# Second

The second (symbol: s, also abbreviated: sec) is the base unit of time in the International System of Units (SI) (French: Système International d’unités), commonly understood and historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). Analog clocks and watches often have sixty tick marks on their faces, representing seconds (and minutes), and a "second hand" to mark the passage of time in seconds. Digital clocks and watches often have a two-digit seconds counter. The second is also part of several other units of measurement like meters per second for speed, meters per second per second for acceleration, and cycles per second for frequency.

Although the historical definition of the unit was based on this division of the Earth's rotation cycle, the formal definition in the International System of Units (SI) is a much steadier timekeeper:The second is equal to the duration of 9192631770 periods of the radiation corresponding to the transition between the hyperfine levels of the unperturbed ground state of the 133Cs atom.

Because the Earth's rotation varies and is also slowing very slightly, a leap second is added at irregular intervals to clock time to keep clocks in sync with Earth's rotation.

Multiples of seconds are usually counted in hours and minutes. Fractions of a second are usually counted in tenths or hundredths. In scientific work, small fractions of a second are counted in milliseconds (thousandths), microseconds (millionths), nanoseconds (billionths), and sometimes smaller units of a second. An everyday experience with small fractions of a second is a 1-gigahertz microprocessor which has a cycle time of 1 nanosecond. Camera shutter speeds are often expressed in fractions of a second, such as 1⁄30 second or 1⁄1000 second.

Sexagesimal divisions of the day from a calendar based on astronomical observation have existed since the third millennium BC, though they were not seconds as we know them today. Small divisions of time could not be measured back then, so such divisions were mathematically derived. The first timekeepers that could count seconds accurately were pendulum clocks invented in the 17th century. Starting in the 1950s, atomic clocks became better timekeepers than Earth's rotation, and they continue to set the standard today.

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May 19, 2022

# Aquakultre Shares “Lunch,” the Second Track From New Album ‘Don’t Trip'

Halifax artist Aquakultre has shared "Lunch," a song he wrote with his partner Joolsannie. The track is from his upcoming record 'Don't Trip,' out July 22.

www.complex.com

May 16, 2022

# Miley Cyrus to Host NBC’s New Year’s Eve Special for a Second Year

'SNL' creator Lorne Michaels will also return as this year's executive producer.

www.billboard.com

May 16, 2022

# Billionaire Boys Club x Reebok Join Forces for Second 'Zig Kinetica II' Sneaker

Following up on an initial Zig collaboration that launched in 2019, BBC and Reebok are back together, teaming for a second interpretation of the Zig Kinetica II

www.complex.com

May 16, 2022

# Diddy Opens Up the 2022 Billboard Music Awards With Love & Positivity: ‘We Got a Second Chance at Life’

Diddy opens up 2022 Billboard Music Awards with a performance and stirring monologue.

www.billboard.com

May 13, 2022

# ‘Paulo Londra: Bzrp Music Sessions, Vol. 23’ Rules Billboard Argentina Hot 100 For a Second Week

Plus, Bad Bunny’s “Moscow Mule” debuts at No. 43.

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May 11, 2022

# French Skate Label Hélas Unveils Second Spring 2022 Drop

Showcased by the brand’s usual array of suspects, Isaiejah Woldemedin, Timo Moffen,Ilan Kraiem Zeitoun, colour-blocked hoodies and tracksuits take centre stage.

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May 9, 2022

# Gabby Barrett Expecting Second Child With Cade Foehner

The news came on Mother's Day.

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May 8, 2022

# CASETiFY Reunite with Basquiat for Second Collab Collection

CASETiFY and Basquiat’s best-selling collaboration is back, with an all-new range of tech accessories inspired by the iconic artworks of the late artist.

www.complex.com

May 4, 2022

# Ray J Claims Second Kim K Sex Tape Is Real, Says Kris Orchestrated First Tape’s Sale, and Shares Alleged DMs

Ray J has seemingly confirmed the existence of a second sex tape with Kim Kardashian, but he’s also said he never personally possessed a copy.

www.complex.com

May 4, 2022

# Sophie Turner Talks Expecting Second Baby With Joe Jonas: ‘It’s the Best Blessing Ever’

The star of "The Staircase" also said she was "gunning for Cardi B" to walk her down the aisle at her Vegas wedding.

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May 3, 2022

# PSY Embraces his ‘Second Chapter’ With New Album, Executive Role & Friendship With BTS

Nearly a decade after the breakout success of "Gangnam Style," the Korean rapper is galloping back with newfound wisdom, humility and artistic inspiration.

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May 2, 2022

# Guided by Voices Fatten Their Epic Setlists With Second Album of 2022

Tremblers and Goggles by Rank is out July 1 via frontman Robert Pollard's own Rockathon Records

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April 22, 2022

# YouTube’s ‘Coachella Curated’ Back For Second Weekend With Anitta, Harry Styles, The Weeknd

You can also drop in for sets from Finneas, Billie Eilish, Bishop Briggs, Danny Elfman and more.

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April 22, 2022

# Jack Harlow’s ‘First Class’ Flies High For Second Week on Australia’s Chart

The national albums chart is dominated by modern classics, as Dua Lipa’s "Future Nostalgia" returns to No. 1 for a third non-consecutive week.

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April 20, 2022

# Novelist Reunites with Billionaire Boys Club for Second High-Energy Tessuti Campaign

Luxury fashion retailer Tessuti has reunited UK rapper Novelist and Billionaire Boys Club for a second high-energy campaign that spotlights new SS22 pieces.

www.complex.com

April 18, 2022

# Harry Styles’ ‘As It Was’ Enters Second Week at No. 1 In U.K.

he former One Direction star enters a second week at No. 1 with “As It Was.”

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April 15, 2022

# Second Nature

Holly Laessig and Jess Wolfe are skilled harmonists and sought-after collaborators. Their latest album searches for its own identity in the neon haze of the dancefloor.

pitchfork.com

April 13, 2022

# ‘Girls5Eva’ Season 2 Trailer Has Ladies Shuffling Through Their ‘Riff Rolodex’ in Search of Second Hit

This time they hope someone has at least spell-checked the lyrics.

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April 12, 2022

# Lucius Dances Away the Sadness With ‘Next to Normal’ on ‘Ellen’

Song appears on the duo's recent album Second Nature

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April 11, 2022

# Conan Gray’s Second Album ‘Superache’ Is About That Pain That Lingers for Years

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April 7, 2022

# Paulo Londra Rules Billboard Argentina Hot 100 Chart for a Second Week With ‘Plan A’

Plus, J Balvin & Ed Sheeran’s “Sigue” bows at No. 57.

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April 5, 2022

# Five Burning Questions: Machine Gun Kelly Scores Second Straight No. 1 Album With ‘Mainstream Sellout’

'Sellout' becomes one of just a handful of rock LPs to top the Billboard 200 in the 2020s.

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April 2, 2022

# A-Trak releases EP created from fixed-up vintage sequencer

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April 1, 2022

# Fans React to Sixers Coach Doc Rivers Putting Second Unit Struggles on James Harden Following Pistons Loss

"It was more James than them," the Philadelphia 76ers head coach said in response to a comment about his team losing to the Detroit Pistons on Thursday.

www.complex.com

March 31, 2022

# Madonna Drops Second ‘Frozen’ Remix, Teaming With Rapper 070 Shake

Madonna continues to capitalize upon the recent viral success of a remix of “Frozen,” this time […]

www.rollingstone.com

March 30, 2022

# Fly Anakin’s ‘No Dough’ Is a 90-Second Tour Through All That Makes Him ‘One of the Illest MCs’

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March 29, 2022

# Gap and Dapper Dan Roll Out Second Drop of ‘DAP GAP’ Hoodies

The inaugural drop resulted in a swift sellout. Now, Gap and Dapper Dan are giving consumers a chance to buy the hoodie in a new selection of colorways.

www.complex.com

March 29, 2022

# TREASURE are working on a music video for their viral TikTok hit ‘DARARI’

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www.nme.com

March 29, 2022

# Pat McGrath Labs Debuts Second ‘Bridgerton’ Collaboration: How to Shop the Collection

Pat McGrath Labs x ‘Bridgerton’ II is a royal collection fit for a queen.

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March 24, 2022

# For King & Country Adds Second Top Christian Albums No. 1 With ‘What Are We Waiting For?’

Plus, Elevation Worship & Maverick City Music's "Jireh" crowns Gospel Airplay.

www.billboard.com