TAU DAY – June 28, 2024

Tau Day falls on June 28th each year, celebrating the mathematical constant τ (tau) and its significance in mathematics and science. It is a day to honor and raise awareness about the benefits of using tau as a more intuitive circle constant than pi. Join the movement and embrace the beauty of tau in mathematical calculations and beyond!

tau day

When is Tau Day?

If you’ve ever wondered when Tau Day falls on the calendar, mark your calendars for June 28th, 2024! This unique holiday, celebrated by math enthusiasts and those who appreciate a good play on numbers, is a day dedicated to honoring the constant tau, which is approximately 6.28.

Tau Day falls on June 28th each year, as a clever nod to the value of tau, which is double the more commonly known pi. While Pi Day on March 14th (3.14) celebrates the well-known mathematical constant π, Tau Day brings attention to the benefits of using tau in mathematical calculations.

Celebrating Tau Day on June 28th allows for a fun twist on traditional mathematical celebrations. It offers a fresh perspective on the circle constant debate and encourages individuals to explore the advantages of utilizing tau in various mathematical equations.

On Tau Day, you can engage in activities that promote mathematical learning, such as hosting math-themed events, sharing fun facts about tau with friends and colleagues, or even baking circular treats to honor the mathematical significance of the day.

History of Tau Day

Tau Day, celebrated on June 28th each year, is a mathematical holiday that pays homage to the mathematical constant tau (τ), which is approximately 6.283185. This day stands as a counterpart to Pi Day, which celebrates the more commonly known mathematical constant π (pi). The origins of Tau Day can be traced back to the early 21st century and the advocacy of mathematician Michael Hartl.

Michael Hartl, an advocate for mathematical clarity and efficiency, argued that tau, which represents the ratio of a circle’s circumference to its radius (2π), is a more natural and intuitive constant to work with in many mathematical contexts than pi. He proposed celebrating Tau Day as a way to raise awareness about this alternative constant and promote its usage in mathematical education and research.

The choice of June 28th for Tau Day is significant because it corresponds to the date when the value of tau (2π) equals 6.283185, mirroring the significance of March 14th (3/14) for Pi Day. While Tau Day initially started as a niche observance among mathematicians and enthusiasts, it has gradually gained traction and recognition, evolving from a local observance to a globally celebrated event.

The cultural significance of Tau Day lies in its promotion of mathematical literacy and appreciation for the elegance and simplicity of mathematical concepts. It serves as an opportunity to engage in discussions about the beauty of mathematics and the role of constants like tau in various mathematical disciplines, including geometry, trigonometry, and calculus.


How to Celebrate Tau Day

Ready to make your Tau Day celebrations memorable? Discover fun ways individuals can mark the occasion, get inspired with creative ideas for businesses to join in the fun, and explore unique ways to incorporate tau into your festivities. Let’s make this Tau Day one to remember!

How Individuals Can Celebrate Tau Day

Ready to make Tau Day memorable? Get inspired with five creative ways to celebrate this occasion. From baking tau-shaped treats to hosting a math-themed game night, there are plenty of fun ways to mark the day. Let’s explore these exciting ideas together!

  • Organize a Tau-themed bake-off: Encourage participants to create circular treats inspired by the mathematical constant tau, such as tau-shaped cookies, cakes with tau symbols, or pies with twice the circumference.
  • Host a Tau Day trivia night: Test friends’ knowledge of mathematics with fun and challenging trivia questions related to tau, pi, and other mathematical concepts. Offer prizes for the most knowledgeable participants.
  • Create Tau Day art projects: Channel creativity into artwork inspired by the beauty of mathematics and the symbolism of tau. From geometric designs to abstract representations of mathematical concepts, the possibilities are endless.
  • Arrange a Tau Day community service event: Give back to the community by organizing a volunteer activity with a mathematical twist, such as tutoring sessions focused on geometry or hosting a math-themed educational workshop for children.
  • Attend or organize a Tau Day lecture or discussion: Engage in intellectual discourse by attending a lecture or panel discussion on topics related to tau, mathematical constants, and their significance in various fields. Alternatively, organize a virtual discussion group with friends or colleagues to explore these topics together.

How Businesses Can Celebrate Tau Day

Want to make Tau Day memorable for your business? Check out five innovative ways that can help you celebrate Tau Day in style, engage your employees, attract customers, and infuse your operations with holiday cheer. From creative events to themed promotions, these actionable strategies will help showcase your business’s festive spirit and make Tau Day a hit with everyone involved. Time to get those Tau-inspired ideas flowing!

  • Offer discounts or promotions on products related to circles: Capitalize on the mathematical theme of Tau Day by offering special discounts or promotions on products that are circular or relate to geometry, such as circular clothing items, home décor, or office supplies.
  • Host a Tau-themed office competition: Foster team spirit and creativity by organizing a workplace competition centered around tau-related challenges, such as solving mathematical puzzles, designing circular logos or graphics, or coming up with innovative uses for the mathematical constant tau within the company’s operations.
  • Launch a social media campaign: Generate buzz and attract attention to your business by launching a creative social media campaign centered around Tau Day. Encourage followers to share their favorite mathematical facts, photos of tau-inspired creations, or stories about how math has impacted their lives, using a designated hashtag to increase visibility and engagement.
  • Collaborate with local schools or educational institutions: Strengthen ties with the community and promote STEM education by partnering with local schools or educational institutions to host Tau Day-themed workshops, lectures, or activities for students. Offer resources, sponsorships, or volunteer opportunities to support these initiatives and showcase your commitment to promoting mathematical literacy.
  • Organize a Tau Day-themed event or webinar: Host a virtual or in-person event or webinar focused on topics related to mathematics, innovation, or technology, featuring guest speakers, panel discussions, or interactive workshops. Use this opportunity to highlight your company’s expertise in STEM fields, connect with industry professionals, and engage with customers and stakeholders in a meaningful way.

Social Media Post Ideas for Tau Day

Looking for creative ways to engage with your audience on Tau Day? Discover some fun social media post ideas for both individuals and businesses to use on this special occasion. Share your excitement for Tau Day with unique and engaging content that will captivate your followers’ attention. Get ready to showcase your love for math in a fun and interactive way!

Social Media Post Ideas for Individuals to Use on Tau Day

Want to make a splash on Tau Day? Here are five creative ways for you to leverage social media to celebrate this mathematical holiday. From sharing fun facts about Tau to hosting a virtual Tau-themed contest, these ideas will help you engage your audience and join the mathematical festivities online. Get ready to inspire, educate, and entertain your followers with these exciting Tau Day social media post ideas!

  • Share fascinating facts about tau: Educate your followers about the mathematical constant tau by sharing interesting facts, trivia, or historical anecdotes related to its significance in mathematics and science.
  • Create and share tau-inspired artwork or graphics: Showcase your creativity by designing and sharing original artwork, graphics, or illustrations inspired by tau and mathematical concepts. Use visually appealing images to capture attention and spark curiosity among your audience.
  • Participate in Tau Day challenges or hashtags: Join Tau Day challenges or use popular hashtags related to the holiday to increase visibility and engagement for your posts. Whether it’s sharing photos of tau-themed creations, solving mathematical puzzles, or participating in online discussions, embrace the opportunity to connect with like-minded individuals and communities.
  • Share personal reflections or stories about math and tau: Share personal anecdotes, reflections, or stories about your relationship with math and how concepts like tau have influenced your life or perspective. Authentic storytelling can resonate with your audience and foster meaningful connections around shared experiences and interests.
  • Promote Tau Day events or activities: Spread the word about Tau Day events, workshops, lectures, or celebrations happening in your area or online. Encourage participation and engagement by sharing event details, RSVP links, or promotional materials with your followers, helping to amplify the reach and impact of these initiatives.

Social Media Post Ideas for Businesses to Use on Tau Day

Looking to boost your business’s online presence on Tau Day? Here are five dynamic social media post ideas that will engage your audience and showcase your brand’s creativity. From sharing fun tau facts to hosting a tau-themed giveaway, these strategies will help you stand out on this special mathematical holiday. Get ready to captivate your followers and join in the celebration of Tau Day on June 28th!

  • Launch a tau-themed social media campaign: Develop a creative social media campaign centered around Tau Day, featuring visually engaging content, interactive posts, and captivating storytelling to increase brand awareness and engagement.
  • Share educational content about math and tau: Position your business as a thought leader in STEM education by sharing informative and engaging content about mathematics, including explanations of tau, historical insights, and practical applications in various industries.
  • Feature tau-related products or services: Showcase products or services that align with the theme of Tau Day, such as circular items, math-inspired merchandise, or special promotions tied to the mathematical constant tau. Use compelling visuals and persuasive messaging to entice followers and drive sales.
  • Host a tau-themed social media contest or giveaway: Boost engagement and generate excitement among your audience by hosting a social media contest or giveaway with tau-related prizes. Encourage participation by inviting followers to share their favorite mathematical facts, solve puzzles, or create tau-inspired content for a chance to win.
  • Collaborate with influencers or experts in mathematics: Partner with influencers, mathematicians, or experts in STEM fields to co-create content, host live sessions, or participate in Q&A sessions on social media platforms. Leverage their expertise and credibility to amplify your brand message and reach new audiences interested in mathematics and innovation.

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Hashtags to Use During Tau Day

When celebrating Tau Day, remember the power of hashtags in boosting your social media presence. Use engaging and relevant hashtags to connect with a wider audience and join the online conversation. Incorporate popular tags like #TauDay, #Mathematics, and #CelebrateMath to increase visibility and engagement on your posts.

  • #TauDayCelebration
  • #TauDay2024
  • #TauRocks
  • #TauVersusPi
  • #EmbraceTheTau
  • #MathIsFun
  • #TauOverPi
  • #TauLove
  • #TauNation
  • #JoinTheTauMovement

For the complete list of holidays to celebrate on social media in June, visit AngieGensler.com/June-Holidays.

Let’s explore some exciting holidays related to Tau Day! Each of these holidays offers a unique opportunity to celebrate and engage with your audience in creative ways. Get ready to infuse your business with fun and festive energy as you discover these special occasions.

  • Pi Day: Celebrated on March 14th (3/14), Pi Day honors the mathematical constant π (pi), often with activities, contests, and discussions about mathematics and its significance in our lives.
  • Fibonacci Day: Observed on November 23rd (11/23), Fibonacci Day celebrates the famous Fibonacci sequence, where each number is the sum of the two preceding ones, and its applications in mathematics, nature, and art.
  • Golden Ratio Day: Recognized on June 18th (6/18) or November 1st (11/1), Golden Ratio Day pays homage to the mathematical constant φ (phi), also known as the golden ratio, which appears in various natural and artistic contexts.
  • Mole Day: Held annually on October 23rd (10/23) from 6:02 am to 6:02 pm, Mole Day commemorates Avogadro’s number (6.02 x 10^23), a fundamental concept in chemistry, with educational activities and mole-themed festivities.
  • Euler’s Number Day: Celebrated on February 7th (2/7), Euler’s Number Day highlights the mathematical constant e, approximately equal to 2.71828, and its significance in calculus, exponential growth, and complex analysis.

For more holidays, download our free calendar with over 1,000 fun and unique holidays to celebrate this year. Head to angiegensler.com/holiday-calendar to grab your free copy.

Future Dates for Tau Day

As you look ahead to future Tau Days, consider the exciting lineup of dates awaiting you. The table provided will give you a clear overview of the upcoming Tau Days starting from 2024. Get ready to mark your calendars and celebrate this mathematical holiday each year with enthusiasm!

2024June 28Friday
2025June 28Saturday
2026June 28Sunday
2027June 28Tuesday
2028June 28Thursday
2029June 28Friday

Frequently Asked Questions

When it comes to Tau Day, you might have some burning questions on your mind. Let’s clear up some common queries that many people have about this unique celebration. Get ready to have your top FAQs answered right here.

What is Tau Day?

Tau Day, celebrated on June 28th, is a mathematical holiday dedicated to promoting awareness and appreciation for the constant tau (τ), which is approximately equal to 6.283185. It serves as a counterpart to Pi Day and emphasizes the importance of tau in various mathematical contexts.

Why is Tau Day celebrated on June 28th?

Tau Day is celebrated on June 28th because the value of tau (2π) equals approximately 6.283185, mirroring the significance of March 14th (3/14) for Pi Day. This date aligns with the mathematical theme of the holiday and provides a fitting occasion to recognize and celebrate the constant tau.

How can I celebrate Tau Day?

  • Organize tau-themed activities: Host mathematical puzzles, contests, or lectures centered around tau and its significance in mathematics.
  • Share tau-related content on social media: Educate others about tau by sharing interesting facts, graphics, or artwork on social media platforms using the hashtag #TauDay.
  • Participate in Tau Day events: Attend or organize Tau Day events, workshops, or community gatherings to connect with fellow mathematics enthusiasts and celebrate the beauty of math.


In conclusion, Tau Day stands as a testament to the beauty and significance of mathematics, offering a unique opportunity to celebrate the constant tau and its role in shaping our understanding of the world. From its origins as a grassroots movement to its growing recognition as a global phenomenon, Tau Day exemplifies the spirit of curiosity, innovation, and community that defines the mathematical community. As we commemorate this special day, let us not only reflect on the elegance of mathematical concepts but also embrace the spirit of exploration and discovery that Tau Day inspires. Whether through organizing events, sharing knowledge, or engaging in discussions, let us continue to champion mathematical literacy and foster a deeper appreciation for the wonders of mathematics in our lives.

Celebrate this special day with us, and don’t forget to download our free holiday calendar for more fun and unique holidays to celebrate this year.

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