days.The sidereal and draconic months are just over 27 days long; months that synchronise with those moon cycles will occasionally be 28 days long, but will more often have 27 days.3/?<a href="https://mastodon.ie/tags/Months" class="mention hashtag" rel="nofollow noopener" target="_blank">#Months</a> <a href="https://mastodon.ie/tags/Moon" class="mention hashtag" rel="nofollow noopener" target="_blank">#Moon</a> <a href="https://mastodon.ie/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#Timekeeping</a> <a href="https://mastodon.ie/tags/Calendars" class="mention hashtag" rel="nofollow noopener" target="_blank">#Calendars</a>

LavX NewsHow a Leap Second Became a Leap of Faith in Tech TimekeepingIn the world of precise timekeeping, leap seconds can cause chaos. Discover how one sysadmin ingeniously managed to slow down an entire company's infrastructure by a second to avoid the pitfalls of a ...<a href="https://news.lavx.hu/article/how-a-leap-second-became-a-leap-of-faith-in-tech-timekeeping" rel="nofollow noopener" translate="no" target="_blank">https://news.lavx.hu/article/how-a-leap-second-became-a-leap-of-faith-in-tech-timekeeping</a><a href="https://mastodon.social/tags/news" class="mention hashtag" rel="nofollow noopener" target="_blank">#news</a> <a href="https://mastodon.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#tech</a> <a href="https://mastodon.social/tags/LeapSecond" class="mention hashtag" rel="nofollow noopener" target="_blank">#LeapSecond</a> <a href="https://mastodon.social/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#NTP</a> <a href="https://mastodon.social/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#Timekeeping</a>

Jennifer Lynn BartlettFor those who celebrate, Habari gani? Ujima (collective work & responsibility). Happy <a href="https://astrodon.social/tags/Kwanzaa" class="mention hashtag" rel="nofollow noopener" target="_blank">#Kwanzaa</a>!Running from Dec. 26-Jan. 1, festival draws on African 1st fruits celebrations. <a href="https://astrodon.social/tags/Seasons" class="mention hashtag" rel="nofollow noopener" target="_blank">#Seasons</a> are reversed in northern/southern hemispheres, so <a href="https://astrodon.social/tags/wintersolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#wintersolstice</a> (north) is <a href="https://astrodon.social/tags/summersolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#summersolstice</a> (south).<a href="https://astrodon.social/tags/seasonoflight" class="mention hashtag" rel="nofollow noopener" target="_blank">#seasonoflight</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> US postage stamp

Jennifer Lynn BartlettFor those who celebrate, may your <a href="https://astrodon.social/tags/Advent" class="mention hashtag" rel="nofollow noopener" target="_blank">#Advent</a> be a meaningful journey to <a href="https://astrodon.social/tags/Christmas" class="mention hashtag" rel="nofollow noopener" target="_blank">#Christmas</a>.Advent is the 4 weeks preceding Christmas, which occurs on Dec. 25, the nominal <a href="https://astrodon.social/tags/wintersolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#wintersolstice</a> date during the <a href="https://astrodon.social/tags/RomanEmpire" class="mention hashtag" rel="nofollow noopener" target="_blank">#RomanEmpire</a>. <a href="https://astrodon.social/tags/calander" class="mention hashtag" rel="nofollow noopener" target="_blank">#calander</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/seasonoflight" class="mention hashtag" rel="nofollow noopener" target="_blank">#seasonoflight</a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#histsci</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a> <a href="https://astrodon.social/tags/winter" class="mention hashtag" rel="nofollow noopener" target="_blank">#winter</a> <a href="https://astrodon.social/tags/Rome" class="mention hashtag" rel="nofollow noopener" target="_blank">#Rome</a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a>

IT NewsA Cyberpunk Pocketwatch - For a time, pocketwatches were all the rage, but they were eventually supplanted b... - <a href="https://hackaday.com/2024/11/20/a-cyberpunk-pocketwatch/" rel="nofollow noopener" translate="no" target="_blank">https://hackaday.com/2024/11/20/a-cyberpunk-pocketwatch/</a> <a href="https://schleuss.online/tags/pocketwatch" class="mention hashtag" rel="nofollow noopener" target="_blank">#pocketwatch</a> <a href="https://schleuss.online/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#clockhacks</a> <a href="https://schleuss.online/tags/locknwatch" class="mention hashtag" rel="nofollow noopener" target="_blank">#locknwatch</a> <a href="https://schleuss.online/tags/cyberpunk" class="mention hashtag" rel="nofollow noopener" target="_blank">#cyberpunk</a> <a href="https://schleuss.online/tags/horology" class="mention hashtag" rel="nofollow noopener" target="_blank">#horology</a> <a href="https://schleuss.online/tags/watch" class="mention hashtag" rel="nofollow noopener" target="_blank">#watch</a>

Jennifer Lynn BartlettFor those who celebrate, may your <a href="https://astrodon.social/tags/Diwali" class="mention hashtag" rel="nofollow noopener" target="_blank">#Diwali</a> be full of <a href="https://astrodon.social/tags/light" class="mention hashtag" rel="nofollow noopener" target="_blank">#light</a> and joy.<a href="https://astrodon.social/tags/newmoon" class="mention hashtag" rel="nofollow noopener" target="_blank">#newmoon</a> was 8:47 AM US EDT today. Diwali occurs at new <a href="https://astrodon.social/tags/moon" class="mention hashtag" rel="nofollow noopener" target="_blank">#moon</a>, the darkest night, in the middle of the <a href="https://astrodon.social/tags/lunar" class="mention hashtag" rel="nofollow noopener" target="_blank">#lunar</a> <a href="https://astrodon.social/tags/month" class="mention hashtag" rel="nofollow noopener" target="_blank">#month</a> of Kārtika.<a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> photograph courtesy of anon via Pixabay

Jennifer Lynn BartlettTo those who celebrate, happy <a href="https://astrodon.social/tags/Halloween" class="mention hashtag" rel="nofollow noopener" target="_blank">#Halloween</a>.Halloween, or <a href="https://astrodon.social/tags/AllHallowsEve" class="mention hashtag" rel="nofollow noopener" target="_blank">#AllHallowsEve</a>, has its origins in the ancient Celtic festival of <a href="https://astrodon.social/tags/Samhain" class="mention hashtag" rel="nofollow noopener" target="_blank">#Samhain</a>, which falls halfway between the <a href="https://astrodon.social/tags/autumn" class="mention hashtag" rel="nofollow noopener" target="_blank">#autumn</a> <a href="https://astrodon.social/tags/equinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#equinox</a> and <a href="https://astrodon.social/tags/winter" class="mention hashtag" rel="nofollow noopener" target="_blank">#winter</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a>.<a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> image credit T.A. Rector/Univ. AK-Anchorage, H. Schweiker/WIYN & NOIRLab/NSF/AURA (CC BY 4.0)

Jennifer Lynn BartlettTo those who celebrate <a href="https://astrodon.social/tags/Samhain" class="mention hashtag" rel="nofollow noopener" target="_blank">#Samhain</a>, may the old pass away and the new begin.A <a href="https://astrodon.social/tags/cross" class="mention hashtag" rel="nofollow noopener" target="_blank">#cross</a>-quarter day between the <a href="https://astrodon.social/tags/autumn" class="mention hashtag" rel="nofollow noopener" target="_blank">#autumn</a> <a href="https://astrodon.social/tags/equinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#equinox</a> & the <a href="https://astrodon.social/tags/winter" class="mention hashtag" rel="nofollow noopener" target="_blank">#winter</a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#solstice</a>, Samhain marks a transition as the hours of darkness increase and the weather grows colder.<a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#timekeeping</a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#calendar</a> <a href="https://astrodon.social/tags/halloween" class="mention hashtag" rel="nofollow noopener" target="_blank">#halloween</a> artwork courtesy Jolene Simon via Pixabay

Michael Gisiger :mastodon:The Greatest Horological Inventions of All Time, Part 1: the <a href="https://nerdculture.de/tags/Pendulum" class="mention hashtag" rel="nofollow noopener" target="_blank">#Pendulum</a> <a href="https://nerdculture.de/tags/Clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#Clock</a> and Improving the Accuracy of <a href="https://nerdculture.de/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#Timekeeping</a> <a href="https://wornandwound.com/the-greatest-horological-inventions-of-all-time-the-pendulum-clock-and-improving-the-accuracy-of-timekeeping/" rel="nofollow noopener" translate="no" target="_blank">https://wornandwound.com/the-greatest-horological-inventions-of-all-time-the-pendulum-clock-and-improving-the-accuracy-of-timekeeping/</a><a href="https://nerdculture.de/tags/horology" class="mention hashtag" rel="nofollow noopener" target="_blank">#horology</a> <a href="https://nerdculture.de/tags/watchmaking" class="mention hashtag" rel="nofollow noopener" target="_blank">#watchmaking</a>

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