On Jónas Hallgrímsson's birthday, November 16, Icelandic Language Day is celebrated.

Jónas Hallgrímsson is best known for his poetry, natural science work, and not least his coining of new words.

In 1842, the book Astronomy, Light and for the People was published, which was Jónas Hallgrímsson's translation of the book by the Danish mathematician GF Ursin (1797-1849) Populært Foredrag over Astronomien . The book contains numerous new words by Jónas on various natural phenomena, such as gravity, ellipse, centrifugal force, speed of light, and many more.

The book can be viewed on the website of the National Library of Iceland – University Library, Bækur.is .

The National and University Library of Iceland maintains a website about the national poet Jónas at jonashallgrimsson.is .