The sheet depicts the Struve Geodetic Arc's elements in Latvia. This construction with other parts situated in Norway, Sweden, Finland, Russia, Estonia, Lithuania, Belarus, Moldova and Ukraine was built in the 19th century to establish the exact shape and size of the earth. In 2005, this complex was inscribed on the World heritage list. Love the sheet and cover.
Thanks Oleg Skleinov
Do feel free to add your thoughts, comments or suggestions
NOTE: Please click on the images for a larger view / closer look.