Possible Clues:

• Old city articles include one astronomy muse
• Astronomical Muse
• Woman on the US Naval Observatory's seal
• Astronomers' Muse
• Muse on the U.S. Naval Observatory's seal
• Muse for Sagan
• Muse often depicted with a celestial globe
• Muse often depicted holding a globe
• Muse invoked in 'Paradise Lost'
• The muse of astronomy and another name for Aphrodite