Five o'clock doesn't end the workday
Virgo's nimble watchmaker mind ticks on

478.5 is the wavelength of blue
Corundum is the reason for sapphire
Virgo, earth bound builder of planes, land locked draftsman of ships

Mercury's mini eyed measurer explorers an atom with room to spare
Can survive within a fraction

A circle is perfect, but the world isn't round
Virgo can prove it