Below is a small sampling of some Diversity Calendar 2025 events. To enjoy all 100+ events and educational tools, subscribe to our Diversity Calendar.
Need a Diversity Calendar for 2025? Get complete DEI and inclusion events, religious observances, awareness months 2025, and more
In 2025, the importance of diversity, equity, and inclusion continues to be a central theme in our global conversation. While we have made strides in creating more inclusive environments, there is always room for growth and improvement. A truly thriving society depends on recognizing and celebrating our differences.
Organizations are increasingly focused on developing DEI initiatives that ensure every employee feels valued and included. One effective tool to support these efforts is our Diversity Calendar, which highlights DEI holidays and significant cultural events throughout the year. This calendar serves as a reminder of the importance of inclusion in our daily lives and workplaces.
Below, you’ll find a sample of our diversity and inclusion calendar for 2025, featuring religious holidays, awareness months, and monthly diversity themes. This selection is designed to help you celebrate and integrate these important dates into your personal and professional life.
If a holiday begins the evening before, we will mark it with an asterisk (*) below.
January is a month to celebrate the diverse ways in which we communicate and connect with each other. From recognizing the importance of Braille for the visually impaired to honoring cultural and religious celebrations, this month is about understanding and appreciating the various forms of expression that enrich our world.
January 4 – UN: World Braille Day Celebrates the importance of Braille for the visually impaired.
January 7 – Coptic & Eastern Orthodox Christian: Christmas Marks the birth of Jesus Christ according to the Julian calendar.
January 14 – Buddhist: Mahayana New Year Celebrates the Buddhist New Year in Mahayana traditions.
January 20 – Martin Luther King Jr. Day Honors the civil rights leader and his contributions to equality.
January 27 – International Day of Commemoration in Memory of Victims of the Holocaust Remembers the victims of the Holocaust and promotes Holocaust education.
Learn more about January diversity days with our web-based DEI Calendar suite. Make sure to also check out our Heritage Months 2025highlights.
February is dedicated to celebrating Black History Month, a time to honor the contributions, achievements, and rich history of Black Americans. This month also includes significant events that promote harmony and awareness across various cultural and health-related spectrums.
February 1 – UN: World Interfaith Harmony Week Promotes harmony between all people regardless of their faith.
February 2 – Pagan and Wiccan: Imbolc Celebrates the beginning of spring and the goddess Brigid.
February 4 – World Cancer Day Raises awareness of cancer prevention, detection, and treatment.
February 17 – Washington’s Birthday (Presidents’ Day) Honors the birthday of George Washington, the first U.S. President.
February 26 – Hindu: Maha Shivaratri A major Hindu festival celebrating Lord Shiva.
March is dedicated to celebrating Women’s History Month, a time to recognize the contributions and achievements of women throughout history. This month also features important observances across different faiths and cultures, emphasizing the importance of equality and diversity.
April is dedicated to World Autism Month, raising awareness and promoting understanding and acceptance of people with autism. This month also includes diverse religious and cultural celebrations, highlighting the rich tapestry of global traditions.
May is Mental Health Awareness Month, a time to promote mental well-being and reduce the stigma surrounding mental health issues. This month also includes events that recognize diverse cultural, religious, and social contributions to our global community.
June is LGBTQ+ Pride Month, celebrating the diversity, history, and contributions of the LGBTQ+ community. This month also includes events emphasizing love, acceptance, and the importance of countering hate speech.
July is Disability Pride Month, celebrating the achievements and contributions of people with disabilities. This month also includes significant cultural and national observances that promote equality and inclusion.
August is Intersectionality Awareness Month, highlighting the interconnected nature of social categorizations such as race, class, and gender. This month features events that promote understanding and advocacy for diverse and intersecting identities.
September celebrates Hispanic Heritage Month, recognizing the contributions and influence of Hispanic Americans to the history, culture, and achievements of the United States. This month also includes observances that promote mental health, safety, and equality.
October is Breast Cancer Awareness Month, dedicated to raising awareness and promoting research for breast cancer. This month also features diverse cultural and religious events that foster inclusion and understanding.
November is Native American Heritage Month, celebrating the cultures, traditions, and histories of Native Americans. This month also includes observances that honor veterans and promote gender equality and remembrance.
Visit here to read more about November diversity days with our November Diversity Calendar 2025.
December Diversity Calendar 2025
December is Universal Human Rights Month, promoting the protection and advocacy of human rights for all. This month also includes diverse religious and cultural celebrations that encourage unity and peace.
Discover even more insightful and interesting diversity days that you can celebrate during December with our Diversity Calendar Suite. You can also explore more inclusion opportunities with our Interfaith Calendar 2025.
We hope you’ve found this Diversity Calendar 2025 Highlights useful in your quest for DEI and learning more about DEI holidays 2025. Try out the full Online Diversity Calendar for all 1,000+ DEI events, religious holidays, and observances.
Find out about the inspiring work of ancient Indian mathematician and astronomer, Brahmagupta.
By Lillie Therieau
While not much is known about the life of ancient Indian mathematician Brahamagupta, his contributions to math, astronomy, and science have shaped the modern world. He was one of the first mathematicians to explore the properties of the number zero, and the first to record his ideas about it in writing.
He’s also credited with important astronomical discoveries like the fact that the Moon is closer to Earth than the Sun. Remarkably, he set his complex math and science ideas out in a book composed entirely in metered poetic verse!
Learning about this extraordinary thinker, you’ll be shocked at the number of discoveries he made that inform our everyday lives. You’ll also get an underrepresented peek into the world of ancient Indian mathematicians and astronomers, whose prolific work put the ancient Greeks to shame.
The Mysterious Life of Brahmagupta
Unfortunately, not much is known about the details of Brahmagupta’s personal life. The only surviving records which describe him focus mainly on his mathematical and scientific contributions. However, we do know that Brahmagupta was born in 598 CE in Bhillamala, in the Gurjaradesa region of India. He was a Hindu, and a Shaivite specifically. Shaivism is still one of the largest denominations of Hinduism and adherents worship the god Shiva as the supreme ruler.
Bhillamala was the capital of the Gurjaradesa region and one of the biggest cities in India at the time. It was a beacon for academics throughout the region, attracting scientists and mathematicians in particular. Brahmagupta became an astronomer himself, studying from notable Indian astronomers and texts. He also studied the five traditional Siddhantas that dealt with astronomy.
A Siddhanta is a special concept in ancient Indian culture and refers to books setting out the highest, most settled, and respected views on any particular subject. Indian astronomy already had accumulated 6 Siddhantas by the time Brahmagupta began studying astronomy.
An ancient sundial
India was one of the first and most prolific ancient cultures to deal with the movements of the stars and planets. Ancient astronomers used rudimentary tools like a sun staff or the equivalent of a modern sundial to work out enormously complex equations that dictated the placement of celestial bodies.
At the age of 30, Brahmagupta finished his first treatise, the Brahmashuptasiddhanta. The name of his treatise translates to the “improved Brahma Siddhanta”. Many believe that it is a revised version of one of the Siddhantas that he would have studied as a younger student. His work introduced many new concepts and ideas, both relating to astronomy and pure mathematics. Plus--it was even in metered verse!
Bhramagupta moved to Ujjain near the end of his life, where he published his last major treatises, the Khandakhadyaka and the Grahanarkajnana at age 67. He was the head of the astronomical observatory in Ujjain, which became the most important city for Indian astronomers in Central India. He died a few years later.
A diagram of the Earth, Moon, and Sun
Brahmagupta’s Mathematical Work
Brahmagupta was primarily an astronomer, though much of his work in that field spilled into mathematics. For instance, he discovered that the Earth was closer to the Moon than the Sun. Brahmagupta deduced this from geometry, interpreting the angles of the light and shadows created by the Sun and how the Moon appeared to wax and wane. He also calculated the exact length of a year and the circumference of the Earth with surprising accuracy.
However, Brahmagupta’s most long-lasting discoveries were in algebra, number theory, and geometry. He introduced many groundbreaking algebraic ideas in his Brahmasphutasiddhanta, including the solution to the general linear equation and the general quadratic equation. The general linear equation solution to an equation like bx + c = dx + e, is one that we all learn early in our education. However, you probably didn’t know that you have Brahmagupta to thank!
He explained that an equation like bx + c = dx + e had to be solved by isolating the variables on one side of the equation. You simply subtracted the integers from one side and added them to the other, then did the same with the coefficient/variable pairs. Finally, you would divide both sides by the leftover coefficient. Any answer would be in the form of a=x, giving you a solution!
Brahmagupta was also the first mathematician to put fractions in the visual form that we think of today. In the Brahmasphutasiddhanta, he explains how to add, subtract, multiply, and divide fractions. Brahmagupta also demonstrates how to give the sum of squares and cubes of n integers. Both of these advances were very new in the field of arithmetic and inspired the students who came after him and studied his work.
In the field of geometry, Brahmagupta pioneered the aptly named Brahmagupta formula, which allows one to solve the area of a cyclic quadrilateral. He also worked through complex calculations in triangle geometry and solved for the value of Pi within a small margin of error.
A cyclic quadrilateral
Despite the many amazing accomplishments listed already, Brahmagupta is best remembered for his work defining the number zero. Zero had already been invented in Brahmagupta’s time, used as a placeholder for a base-10 number system by the Babylonians and as a symbol for a lack of quantity by the Romans. However, Brahmagupta reimagined the identity of zero: seeing it as a number on its own, rather than a simple symbol or placeholder.
He lays out the rules for arithmetic when using zero, although his rules for division differ from our understanding today. When Brahmagupta attempted to divide 0 by 0, he came to the sum of 0. However, most modern mathematicians would argue that 0 divided by 0 is undefined. Despite this outlier, the rest of Brahmagupta’s grasp on the number zero is exactly how we conceptualize it today.
Thanks to the continued prevalence of ancient Indian mathematicians, Brahmagupta’s ideas spread all over the world. Today, we use many of the rules that he developed in his treatises as fundamental building blocks for our mathematical understanding!
The Brilliant Lives of Famous Mathematicians
This article is the sixth in our series exploring the lives and achievements of famous mathematicians throughout history. (Our last article was about the Greek mathematician Pythagoras!)
Through the lives of these brilliant folks, we hope you’ll find connections, inspiration, and empowerment.
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