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#timekeeping

1 Beitrag1 Beteiligte*r0 Beiträge heute
Hacker News<p>NIST Ion Clock Sets New Record for Most Accurate Clock in the World</p><p><a href="https://www.nist.gov/news-events/news/2025/07/nist-ion-clock-sets-new-record-most-accurate-clock-world" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">nist.gov/news-events/news/2025</span><span class="invisible">/07/nist-ion-clock-sets-new-record-most-accurate-clock-world</span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/NIST" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NIST</span></a> <a href="https://mastodon.social/tags/Ion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ion</span></a> <a href="https://mastodon.social/tags/Clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Clock</span></a> <a href="https://mastodon.social/tags/Accurate" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Accurate</span></a> <a href="https://mastodon.social/tags/Clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Clock</span></a> <a href="https://mastodon.social/tags/World" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>World</span></a> <a href="https://mastodon.social/tags/Technology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Technology</span></a> <a href="https://mastodon.social/tags/Innovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Innovation</span></a> <a href="https://mastodon.social/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Timekeeping</span></a></p>
Jennifer Lynn Bartlett<p>For those who celebrate, may you draw strength and vitality from the summer solstice.</p><p>Sun reaches max declination Jun 21 2025 at 02:42 UT1 (Jun 20 22:42 US EDT)</p><p>photograph courtesy of Hans via Pixabay<br><a href="https://astrodon.social/tags/summersolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>summersolstice</span></a> <a href="https://astrodon.social/tags/summer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>summer</span></a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>solstice</span></a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendar</span></a> <a href="https://astrodon.social/tags/season" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>season</span></a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a> <a href="https://astrodon.social/tags/Sun" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sun</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a></p>
Jennifer Lynn Bartlett<p>Solstice from Latin sōlstitium via old French </p><p>sōl (sun) + participial stem of sistĕre = stand still</p><p>according to OED</p><p>photograph of University of Massachusetts at Amherst Sunwheel during a summer solstice; courtesy of UMass Amherst<br><a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/solstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>solstice</span></a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>histsci</span></a> <a href="https://astrodon.social/tags/OED" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OED</span></a> <a href="https://astrodon.social/tags/etymology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>etymology</span></a> <a href="https://astrodon.social/tags/season" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>season</span></a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendar</span></a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a> <a href="https://astrodon.social/tags/summer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>summer</span></a> <a href="https://astrodon.social/tags/SummerSolstice" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SummerSolstice</span></a> <a href="https://astrodon.social/tags/Sun" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Sun</span></a> <a href="https://astrodon.social/tags/Latin" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Latin</span></a> <a href="https://astrodon.social/tags/French" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>French</span></a> <a href="https://astrodon.social/tags/English" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>English</span></a></p>
Joe Vilas<p>June solstice was at 02:40 UT (22:40 EDT); it's summer in the Northern Hemisphere &amp; 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">#<span>solstice</span></a> <a href="https://triangletoot.party/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://triangletoot.party/tags/calendars" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendars</span></a> <a href="https://triangletoot.party/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a></p>
Hacker News<p>Precision Clock Mk IV</p><p><a href="https://mitxela.com/projects/precision_clock_mk_iv" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">mitxela.com/projects/precision</span><span class="invisible">_clock_mk_iv</span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/PrecisionClock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PrecisionClock</span></a> <a href="https://mastodon.social/tags/MkIV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MkIV</span></a> <a href="https://mastodon.social/tags/MITxela" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MITxela</span></a> <a href="https://mastodon.social/tags/Technology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Technology</span></a> <a href="https://mastodon.social/tags/Innovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Innovation</span></a> <a href="https://mastodon.social/tags/Timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Timekeeping</span></a></p>
Hacker News<p>New atomic fountain clock joins group that keeps the world on time</p><p><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"><span class="invisible">https://www.</span><span class="ellipsis">nist.gov/news-events/news/2025</span><span class="invisible">/04/new-atomic-fountain-clock-joins-elite-group-keeps-world-time</span></a></p><p><a href="https://mastodon.social/tags/HackerNews" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HackerNews</span></a> <a href="https://mastodon.social/tags/atomicfountainclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>atomicfountainclock</span></a> <a href="https://mastodon.social/tags/worldtime" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>worldtime</span></a> <a href="https://mastodon.social/tags/precisionclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>precisionclock</span></a> <a href="https://mastodon.social/tags/technologyinnovation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>technologyinnovation</span></a> <a href="https://mastodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a></p>
Jennifer Lynn Bartlett<p>For 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">#<span>spring</span></a> this <a href="https://astrodon.social/tags/vernalequinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>vernalequinox</span></a>.</p><p>Consider our <a href="https://astrodon.social/tags/seasons" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>seasons</span></a> with <a href="https://astrodon.social/tags/Earth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Earth</span></a> tilted ~23.4 deg, imagine seasons on <a href="https://astrodon.social/tags/Uranus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Uranus</span></a> tilted ~82.2 deg. </p><p><a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/planet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>planet</span></a> <a href="https://astrodon.social/tags/equinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>equinox</span></a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendar</span></a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a><br>image by L. Sromovsky (U WI Madison) &amp; Keck via APOD 2004</p>
Jennifer Lynn Bartlett<p>Still adjusting to <a href="https://astrodon.social/tags/DaylightSavingTime" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DaylightSavingTime</span></a>?</p><p>During <a href="https://astrodon.social/tags/WWII" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>WWII</span></a>, UK used double summer time. Springing forward 2 hours (UTC+2), but only falling back 1 hour (UTC+1+. </p><p>Economic &amp; health effects of <a href="https://astrodon.social/tags/DST" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DST</span></a> remain controversial.</p><p><a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a> <a href="https://astrodon.social/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>histsci</span></a> <br>illustration courtesy geralt via Pixabay</p>
STREET ART UTOPIA<p><strong>Busy day at Stonehenge as the stones are moved forward one hour</strong></p> 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 […] <p><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"><span class="invisible">https://</span><span class="ellipsis">streetartutopia.com/2025/03/09</span><span class="invisible">/busy-day-at-stonehenge-as-the-stones-are-moved-forward-one-hour/</span></a></p>
Jennifer Lynn Bartlett<p>For those who celebrate, laissez les bons temps rouler. <a href="https://astrodon.social/tags/Lent" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Lent</span></a> is coming </p><p><a href="https://astrodon.social/tags/MardiGras" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MardiGras</span></a> &amp; <a href="https://astrodon.social/tags/AshWednesday" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>AshWednesday</span></a> are 41/40 days before <a href="https://astrodon.social/tags/Easter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Easter</span></a> (exclude Sundays), as determined by <a href="https://astrodon.social/tags/fullmoon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fullmoon</span></a> after <a href="https://astrodon.social/tags/vernalequinox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>vernalequinox</span></a> </p><p>Computes paschalis: calculates these dates.</p><p><a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a> <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendar</span></a> <a href="https://astrodon.social/tags/histsci" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>histsci</span></a> <br>Mempi Carnival invitation cover, Memphis Tennessee (public domain) via Wikimedia Commons</p>
Jennifer Lynn Bartlett<p>For those who celebrate, may discipline &amp; devotion during this holy month bring peace &amp; blessings. Ramadan Mubarak! </p><p><a href="https://astrodon.social/tags/Ramadan" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ramadan</span></a> begins w/ 1st sighting of waxing crescent <a href="https://astrodon.social/tags/moon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>moon</span></a>. Purely lunar Islamic <a href="https://astrodon.social/tags/calendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calendar</span></a> shifts w/ respect to civil (lunisolar) calendar &amp; <a href="https://astrodon.social/tags/seasons" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>seasons</span></a>.</p><p><a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/timekeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>timekeeping</span></a> <br>photograph of Fatima Masumeh Shrine, Qom, Iran by A. Pashaei (CC BY-SA 4.0) in 2020 via Wikimedia Commons</p>
Michael Gisiger :mastodon:<p>It's learning time!</p><p>Today: sun and star dials</p><p><a href="https://www.youtube.com/watch?v=ViaxtzwXBMc" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=ViaxtzwXBM</span><span class="invisible">c</span></a></p><p><a href="https://nerdculture.de/tags/TimeKeeping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TimeKeeping</span></a> <a href="https://nerdculture.de/tags/horology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>horology</span></a> <a href="https://nerdculture.de/tags/sundial" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sundial</span></a> <a href="https://nerdculture.de/tags/TIL" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TIL</span></a></p>
Fortgeführter Thread
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/?

#Months#Moon#Timekeeping
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