May 2

Astronomy Day (Spring)

Star Trails
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Star trails
Photography by Lincoln Harrison
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"Keep your eyes on the stars, and your feet on the ground."

~ Theodore Roosevelt

Are you an aspiring astrophotographer? A star trail is a type of photograph that uses long exposure times to capture the apparent motion of stars in the night sky due to Earth's rotation. A star-trail photograph shows individual stars as streaks across the image, with longer exposures yielding longer arcs. The Earth rotates full circle relative to the backdrop stars in a period of about 23 hours and 56 minutes. 🌌

Designed by Carol A.L. Martin, the tartan illustrates the long-exposure photography of stars as they appear to move across the sky, leaving colourful trails.


Amateur astronomy clubs, planetariums, science museums, and parks celebrate Astronomy Day twice a year — once in the spring and once in the fall. Astronomy Day dates back to 1973, when Doug Berger, then president of the Astronomical Association of Northern California, decided to take advantage of local resources to "bring astronomy to the people."


Today, more than 40 years later, the day is celebrated across the United States and Canada, as well as in many countries around the world. Click the star trails photo below, one of many from a spectacular series of photos by Lincoln Harrison to visit his gallery.

Officially registered tartan graphics on this site courtesy of The Scottish Tartans Authority.  Other tartans from talented tartan artists may also be featured.

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