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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
A sundial consists of the dial plate marked out with hour lines, and a gnomon, the raised projection that casts the shadow. The inclined edge of the gnomon, called the style, produces the work edge of the shadow that it is used to tell the time.