National Astronaut Day is celebrated annually on May 5th to honor astronauts and their contributions to space exploration. Founded by the Uniphi Space Agency, the day encourages people to learn about astronauts and their unique experiences in space. Typical customs include reading biographies of notable astronauts, such as Neil Armstrong and Sally Ride, and sharing fun facts about their lives and challenges, like the need for special garments during space missions. People often celebrate by watching films related to space travel, such as "Apollo 13" and "First Man," or by hosting themed parties that include space-themed snacks and music. The day serves as an opportunity to inspire young people to pursue interests in science and space exploration.