Historical clue formulations

• Ensnare — 2025-11-20
• Astronomer's aid — 2018-08-08
• Guide to studying the night sky — 2017-06-11
• Chart of the heavens — 2016-12-25
• Collection of high lights? — 2016-09-24
• Navigational aid — 2011-12-25
• Astronomer's aid — 2010-06-08