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We extend our warmest congratulations to Guy Ottewell on his 90th birthday. He was born on July 4, 2026. This date marks a significant milestone for a man who has spent decades helping people understand the night sky. EarthSky wishes him a happy birthday as he completes another trip around the sun. Guy Ottewell is famous around the world for his beautiful astronomy charts. He is best known for his hand-illustrated yearly Astronomical Calendar. The 2026 edition will be the final year he publishes this calendar. Almost every astronomy educator knows his work. They use his calendar to teach students about the night sky and outer space. Millions of people have benefited from his unique perspective on the universe.
Ottewell’s Astronomical Calendar became very popular as a printed book. It was sold from 1974 to 2016. Thousands of sky lovers in more than 100 countries bought the book. It was a beloved resource for amateur astronomers and teachers. However, the publication took a break starting in 2017. It returned in 2023 in both printed and electronic formats. Now, in 2026, we mark the end of this long-running series. The 2026 calendar is the final installment. This marks the close of a chapter that has educated and inspired millions.
Guy Ottewell spent his early childhood in Warwickshire. This area is in the West Midlands of the United Kingdom. He grew up in Surrey during his adolescence. Surrey is located southeast of London. After school, he served in the army. His service took him to Libya. Afterward, he hitchhiked home from Libya. His journey took him through Greece, Yugoslavia, Venice, and Holland.
He said he did well in school. He earned a scholarship to Cambridge University. There, he studied many subjects. He learned Arabic, Persian, archaeology, and anthropology. During vacations, he traveled to many places. He went to Switzerland to work in a theater. He visited Morocco, Iran, and Afghanistan. He returned from Afghanistan via Central Asia and Finland. His first long-term job was at a school in Arab Jerusalem. He lived there with his late wife, Barbara.
Later, he worked at Manchester University and UCLA. He cataloged books in Middle Eastern languages for their libraries. While at Manchester University, he studied modern Hebrew. He traveled around Israel. He even lived in a kibbutz for a time. For two years, he taught at a Native American school. This school was on the Navajo reservation in Arizona. Camping during his travels inspired him to learn about the stars. However, it was at the Navajo school that he first used a telescope. He also collected Navajo star lore during this time.
His life continued to change. His wife was asked to start a Montessori school in Greenville, South Carolina. They moved there. At first, he wanted to study plants instead of astronomy. He grew 80 kinds of vegetables. He made botanical drawings of them. But Professor Bill Brantley from the Physics Department at Furman University had a different idea. He asked Ottewell to show the stars to students. This request led to a new project. Professor Brantley suggested an astronomical yearbook for the Physics Department. This idea later became the yearly Astronomical Calendar.
Ottewell had to teach himself new skills. He learned trigonometry and computer programming to create the charts. The early publishing name was the Astronomical Workshop. This name was used for the Calendar and other works. Later, he changed the name to Universal Workshop. He did this because he also published a book about human rights. He then added publications about history, fiction, and poetry. He was not an employee of the university. However, he had the use of storage space and an office. He used these to fulfill orders from customers.
In 2001, he moved to England. He moved with his wife, Tilly, who is a journalist. He continued to publish the Astronomical Calendar from there. His recent journeys have been exciting. He has seen solar eclipses in many places. These include Canada, Kenya, Java, Mexico, West Texas, India, Mongolia, the Caribbean, Turkey, and Australia. He went to Peru when Halley’s Comet was visible. He also took long bicycle rides in Italy, Turkey, Greece, and India.
Guy Ottewell’s artistic talents go beyond scientific illustrations. He is also a skilled artist in other areas. This is shown in his self-portrait. It demonstrates his creativity and attention to detail. His art complements his scientific work. It helps people connect with the beauty of the universe.
Ottewell writes blog posts on his website, Universal Workshop. In recent years, EarthSky.org has reprinted many of his posts. This allows more people to read his insights. You can also find his charts on EarthSky. They are available at least through the end of 2026. They are featured in our popular guide to the visible planets and night sky.
Deborah Byrd, the founder of EarthSky, described Guy’s contributions. She said:
Through his own efforts, unaffiliated with any large organization, Guy has conveyed astronomy to millions of people since 1974. That’s when he published the original edition of his yearly Astronomical Calendar. He has published it since then, and it has become one of the most beloved resources in astronomy.
His work has reached a wide audience. He did not rely on large institutions. He worked independently to share his knowledge.
John Jardine Goss shared his thoughts on Guy Ottewell. John is a former president of the Astronomical League. He said:
All his works – which include a number of topical, in-depth books and beautiful wall posters – have inspired curious skywatchers and amateur astronomers to see more, and to learn more while they pursue the fascinating field of astronomy.
John’s words highlight the impact of Guy’s visual materials. His posters and books help people learn more about space.
Alan Hale also spoke about Ottewell. Alan was a co-discoverer of Comet Hale-Bopp. He said:
In addition to his astronomical writings and publications, Guy Ottewell has also engaged in numerous humanitarian efforts, and these infuse his writings. In so doing he is not only providing informational and educational benefits to his readers but is also demonstrating that the solar system and the universe within which we live are part of the common heritage of humanity.
Alan noted that Guy’s humanitarian work influences his writing. This adds depth to his educational materials. It shows that science and human values are connected.
Joe Patterson, a professor of astronomy at Columbia University, summed up our feelings. He said:
There’s nobody in Ottewell’s class.
This statement reflects the high regard in which he is held. His work stands out in the field of astronomy education.
Guy Ottewell has been a longtime educator in astronomy. He turned 90 on July 4, 2026. He is best known for his beautiful astronomy charts. He created the hand-illustrated yearly Astronomical Calendar. This calendar has helped millions of people understand the night sky. His work has inspired generations of skywatchers. He has made astronomy accessible and enjoyable for many. We thank him for his dedication and his beautiful work. His legacy will continue to guide stargazers around the world.